• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention provides a thin circularly polarized antenna that can reduce the practical use of parts. The two linearly polarized surface mounted antennas are mounted such that polarization planes perpendicular to the mounting surface are perpendicular to each other, and have an amplification circuit, a shielding case covering the amplification circuit, and the same amplitude and a phase difference of 90 ° to the two surface mount antennas. A phase circuit for sending signals is provided on the same mounting surface.
    公开号:KR19980081525A
    申请号:KR1019980013895
    申请日:1998-04-18
    公开日:1998-11-25
    发明作者:구시히유이치；시카타마사루
    申请人:무라따미치히로；가부시끼가이샤무라따세이사꾸쇼；
    IPC主号:
    专利说明:

    Circularly polarized antenna
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarized antenna, and more particularly, to a small and thin circularly polarized antenna such as an onboard GPS antenna and a radio navigation apparatus, and a wireless device using these circularly polarized antennas.
    Fig. 17 shows a conventional circular polarization antenna. This circularly polarized antenna is of a microstrip patch type.
    In Fig. 17, the circularly polarized antenna 100 includes a patch antenna 102 mounted on a mounting substrate 101, a second main surface of the mounting substrate 101, a shielding case 103 covering an amplification circuit (not shown) mounted on the first main surface of the mounting substrate 101; One end includes a cable 104 connected to the amplifying circuit. The patch antenna 102 is made of a dielectric substrate such as ceramic and resin. The ground electrode is formed on the entire first main surface of the patch antenna 102, and the nearly square radiation electrode 102a is formed on the second main surface. Between the center of the radiation electrode 102a and one corner, a through hole 102b is formed which penetrates the dielectric substrate and the mounting substrate 101 and is connected to the amplifier circuit mounted on the first main surface of the mounting substrate.
    18A and 18B show another conventional circularly polarized antenna. This is also a microstrip patch type. The same reference numerals as in Fig. 17 are used for the patch antenna. Fig. 18A is a perspective view of the circular polarization antenna seen from the second main surface of the mounting board, and Fig. 18B is a perspective view of the circular polarization antenna seen from the first main surface of the mounting substrate.
    In Fig. 18, the circularly polarized antenna 110 includes a mounting substrate 111, a patch antenna 102 mounted on a second main surface of the mounting substrate 111, a shielding case 112 covering an amplifier circuit mounted on a second main surface of the mounting substrate 111, and a mounting. A connecting electrode 113 penetrating the first main surface of the substrate 111 to connect the patch antenna 102 to the amplifying circuit; a shielding case 114 covering the connecting electrode 113 at the first main surface of the mounting substrate 111; and a cable 115 having one end connected to the amplifying circuit. It includes.
    Since the patch antenna 102 described above has a microstrip structure, the ground electrode is substantially formed over the entire mounting surface. Therefore, in order to connect the patch antenna 102 to the amplifier circuit, the patch antenna 102 must be connected through the first main surface of the mounting substrate 111. The shield case 114 is provided to shield the connecting electrode 113 and to suppress unwanted radiation.
    However, in the conventional circular polarization antenna 100 shown in Fig. 17, since the ground electrode is formed on the entire mounting surface of the dielectric substrate constituting the patch antenna 102, the amplifying circuit and the shield case 103 are provided on the first main surface of the mounting substrate 101. You must install it. Thus, the overall height of the circularly polarized antenna is increased. In addition, since the components are mounted on both surfaces of the mounting substrate 101, it is often used for mounting equipment.
    On the other hand, in the conventional circular polarization antenna 110 shown in Fig. 18, the amplifying circuit and the shield case 112 are mounted on the same surface of the mounting substrate 111 as the patch antenna 102. Even in this case, in order to form the connecting electrode 113 for connecting the patch antenna 102 and the amplifying circuit to the first main surface of the mounting substrate 111, the shielding case 114 covering the connecting electrode 113 on the first main surface of the mounting substrate 111 should be provided. . Therefore, it is difficult to reduce the height of the circularly polarized antenna as a whole, and it is difficult to save the actual equipment.
    In the conventional case shown in Fig. 18, a multilayer board can be used as the mounting board, and connection electrodes can be formed in the inner layer of the mounting board. In this case, however, the cost of the mounting board is further increased.
    Accordingly, it is an object of the present invention to provide a low cost, thin circular polarization antenna and a wireless device for practical use.
    1 is a perspective view of a circularly polarized antenna according to an embodiment of the present invention.
    FIG. 2 is an overall perspective view showing the structure of the surface mount antenna used in the embodiment of FIG.
    3 is an overall perspective view showing the structure of another surface-mounted antenna used as a circularly polarized antenna according to the present invention.
    FIG. 4 is a side view illustrating a current flowing to the ground terminal when there is only one ground terminal in the surface mounted antenna of FIG.
    FIG. 5 is a cross-sectional view illustrating an electric field generated at a radiation electrode of the surface mount antenna of the linearly polarized antenna of FIG.
    6 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    FIG. 7 is a cross-sectional view illustrating an electric field generated at a radiation electrode of the surface mount antenna of the linearly polarized antenna of FIG. 6.
    8 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    9 is an overall perspective view showing the structure of another surface mount antenna used as the circularly polarized antenna of the present invention.
    Fig. 10 is an overall perspective view showing the structure of another surface mount antenna used as the circularly polarized antenna of the present invention.
