Microstrip Spiral Antenna Having Two-Spiral Line

专利摘要:
PURPOSE: A micro strip spiral antenna is provided to allow the antenna to be used in a small mobile communication device by reducing the vertical volume of the antenna, while reducing manufacturing costs. CONSTITUTION: A micro strip spiral antenna comprises a dielectric substrate(21) having a predetermined dielectric constant and height(h); a grounding surface(22) formed on the dielectric substrate; a slot(23) formed at the center of the grounding surface; two spiral lines(24,25) having a symmetrical structure, and which are formed by the rotation of 180 degrees centering from the center point formed at the bottom of the dielectric substrate; a main feed line(28) having a power distributor arranged at the bottom surface of the dielectric substrate so as to feed power to the two spiral lines; and two feed lines(26,27) branched off from the main feed line and connected to the outer ends of the spiral lines, respectively.
公开号:KR20030036963A
申请号:KR1020010067916
申请日:2001-11-01
公开日:2003-05-12
发明作者:박익모；김명기；오대영
申请人:박익모；
IPC主号:

专利说明:

Microstrip Spiral Antenna Having Two-Spiral Line}
[24] The present invention relates to a microstrip spiral antenna having a circular slot in the ground plane, in particular two spiral lines for a specific frequency on the ground plane. Compensate for the asymmetry of the spiral antenna with one feed line by feeding it with a phase difference of, so that the main beam is radiated in a direction perpendicular to the antenna plane in a specific frequency range, or the two spiral lines are fed in phase so that the omni-directional coney of circular polarization It is to provide a microstrip spiral antenna using two spirals to emit a curl beam.
[25] Spiral antenna was built in 1954 by E.M. The frequency independent antenna proposed by Turner is a small structure, has broadband matching characteristics, and has the advantage of obtaining circular polarization. The spiral antenna is mainly used for the receiving end of an electronic support measurement (ESM), and is widely used as a military or commercial direction detection antenna.
[26] Since the spiral antenna has a symmetrical structure with respect to the spiral center, the spiral antenna has a main beam of circular polarization in a direction perpendicular to the spiral plane in all frequency domains. In a typical spiral antenna structure, an eccentric spiral antenna whose center is moved outwardly is inclined, although the main beam exhibits circular polarization, the direction of the main beam is not perpendicular to the antenna plane. Such a property may be useful when attached to a surface of a vehicle or a vehicle, and radiates circular polarizations in a vertical to a tilted direction with only a single device.
[27] In addition, a spiral antenna consisting of two spirals generally feeds vertically from the center of the antenna because it has to feed at the inner end of the spiral arm. However, in the vertical feeding method, even though the spiral element of the radiating element has a planar structure, the vertical volume increases due to the feeding structure, and there is also a difficult problem of designing a separate balloon for matching the feeding parts.
[28] In order to solve the above problems, a method of feeding a slot spiral located on the ground plane using a microstrip balloon, a method of using one rectangular slot spiral, and a spiral feeding a spiral with a straight microstrip line are supplied. There are many researches on antennas that can be implemented in a planar structure with the same characteristics as the existing spiral antennas such as a method of feeding and a method of feeding power from the outer arms of two spirals.
[29] The eccentric spiral antenna requires two spiral arms with the same center moved outward.
[30] However, there is a problem in that the planar structure of the eccentric spiral antenna is impossible because the eccentric effect cannot be obtained by the planar structure implementation method of the spiral antenna currently used.
[31] In order to solve the above problems, the applicant has implemented a microstrip spiral antenna having a circular slot in the ground in the patent application No. 2001-51821 filed August 27, 2001.
[32] The microstrip spiral antenna has a dielectric constant as shown in FIG. And a ground plane 12 formed on the top surface of the dielectric substrate 11 having a height h, and the ground plane 12 is etched to have a radius. It forms a circular slot 13 having a. After applying the conductive material to the entire lower surface of the dielectric substrate 11 having the ground plane 12 and the slot 13 as described above, the conductive material is etched by a method such as a photolithography method to spiral the lower portion of the slot 13. A line 14 and a straight line feed line 15 are formed. That is, it has a structure in which the ground plane 11 in which the slot 13 is formed in the upper part of the dielectric substrate 11, and the spiral line 14 and the linear feed line 15 in the lower part. The spiral line has an Archimedean spiral form as shown and is implemented by Equation 1.