    11 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    12 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    13 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    14 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    15 is a perspective view of a circularly polarized antenna according to another embodiment of the present invention.
    Figure 16 is a block diagram illustrating an embodiment of a wireless device of the present invention.
    17 is a perspective view of a conventional circular polarization antenna.
    18A and 18B are perspective views of another conventional circular polarization antenna. Fig. 18A is a view seen from the second main surface of the mounting substrate, and Fig. 18B is a view seen from the first main surface.
    Explanation of symbols for the main parts of the drawings
    One … Circularly polarized antenna 2. Mounting board
    3, 4... Surface mount antenna 5.. Shielding case
    6. Phase circuits 6a and 6b. Microstrip Line
    7. cable
    The present invention, the mounting substrate; A pair of linearly polarized surface mounted antennas each having a polarization surface on the mounting substrate, the polarization surfaces perpendicular to the mounting surface of the mounting substrate being substantially orthogonal to each other; A phase circuit connected to the pair of linearly polarized surface mount antennas, for transmitting and receiving signals having the same amplitude and a phase difference of 90 ° to the surface mount antennas at least; An amplifier circuit connected to the phase circuit; And a shielding case covering the amplifying circuit, wherein the pair of linearly polarized surface mounted antennas, the phase circuit, the amplifying circuit and the shielding case are mounted on the same mounting surface of the mounting substrate. A circularly polarized antenna is provided.
    By the above-mentioned circularly polarized antenna, a thinned antenna is provided and the cost of mounting components is reduced.
    The circular polarization antenna further includes a radome covering the surface mount antennas, the phase circuit, the shield case, and the mounting substrate.
    In the above-mentioned circularly polarized antenna, each of the surface mount antennas has at least one feed electrode and radiation electrode, which is substantially rectangular in shape and is provided on at least one of the surface and the inside of the base member made of at least one of a dielectric material and a magnetic body. And a ground electrode.
    In the above-mentioned circularly polarized antenna, each of the surface mount antennas has one end of the ground electrode provided on a substantially first main surface of the base member, the other end serving as an open end and a connection end connected to the ground electrode. The radiation electrode having a second electrode is formed on the substantially second main surface of the base member, one end of the feed electrode is formed near the open end of the radiation electrode.
    In the above-mentioned circularly polarized antenna, the other end of the radiation electrode of each surface mounted antenna is divided into a plurality of ends, and the ends are connected to the ground electrode through the other surfaces of the base member to serve as ground ends.
    In the circular polarization antenna described above, the pair of surface mount antennas are disposed to be farthest from each ground terminal of the radiation electrode.
    In the above-mentioned circularly polarized antenna, in each of the surface mount antennas, an open end of the radiation electrode is formed inward from the corner of the second main surface of the base member at a second main surface of the base member.
    The circular polarization antenna described above further includes a shielding plate provided between the pair of surface mount antennas.
    Position the two surface mount antennas so that the distance between the ground terminals of the radiation electrode is farthest, or open the open ends of the radiation electrodes of the two surface mount antennas spaced at a predetermined distance from the corner of the second main surface of the base member. By forming a shielding plate between the two surface mount antennas or by providing a shielding plate between the two surface mount antennas in a position where the antennas are close to each other. to provide.
    The above-mentioned circular polarization antenna includes at least one capacitive element and inductive element whose phase circuit is connected to the pair of surface mount antennas.
    The present invention, the circular polarization antenna described above; A wireless device further includes a receiver and a signal processor connected in series to the circularly polarized antenna.
    The present invention further provides the use of the circularly polarized antenna for a wireless device.
    By the radio apparatus of the present invention, miniaturization, cost reduction, and the use of the circularly polarized antenna of the present invention reduce the practical use of the radio apparatus.
    Further features and effects of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings.
    1 is a circularly polarized antenna according to a first embodiment of the present invention. In FIG. 1, the circularly polarized antenna 1 includes the mounting board 2, the surface mount antennas 3 and 4 mounted on the second main surface of the mounting board 2, and the amplification circuit mounted on the second main surface of the mounting board 2 (not shown). A shielding case 5 for covering the circuit board, a phase circuit 6 for connecting the amplifier circuits to the surface mount antennas 3 and 4, and a cable 7 connected to the amplifier circuit at one end thereof. Nothing is mounted on the first main surface of the mounting board 2. The surface mount antennas 3 and 4 have the same structure as described below, and they are arranged such that their longitudinal directions are orthogonal to each other in order to orthogonalize their polarization planes in the normal direction with the mounting surface of the mounting substrate 2. The phase circuit 6 is formed of a microstrip line, one end of which is divided into a microstrip line 6a and a microstrip line 6b, and is connected to the surface mount antennas 3 and 4, respectively. Microstrip lines 6a and 6b are capacitive and inductive and act as capacitive and inductive elements. The length and width of the microstrip lines 6a and 6b are determined so that their impedances match the output side impedances of the surface mount antennas 3 and 4. Specifically, the microstrip line 6b is set longer than the microstrip line 6a.
    FIG. 2 shows the structure of surface mount antennas 3 and 4 used in the embodiment of FIG. The surface-mounted antenna 3 or 4 of Fig. 2 is a base member 10 made of a dielectric such as resin or ceramic, a ground electrode 11 formed on the first main surface of the base member 10, and has a length of about 1/4 wavelength of the resonance frequency. And a meander-shaped radiation electrode 12 formed on the second main surface of the member 10 and a feed electrode 13 extending from the first main surface of the base member 10 to the second main surface via one surface. One end of the radiation electrode 12 is arranged to face the power supply electrode 13 through the gap 14 while acting as the open end 12a, and the other end is connected to the ground electrode 11 via one end face of the base member 10 while serving as the ground end 12b.