[33]
[34] here Is the distance from the center of the spiral to the spiral arm, and the center of the spiral and the center of the circular slot located on the ground plane are the same. In addition, C is a constant that determines the rate of increase of the spiral and the distance d between the spiral arms and the line width of the feed line. Depends on the distance between the cancer and the center point. When the spiral makes one revolution ( It can be seen that increases by). Also, Is in It changes to realize spiral Is the starting position inside the spiral, and Is a variable representing the longitudinal position of the outermost arm of the spiral. here Is just a variable to implement a spiral and is a It has nothing to do with In the present invention in order to obtain the RHCP (right hand circular polarization) in the direction in which the slot is located The value of was set to increase while rotating clockwise.
[35] However, the antenna is advantageous when radiating in an aura direction like an eccentric spiral antenna, but there is a problem that the use band is limited when radiating in a vertical direction like a general antenna, and is used as a ground antenna in satellite communication. There was a problem that it is difficult to implement a conical beam.
[36] Therefore, in order to solve the above problems, the present invention forms two spiral lines on the ground plane, and the spiral lines have a specific frequency. It is intended to be fed with a phase difference of / 2 so that the main beam is directed in a direction perpendicular to the antenna in a specific frequency range.
[37] It is another object of the present invention to feed two spiral lines in phase on the ground plane to have a circularly polarized omnidirectional conical beam.
[38] In order to achieve the above object, the present invention provides a dielectric constant A dielectric substrate having a height of h, a ground plane formed on an upper surface of the dielectric substrate, and a radius formed at the center of the ground plane An in-slot, two spiral lines having a symmetrical structure formed by rotating the lens 180 degrees about the same center point as the slots on the bottom of the dielectric substrate, and a power distributor formed at one side of the bottom surface of the dielectric substrate to feed the two spiral lines And a microstrip spiral antenna using two spiral lines including a main feed line having two feed lines and two feed lines respectively distributed to the outer ends of each of the two spiral lines by a power divider in the main feed line. do.
[1] 1 is a perspective view showing the structure of a conventional microstrip spiral antenna having one spiral line.
[2] Figure 2a is a perspective view showing the structure of a microstrip spiral antenna using two spiral lines in accordance with the present invention.
[3] FIG. 2B is a plan view of the spiral line of FIG. 2A; FIG.
[4] 3 is an embodiment of the present invention. , , , Spiral line width 0.7mm, before passing through power distributor Line width 2.4mm of main feeder, So that the value is equal to the radius of the slot Value, d = 4.9mm, and the phase difference between the two feeders is based on 5.6GHz Dielectric constant of the dielectric substrate , thickness The slope of the main beam according to the frequency change of the microstrip spiral antenna using two spiral lines using the RT Duroid 5880 substrate.
[5] Fig. 4 is a graph showing the axial ratio in the direction perpendicular to the antenna plane of the antenna as in Fig. 3;
[6] 5 is a graph showing matching characteristics of an antenna as shown in FIG.
[7] Fig. 6 is a graph showing the half-power beamwidth and gain in the bandwidth of the antenna as in Fig. 3;
[8] 7A is a distribution diagram showing electric field distribution in a circular slot formed at 5.6 GHz by a conventional microstrip spiral antenna using one spiral;
[9] FIG. 7B is a distribution diagram showing electric field distribution in a circular slot formed by an antenna as shown in FIG. 3 at 5.6 GHz; FIG.
[10] FIG. 8 is a graph showing radiation patterns of xz-cut and yz-cut at 5.2 GHz of the antenna shown in FIG. 3; FIG.
[11] 9 is an embodiment of the present invention. , , , The distance between the tracks d = 5.6mm, Spiral line width 0.7mm, main feed line before passing through power distributor Formed with a line width of 2.4mm, two The feed line length of the same, and the dielectric constant of the dielectric substrate , thickness Graph showing the return loss of a microstrip spiral antenna using two spiral lines using the RT Duroid 5880 substrate.
[12] FIG. 10A is a graph showing an antenna radiation pattern formed at 5.2 GHz of the antenna of FIG. 9 by cutting perpendicular to a plane; FIG.
[13] FIG. 10B is a graph showing the antenna radiation pattern formed at 5.2 GHz of the antenna as shown in FIG. 9 by cutting parallel to the plane. FIG.
[14] Fig. 11 is a graph showing the axial ratio of the antenna as in Fig. 9;
[15] 12 is a graph showing the maximum radiation direction within the bandwidth of the antenna as shown in FIG.
[16] FIG. 13 is a graph showing the gain for RHCP within the bandwidth of the antenna as shown in FIG.