    In the surface mount antennas 3 or 4 having the above-described configuration, when signals are input to the feed electrode 13, these signals are transmitted from the feed electrode 13 to the radiation electrode 12 through the gap 14. Since the radiation electrode 12 forms a stub of lambda / 4 having a ground end and an open end, it is resonated in accordance with the input signal. At this time, an electric field is generated between the radiation electrode 12 and the ground electrode 11, and part of the energy is leaked to the outside and radiated as radio waves. Radio waves are linearly polarized waves in which electric field directions coincide with the longitudinal direction of the base member 10 and are radiated in a direction substantially perpendicular to the longitudinal direction of the base member 10.
    Referring back to FIG. 1, the circularly polarized antenna 1 is configured as described above, and the two surface mount antennas 3 and 4 are arranged in the polarization planes of the radio wave in the normal direction of the mounting substrate 2 (in the electric field direction and the propagation direction). In order to orthogonal to each other, the longitudinal directions of these base members are arranged to be orthogonal to each other. On the other hand, the signal transmitted from the two surface mount antennas 3 and 4 to the amplifying circuit is displaced by 90 ° by the phase circuit 6. As a result, the circularly polarized antenna 1 acts as an antenna corresponding to the propagation of the circularly polarized wave.
    According to this configuration of the circularly polarized antenna 1, since the shielding case 5, the surface mount antennas 3, 4 and the phase circuit 6 covering the amplification circuit are mounted only on the second main surface of the mounting board 2, the use of the actual equipment of the component is reduced. It is possible to realize a thin antenna. In addition, since the phase circuit 6 is formed of a capacitive element and an inductive element such that the absolute values of these impedances match the absolute values of the output-side impedances of the surface mount antennas 3 and 4, the same amplitudes as the surface mount antennas 3 and 4 are obtained. A signal having a phase difference of 90 ° can be sent, and a match from the amplifier circuit to the surface mount antennas 3 and 4 can be obtained.
    In addition, in the circularly polarized antenna 1 of Fig. 1, since the radiation electrodes 12 of the two surface mount antennas 3 and 4 are set to a length of about λ / 4, the high frequency current flowing through the radiation electrodes 12 is maximum at the ground terminal 12b. do. The maximum high frequency current indicates that the magnetic field generated here is also maximum. In the two surface mount antennas 3 and 4, the ground end 12b is formed perpendicular to the first main surface of the base member 10 on one side of the base member 10, that is, perpendicular to the mounting substrate 2, so that the high frequency flows near the ground end 12b. The magnetic field generated by the current becomes parallel to the mounting substrate 2. Thus, when the ground terminals 12b of the two surface mount antennas 3 and 4, or the feed electrodes 13 formed on one side of the base member 10 that is the same as the ground terminal 12b and the ground terminal 12b are disposed in close proximity, they interfere with each other. It is a cause of deterioration of antenna characteristics, especially the axial ratio of circular polarization.
    Therefore, in the circular polarization antenna 1, two surface mount antennas 3 and 4 are arranged so that the open ends 12a of the radiation electrode 12 are close to each other and the ground ends 12b are farthest from each other. By this arrangement, mutual interference of the two surface mount antennas 3 and 4 can be reduced, and deterioration of the antenna characteristics of the circularly polarized antenna 1 can be prevented.
    Figure 3 shows the structure of another surface mount antenna used for the circularly polarized antenna according to the present invention. In Fig. 3, the surface mount antenna 90 has a base member 91 made of a dielectric such as resin or ceramic, a ground electrode 92 formed on the first main surface of the base member 91, and about 1 of the resonant frequency wavelength at the second main surface of the base member 91. A radiation electrode 93 and a feeding electrode 94 formed to a length of / 4. One end of the radiation electrode 93 extends to one side to form an open end 93a, and the other end is divided into three ground ends 93b, 93c, and 93d and connected to the ground electrode 92 via the other surfaces of the base member 91. One end of the feed electrode 94 is formed to face the open end 93a of the radiation electrode 93 on one side of the base member 91 via the gap 95, and the other end extends to the first main surface of the base member 91.
    In the surface mount antenna 90 having the above-described configuration, when a signal is input to the feed electrode 94, a signal is transmitted from the feed electrode 94 to the radiation electrode 93 through the gap 95. Since the radiation electrode 93 forms a stub of lambda / 4 having an open end and a ground end, it is resonated in accordance with the input signal. At this time, an electric field is generated between the radiation electrode 93 and the ground electrode 92, and part of the energy is leaked to the outside and radiated as radio waves. Radiation propagation is a linearly polarized wave in which the electric field direction coincides with the longitudinal direction of the base member 91 and is radiated in a direction substantially perpendicular to the longitudinal direction of the base member 91.
    Further, in the surface mount antenna 90, one end of the radiation electrode 93 is divided into three ground terminals 93b, 93c, and 93d, and is connected to the ground electrode 92 via different surfaces, respectively. This will be described below.
    When the surface mount antenna 90 has only the ground terminal 93b as the terminal of the radiation electrode 93 having no ground terminals 93c and 93d, all the current flowing to the terminal of the radiation electrode 93 is concentrated in the ground terminal 93b. 4 shows the amount of current flowing to the ground terminal 93b when only the ground terminal 93b serves as the terminal of the radiation electrode 93. FIG. In Fig. 4, the same reference numerals as used in Fig. 3 indicate the same or equivalent parts. As shown in Fig. 4, the current J flowing through the ground terminal 93b is concentrated in the portion close to the open terminal 93a in the ground terminal 93b due to their electromagnetic characteristics. Therefore, the current density at ground terminal 93b is very large, and antenna gain is reduced by conductor loss at the terminal. To solve this problem, the width of the ground terminal 93b can be extended. Even in this case, the characteristic that the current flowing in the region close to the open end 93a does not change, so that the open end 93a approaches the ground end 93b, resulting in a shorter substantial length of the radiation electrode 93, resulting in a higher resonance frequency. Also, the conductor loss cannot be reduced.
    However, when the ground terminal of the radiation electrode 93 is divided into three ground terminals 93b, 93c, and 93d, since the current flowing is dispersed, the amount of current flowing through each ground terminal is reduced. Since the current density decreases at ground, conductor losses are reduced and antenna gain is increased.
    Further, the ground terminal in the surface mounted antenna 90 of Fig. 3 is divided into three parts. However, for example, even when the end of the antenna is divided into only two ground terminals 93b and 93c formed on two surfaces facing each other except the ground terminal 93d, the same effect can be obtained.
    In the case of an antenna installed externally such as a GPS antenna among circularly polarized antennas, the entire antenna is covered with a radome for protecting the antenna. FIG. 5 is a cross-sectional view showing an electric field radiated from the radiation electrodes of the surface mounted antennas 3 or 4 when the circularly polarized antenna 1 is covered with a radome. Radom 8 is shown in FIG.
    As shown in Fig. 5, since the length of the radiation electrode 12 of the surface mount antenna 3 or 4 is set to about / 4, the electric field E1 radiated from the radiation electrode 12 of the surface mount antenna 3 or 4 is open to the radiation electrode 12. The maximum is at 12a. And the open end 12a is formed close to the end of the second main surface of the base member 10, and furthermore, the surface mounted antenna 3 or 4 is covered with the dielectric radome 8 having a predetermined permittivity for thinning the circularly polarized antenna. A portion of the electric field E1 radiated from the open end 12a substantially running toward the ground electrode 11 is attracted by the radome 8 and reaches a part away from the end of the base member 10.
    The fact that the electric field E1 radiated from the radiation electrode 12 reaches a portion away from the ends of the surface mount antennas 3 and 4 means that the possibility of the two surface mount antennas 3 and 4 interfering with each other increased by this field E1. do. This degrades antenna characteristics.
    Figure 6 shows another embodiment of the present invention. FIG. 6 shows a case where prevention of degradation of antenna characteristics due to an electric field radiated from an open end of the radiation electrode is considered. In Fig. 6, the same reference numerals used in Figs. 1 and 2 denote the same or equivalent parts, and their description is omitted.
    In Fig. 6, the open ends 12a of the radiation electrodes 12 of the two surface mount antennas 3x and 4x constituting the circularly polarized antenna 9 are formed at a predetermined distance d from the edge of the base member 10 inward.
    FIG. 7 is a cross-sectional view showing an electric field radiated from a radiation electrode of a surface mounted antenna 3x or 4x in a circularly polarized antenna. Since the open end 12a of the radiation electrode 12 in the surface mount antenna 3x or 4x is formed at a predetermined distance d inward from the edge of the base member 10, most of the electric field E2 radiated from the open end 12a is the ground electrode 11 Proceeding toward, the portion of the electric field E2 drawn by the radome 8 does not reach far from the end of the base member 10. As a result, the mutual interference between the two surface mount antennas 3 and 4 is reduced, and the antenna characteristics of the circularly polarized antenna 9 are protected. Moreover, since the antenna characteristics of the circularly polarized antenna 9 are not easily affected by the radome 8, the height of the radome 8 can be further reduced to produce a thin circularly polarized antenna.
    Figure 8 shows another embodiment of the present invention. 8 shows a case of preventing mutual interference of two surface mount antennas. In Fig. 8, the same reference numerals used in Fig. 1 denote the same or equivalent parts, and their description is omitted.
    In Fig. 8, the shield plate 16 insulated from the phase circuit 6 is placed between the two surface mount antennas 3 and 4 disposed on the mounting board 2 of the circular polarization antenna 15, i.e., above the phase circuit 6 in a portion where the antennas are arranged in close proximity. Is provided. The shield plate 16 is made of a conductor such as metal, and its end is insulated from and fixed to the insulating substrate 2, and is also grounded. Since the shield plate 16 is provided between the adjacent portions of the two surface mount antennas 3 and 4, the shield plate 16 prevents mutually radiated magnetic and electric fields from the adjacent portions of the two surface mount antennas. As a result, mutual interference between the two surface mount antennas 3 and 4 is prevented, and deterioration of the antenna characteristics of the circularly polarized antenna 15 is suppressed. As in the circular polarization antenna of FIG. 6, since the interference between the two circular polarization antennas does not increase even when the radome is provided, the height of the radome can be reduced, and a thin circular polarization antenna 15 can be manufactured.
    9 is another structure of the surface mount antenna for circular polarization antennas according to the present invention. In Fig. 9, the surface mount antenna 20 includes two base members 21 made of a dielectric such as resin or ceramic, a ground electrode 22 formed from one side of the base member 21 to the first main surface, and a second main surface of the base member 21. A second radiation electrode 23 formed in a curved U-shape and a second surface from the first main surface of the feed electrode 24 and the base member 21 extending from the first main surface of the base member 21 to the second main surface via one surface; And a ground electrode 25 formed up to the main surface. One end of the radiation electrode 23 is connected to the ground electrode 22, and the other end acts as an open end. One end of the ground electrode 25 is disposed to face the open end of the radiation electrode 23 through the gap 26. The feed electrode 24 corresponding to the open end of the radiation electrode 23 is disposed close to the ground electrode 22 at the open end of the radiation electrode 23.
    In the surface mount antenna 20 having the above-described structure, when a signal is input to the feed electrode 24, the signal is transmitted to the radiation electrode 23 through a capacitor 27 formed between the feed electrode 24 and the open end of the radiation electrode 23. . One end of the radiation electrode 23 is connected to the ground electrode 22, and the other end acts as an open end. By the capacitance of the open end and the ground electrode 25 and the induced capacitance of the radiation electrode itself, the radiation electrode 23 operates as an LC resonance circuit. An electric field is generated between the radiating electrode 23 and the ground electrode 25, and part of the energy is leaked to the outside and radiated as radio waves.
    10 shows another structure of the surface mount antenna for circular polarization antennas according to the present invention. In Fig. 10, the surface mount antenna 30 is provided with a base member 31 made of a dielectric such as resin or ceramic, a feed electrode 32 formed on one side of the base member 31, and a ground electrode 33 formed on both sides thereof. And a through hole 35 for connecting the radiation electrode 34 and the feed electrode 32 between the formed radiation electrode 34 and two opposing surfaces.
    The surface mount antenna 30 having the above-described configuration functions as a monopole antenna whose one end is opened by the feed electrode 32, the through hole 35 and the radiation electrode 34. As shown in FIG. Since the operation of the monopole antenna is well known, the description is omitted.
    The surface mount antennas of Figs. 9 and 10 are for linear polarization. The circularly polarized antenna formed of such an antenna has the same effect and effect as the embodiment of FIG. 1.
    In the surface mount antenna in the embodiment shown in Figs. 2 to 9, the radiation electrode has a tortuous shape and a U shape bent twice below. The electrodes may have another shape such as a straight line or an L shape. The base member of the surface mount antenna of the embodiment shown in Figs. 2 to 10 is made of a dielectric. These can be made of magnetic material.
    11 shows a circularly polarized antenna according to another embodiment of the present invention. In Fig. 11, the same reference numerals as those in Fig. 1 denote the same or equivalent parts, and their description is omitted.
    In Fig. 11, the phase circuit 41 of the circularly polarized antenna 40 has a surface mount capacitor 41a at the portion connected to the surface mount antenna 3, and an inductance formed by the microstrip line 41b at the portion connected to the surface mount antenna 4. The surface mount capacitor 41a and the microstrip line 41b act as capacitive elements each showing a capacitive function and inductive elements each showing an inductive function. Their capacitance, length and width are determined so that the signals applied to the surface mount antennas 3 and 4 have a phase difference of 90 degrees, and their impedances match the output side impedances of the surface mount antennas 3 and 4.
    12 illustrates a circularly polarized antenna according to another embodiment of the present invention. In Fig. 12, the same reference numerals as in Fig. 1 designate the same or equivalent parts, and their description is omitted.
    In Fig. 12, the phase circuit 51 of the circularly polarized antenna 50 includes a surface mount capacitor 51a at a portion connected to the surface mount antenna 3, and an air-core inductor 51b at a portion connected to the surface mount antenna 4; Has The surface mount capacitor 51a and the air core inductor 51b each function as a capacitive element exhibiting a capacitive function and an inductive element exhibiting an inductive function. Their capacitance and inductance are determined so that the signals applied to the surface mount antennas 3 and 4 have a phase difference of 90 degrees, and their impedances match the output side impedances of the surface mount antennas 3 and 4.
    13 illustrates a circularly polarized antenna according to another embodiment of the present invention. In Fig. 13, the same reference numerals as in Fig. 1 designate the same or equivalent parts, and their description is omitted.
    In Fig. 13, the phase circuit 61 of the circularly polarized antenna 60 has an inductance formed by the microstrip line 61b at the portion connected to the surface mount antenna 4, and the interdigital capacitor 61a at the portion connected to the surface mount antenna 3. The interdigital capacitor 61a and the microstrip line 61b act as capacitive elements each showing a capacitive function and inductive elements each showing an inductive function. Their capacitance, length and width are determined so that the signals applied to the surface mount antennas 3 and 4 have a phase difference of 90 degrees, and their impedances match the output side impedances of the surface mount antennas 3 and 4.
    14 shows a circularly polarized antenna according to another embodiment of the present invention. In Fig. 14, the same reference numerals as in Fig. 1 designate the same or equivalent parts, and their description is omitted.
    In Fig. 14, the phase circuit 71 of the circularly polarized antenna 70 has a surface mount capacitor 71a at a portion connected to the surface mount antenna 3, and a surface mount inductor 71b at a portion connected to the surface mount antenna 4. The surface mount capacitor 71a and the surface mount inductor 71b act as capacitive elements each showing a capacitive function and inductive elements each showing an inductive function. Their capacitance and inductance are determined so that the signals applied to the surface mount antennas 3 and 4 have a phase difference of 90 degrees, and their impedances match the output side impedances of the surface mount antennas 3 and 4.
    15 shows a circularly polarized antenna according to another embodiment of the present invention. In Fig. 15, the same reference numerals as those in Fig. 1 denote the same or equivalent parts, and their description is omitted.
    In Fig. 15, the phase circuit 81 of the circularly polarized antenna 80 is connected to the electrodes on the upper surface and inside of the multilayer mounting substrate 2 connected to the surface mount antenna 3 and connected to the microstrip line 81b connected to the surface mount antenna 4. It has a plate capacitor 81a formed by. The plate capacitor 81a and the microstrip line 81b act as capacitive elements each showing a capacitive function and inductive elements each showing an inductive function. Their capacitance, inductance, length and width are determined so that the signals applied to the surface mount antennas 3 and 4 have a phase difference of 90 ° and their impedances match the output side impedances of the surface mount antennas 3 and 4. .
    As described above, since the capacitor and the inductor are used as the capacitive element and the inductive element of the phase circuit, the circularly polarized antennas 40, 50, 60, 70, and 80 of the present invention have the same effect as the embodiment of FIG. Effect. By using chip components such as capacitive elements and inductive elements, the area for forming a phase circuit can be reduced by miniaturizing the circularly polarized antenna. In addition, since the capacitance and the inductance easily change using a chip component, the mounting substrate 2 can be easily used as a circularly polarized antenna having a different frequency.
    Fig. 16 shows a configuration of a navigation apparatus as an example of a radio apparatus using a circular polarization antenna of the present invention.
    In Fig. 16, the wireless device 110 includes an antenna 111 including the circular polarization antenna of the present invention having a radome, a receiving unit 112 connected to the antenna 111, a signal processing unit 113 connected to the receiving unit 112, and a mapping device 114. And a display 115 and an interface section 116 connected to the signal processor 113, respectively. The antenna 111 receives radio waves from a plurality of GPS satellites and extracts various kinds of signals from these radio waves at the receiver 112. In the signal processor 113, the current position of the wireless device, i.e., the mobile device having the wireless device, is calculated from the received signal. The map and current location are shown on the display 115 by the interface unit 116 with the mapping device 114 including the map software in the form of a CD-ROM and remote control.
    By constructing a navigation apparatus which is an example of a radio apparatus by using the circularly polarized antenna of the present invention described above, the degree of freedom of the place to place the antenna is increased by miniaturization, cost reduction, and further miniaturization of the radio apparatus itself. Therefore, for example, the cost of installing the navigation apparatus in the automobile can be reduced.
    In addition, although the circularly polarized antenna 1 is used in the wireless device 110, the same effect is obtained when the circularly polarized antennas 9, 15, 40, 50, 60, 70, and 80 of FIGS. 6, 8, and 11 to 15 are used. Can be obtained.
    As is apparent from the above, the present invention can provide a circularly polarized antenna and a wireless device using the same, which can reduce the use of thinner components and the actual equipment.
    While the invention has been described above with reference to specific embodiments, various forms without departing from the technical spirit of the invention are possible within the scope of the appended claims. Therefore, the scope of the present invention is limited only by the claims.
    权利要求:
    Claims (32)
    [1" claim-type="Currently amended] A mounting substrate;
    A pair of linearly polarized surface mounted antennas each having a polarization surface on the mounting substrate, the polarization surfaces perpendicular to the mounting surface of the mounting substrate being substantially orthogonal to each other;
    A phase circuit connected to said pair of linearly polarized surface mount antennas, for transmitting and receiving at least said signals having the same amplitude and a phase difference of 90 degrees to said surface mount antennas;
    An amplifier circuit connected to the phase circuit; And
    It includes a shielding case covering the amplification circuit,
    And said pair of linearly polarized surface mounted antennas, said phase circuit, said amplifying circuit and said shield case are mounted on the same mounting surface of said mounting substrate.
    [2" claim-type="Currently amended] The circularly polarized antenna according to claim 1, further comprising a radome covering the surface mount antennas, the phase circuit, the shield case, and the mounting substrate.
    [3" claim-type="Currently amended] The at least one feed electrode, the radiation electrode and the ground electrode of claim 1, wherein each of the surface mount antennas is provided in at least one of a surface and an interior of a base member which is substantially rectangular in shape and made of one of a dielectric material and a magnetic material. Circularly polarized antenna comprising a.
    [4" claim-type="Currently amended] 3. The at least one feed electrode, the radiation electrode and the ground electrode of claim 2, wherein each of the surface mount antennas is provided in at least one of a surface and an interior of a base member which is substantially rectangular in shape and made of one of a dielectric material and a magnetic material. Circularly polarized antenna comprising a.
    [5" claim-type="Currently amended] 4. The surface mount antenna according to claim 3, wherein each of the surface mount antennas has one end of the ground electrode provided on the substantially first main surface of the base member and serving as an open end and the other end acting as a connection end connected to the ground electrode. And a radiation electrode having a substantially second main surface of the base member, wherein one end of the feed electrode is formed near an open end of the radiation electrode.
    [6" claim-type="Currently amended] 5. The surface mount antenna according to claim 4, wherein each of the surface mount antennas has one end provided with the ground electrode on the substantially first main surface of the base member, the other end serving as an open end and the other end connected with the ground electrode. And a radiation electrode having a substantially second main surface of the base member, wherein one end of the feed electrode is formed near an open end of the radiation electrode.
    [7" claim-type="Currently amended] 6. The method of claim 5, wherein the other end of the radiation electrode of each surface mount antenna is divided into a plurality of ends, and the ends are connected to the ground electrode through other surfaces of the base member to act as a ground end. Circularly polarized antenna.
    [8" claim-type="Currently amended] 6. The circularly polarized antenna according to claim 5, wherein the pair of surface mount antennas are arranged farthest from each ground terminal of the radiation electrode.
    [9" claim-type="Currently amended] 8. The circularly polarized antenna according to claim 7, wherein the pair of surface mount antennas are disposed farthest between respective ground terminals of the radiation electrode.
    [10" claim-type="Currently amended] The method of claim 5, wherein in each surface mount antenna, an open end of the radiation electrode is formed inwardly at a predetermined interval from an edge of the second main surface of the base member on the second main surface of the base member. Circularly polarized antenna.
    [11" claim-type="Currently amended] The method of claim 7, wherein the open end of the radiation electrode in each of the surface-mounted antenna is formed in a predetermined interval from the corner of the second main surface of the base member on the second main surface of the base member. Circularly polarized antenna.
    [12" claim-type="Currently amended] The method of claim 8, wherein the open end of the radiation electrode in each of the surface-mount antennas are formed in a predetermined interval from the corner of the second main surface of the base member on the second main surface of the base member. Circularly polarized antenna.
    [13" claim-type="Currently amended] The circularly polarized antenna according to claim 1, further comprising a shielding plate provided between the pair of surface mount antennas.
    [14" claim-type="Currently amended] The circularly polarized antenna according to claim 1, wherein the phase circuit further comprises at least one capacitive element and an inductive element connected to the pair of surface mount antennas.
    [15" claim-type="Currently amended] (A) a mounting substrate;
    A pair of linearly polarized surface mounted antennas each having a polarization surface on the mounting substrate, the polarization surfaces perpendicular to the mounting surface of the mounting substrate being substantially orthogonal to each other;
    A phase circuit connected to said pair of linearly polarized surface mount antennas, for transmitting and receiving at least said signals having the same amplitude and a phase difference of 90 degrees to said surface mount antennas;
    An amplifier circuit connected to the phase circuit; And
    A shielding case covering the amplifying circuit;
    A circularly polarized antenna in which the pair of linearly polarized surface mounted antennas, the phase circuit, the amplifying circuit and the shielding case are mounted on the same mounting surface of the mounting substrate; And
    (B) a receiver and a signal processor connected in series to the circularly polarized antenna;
    Wireless device comprising a.
    [16" claim-type="Currently amended] 16. The wireless device of claim 15, wherein the wireless device further comprises a radome covering the surface mount antennas, the phase circuit, the shield case and the mounting substrate.
    [17" claim-type="Currently amended] 16. The at least one feed electrode, radiation electrode and ground of claim 15, wherein each of the surface mount antennas is substantially rectangular in shape and is provided in at least one of a surface and an interior of a base member made of one of a dielectric and a magnetic body. Wireless device comprising an electrode.
    [18" claim-type="Currently amended] 18. The ground terminal according to claim 17, wherein each of the surface mount antennas has a ground end disposed substantially on the first main surface of the base member and connected to the ground electrode and one end of the radiation electrode serving as an open end. And a second end surface of the base member having the other end acting as a second end, wherein one end of the feed electrode is formed near an open end of the radiation electrode.
    [19" claim-type="Currently amended] 19. The method of claim 18, wherein the other end of the radiation electrode of each surface mounted antenna is divided into a plurality of ends, and the ends are connected to the ground electrode through other surfaces of the base member to act as ground ends. Wireless device characterized in that.
    [20" claim-type="Currently amended] 19. The wireless device of claim 18, wherein the pair of surface mount antennas are disposed furthest apart from each ground terminal of the radiation electrode.
    [21" claim-type="Currently amended] 19. The method of claim 18, wherein in each surface mount antenna, an open end of the radiation electrode is formed inside at a predetermined interval from a corner of the second main surface of the base member on the second main surface of the base member. Wireless device.
    [22" claim-type="Currently amended] 16. The wireless device of claim 15 further comprising a shield plate provided between the pair of surface mount antennas.
    [23" claim-type="Currently amended] 16. The wireless device of claim 15 wherein the phase circuit further comprises at least one capacitive element and inductive element connected to the pair of surface mount antennas.
    [24" claim-type="Currently amended] A mounting substrate;
    A pair of linearly polarized surface mounted antennas each having a polarization surface on the mounting substrate, the polarization surfaces perpendicular to the mounting surface of the mounting substrate being substantially orthogonal to each other;
    A phase circuit connected to said pair of linearly polarized surface mount antennas, said phase circuit for transmitting and receiving at least a signal having the same amplitude and a phase difference of 90 degrees to said surface mount antenna;
    An amplifier circuit connected to the phase circuit; And
    A shielding case covering the amplifying circuit;
    Providing a circularly polarized antenna in which the pair of linearly polarized surface mounted antennas, the phase circuit, the amplifying circuit, and the shielding case are mounted on the same mounting surface of the mounting substrate;
    Connecting the circularly polarized antenna to a wireless device; And
    Receiving radio signals with the antenna and providing these signals to the wireless device; and
    Performing at least one of transmitting radio signals provided from the radio device to the antenna from the antenna;
    And at least one of wireless signal transmission and reception.
    [25" claim-type="Currently amended] 25. The method of claim 24, further comprising providing a radome covering the surface mounted antennas, the phase circuit, the shield case and the mounting substrate. At least one of receiving.
    [26" claim-type="Currently amended] 25. The method of claim 24, wherein the method further comprises: at least one feed electrode, each surface mount antenna, being substantially rectangular in shape and provided at at least one of the surface and inside of a base member made of one of a dielectric and a magnetic body, And providing each of the surface mount antennas comprising a radiation electrode and a ground electrode.
    [27" claim-type="Currently amended] 27. The method of claim 26, wherein in each of the surface mount antennas, the ground electrode is provided on a substantially first main surface of the base member, and the radiation electrode is connected to one end and the ground electrode serving as an open end. And having the other end acting as a ground end, formed on a substantially second main surface of the base member, and forming one end of the feed electrode so as to be provided near an open end of the radiation electrode. At least one of transmitting and receiving.
    [28" claim-type="Currently amended] 28. The method of claim 27, wherein the other end of the radiating electrode of each surface mounted antenna is divided into a plurality of ends, and the ends are connected to the ground electrode through other surfaces of the base member to be connected to a ground end. Providing at least one of: a radio signal transmission and reception.
    [29" claim-type="Currently amended] 28. The method of claim 27, wherein the method further comprises disposing the pair of surface mount antennas farthest apart between respective ground ends of the radiating electrode. How to do it.
    [30" claim-type="Currently amended] 28. The method of claim 27, wherein the open end of the radiation electrode of each of the surface mount antennas is formed inwardly from a corner of the second main surface of the base member at a second main surface of the base member. And performing at least one of wireless signal transmission and reception.
    [31" claim-type="Currently amended] 25. The method of claim 24, further comprising providing a shielding plate between the pair of surface mount antennas.
    [32" claim-type="Currently amended] 25. The method of claim 24, wherein the method further comprises forming the phase circuit having at least one capacitive element and an inductive element connected to the pair of surface mount antennas. And at least one of receiving.
    类似技术:
    公开号 | 公开日 | 专利标题
    JP4934784B2|2012-05-16|Antenna device and communication terminal device
    CN106058474B|2020-02-28|Antenna device and communication terminal device
    JP6256600B2|2018-01-10|Antenna device and electronic device
    JP3132664B2|2001-02-05|Microstrip antenna device
    JP3351363B2|2002-11-25|Surface mount antenna and communication device using the same
    US6476767B2|2002-11-05|Chip antenna element, antenna apparatus and communications apparatus comprising same
    US6614401B2|2003-09-02|Antenna-electrode structure and communication apparatus having the same
    EP1266425B1|2003-12-03|Multifrequency antenna for instrument with small volume
    US5764189A|1998-06-09|Doppler radar module
    JP3639767B2|2005-04-20|Surface mount antenna and communication device using the same
    US6995712B2|2006-02-07|Antenna element
    JP3186235B2|2001-07-11|Resonator antenna
    US6549167B1|2003-04-15|Patch antenna for generating circular polarization
    EP1102348B1|2003-03-05|Surface mounting antenna and communication apparatus using the same antenna
    JP4305282B2|2009-07-29|Antenna device
    EP0332139B1|1993-09-15|Wide band antenna for mobile communications
    KR100266376B1|2000-09-15|Surface mount type antenna and communication apparatus
    EP0814535B1|2003-07-09|Surface-mount antenna and a communication apparatus using the same
    US6456250B1|2002-09-24|Multi frequency-band antenna
    US6940458B2|2005-09-06|Electronic equipment and antenna mounting printed-circuit board
    JP3114582B2|2000-12-04|Surface mount antenna and communication device using the same
    US4916457A|1990-04-10|Printed-circuit crossed-slot antenna
    JP3630622B2|2005-03-16|Pattern antenna and wireless communication apparatus including the same
    US6853341B1|2005-02-08|Antenna means
    US4724443A|1988-02-09|Patch antenna with a strip line feed element
    同族专利:
    公开号 | 公开日
    EP0872912A3|1999-06-09|
    CN1155137C|2004-06-23|
    US6040806A|2000-03-21|
    DE69829431D1|2005-04-28|
    JPH11239020A|1999-08-31|
    CN1197309A|1998-10-28|
    DE69829431T2|2006-05-18|
    EP0872912A2|1998-10-21|
    EP0872912B1|2005-03-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-04-18|Priority to JP9-101658
    1997-04-18|Priority to JP10165897
    1997-12-19|Priority to JP35044497
    1997-12-19|Priority to JP9-350444
    1998-02-27|Priority to JP10-47332
    1998-02-27|Priority to JP4733298A
    1998-04-18|Application filed by 무라따미치히로, 가부시끼가이샤무라따세이사꾸쇼
    1998-11-25|Publication of KR19980081525A
    2001-09-06|Application granted
    2001-09-06|Publication of KR100301432B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP9-101658|1997-04-18|
    JP10165897|1997-04-18|
    JP35044497|1997-12-19|
    JP9-350444|1997-12-19|
    JP10-47332|1998-02-27|
    JP4733298A|JPH11239020A|1997-04-18|1998-02-27|Circular polarizing antenna and radio device using same|
    [返回顶部]