[17] <Description of the symbols for the main parts of the drawings>
[18] 10: microstrip spiral antenna
[19] 11,21: dielectric substrate 12,22: ground plane
[20] 13,23: circular slot 14: spiral line
[21] 24: first spiral line 25: second spiral line
[22] 26: first feeder 27: second feeder
[23] 28: Main wire
[39] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[40] Figure 2a shows a microstrip spiral antenna having two spiral lines according to the present invention, the dielectric constant And a ground plane 22 formed on the top surface of the dielectric substrate 21 having a height h, and the ground plane 22 is etched to have a radius. To form a circular slot 23 having a. As described above, after the conductive material is applied to the entire lower surface of the dielectric substrate 21 having the ground plane 22 and the slot 23, the conductive material is etched by a method such as a photolithography method to place the lower portion of the slot 23. The first spiral line 24 and the second spiral line 25 so as not to overlap each other at regular intervals, and distribute the first feed line 26 and the second feed line 27 and the feed lines connected to the spiral lines, respectively. A main feeder line 28 having a power divider is formed. That is, a ground plane 21 having a slot 23 formed on the top surface of the dielectric substrate 21, two spiral lines 24 and 25, two feed lines 26 and 27, and a main feed line 28 on the bottom surface thereof. It has a structure.
[41] The two spiral lines have an Archimedean spiral form as shown in FIG. 2B and are implemented by Equations 2 and 3.
[42]
[43]
[44] here ( ) Is the distance from the center point of the spiral line to the spiral line, and the center point of the spiral line and the center point of the circular slot located on the ground plane are the same. Also ( ) ( It is a symmetrical structure obtained by rotating it 180 ° about the center point of). Also, Is the distance between the inner starting point and the center of the spiral line. The increase rate of the spiral line is the spacing d between the lines and the line width of the spiral line when the spiral line is rotated once. Determined by The spacing d between the spiral lines is defined to be equal to the d value for one spiral line. That is, even if two spiral lines are used, d is the distance between the lines when one spiral line is rotated one time. Also Is in Will change to implement the spiral line Determines the inner starting position of the spiral line, Is a variable that determines the end position of the outermost line of the spiral line. In the present invention, to obtain the RHCP (Right Hand Circular Polarization) in the direction in which the circular slot is located The value was determined by increasing value while rotating clockwise.
[45] In addition, the main feed line is formed to have a 50Ω, the two feed lines divided through the power divider in the feed line is 100Ω to be connected to the outer end of each spiral line.
[46] The microstrip spiral antenna using the two spiral lines formed as described above allows the main beam to be radiated in a direction perpendicular to the plane of the antenna or is fed in phase to the two spiral lines according to the variable values used to implement the antenna. It is possible to emit a circularly polarized omnidirectional conical beam. The radius of the slot If is arbitrarily determined, the distance d between the lines and the spiral Wow The characteristics of the antenna are determined by such variables.
[47] First, an antenna for causing a main beam to be radiated in a direction perpendicular to the antenna plane in a specific frequency region, which is a first embodiment of a microstrip spiral antenna having two spiral lines according to the present invention. The antenna of the first embodiment , = 12mm, Fixed to 0.5mm, spiral wire width of 100Ω Is 0.7mm, and the line width of 50Ω main feeder wire is 2.4mm before passing through power divider. Also, the Value is the radius of the slot To be equal to Set the value and form d = 4.9mm. In addition, the phase difference between the two feeders before connecting to the spiral is based on 5.6 GHz Have / 2. In addition, a dielectric substrate having a ground plane on which slots are formed has a dielectric constant. RT Duroid 5880 substrate with a thickness of 2.2 and a thickness of h = 0.7874 mm is used.
[48] Since the microstrip spiral antenna having two spiral lines formed as described above has a slot structure, bidirectional radiation is performed, but the characteristics of the microstrip spiral antenna will be described in consideration of the main beam in the direction in which the circular slot is located.
[49] 3 shows the main beam direction according to the frequency change of the microstrip spiral antenna having the two spiral lines having the variable value of the first embodiment. In the case of the conventional microstrip spiral antenna using one spiral line, The value represents 7 ° and the main beam is tilted linearly with increasing frequency. However, the antenna of the first embodiment according to the present invention has a main beam direction. The value represents 0 ° from 5GHZ to 5.9GHz. That is, the phase difference between the feed lines It can be seen that the main beam is directed in a direction perpendicular to the antenna plane in the frequency range near 5.6 GHz designed with / 2.
[50] 4 shows the axial ratio with respect to the vertical direction of the microstrip spiral antenna having the two spiral lines of the first embodiment. The axial ratio start frequency of 3 dB or less is 4.75 GHz and once the axial ratio is lowered to 3 dB or less. In all areas, the ratio is kept below 2.2dB. Although it shows a low axial ratio in a wide section with respect to the vertical direction, it should be considered that the main beam is inclined toward the high frequency region as shown in FIG. 3.
[51] Next, FIG. 5 shows matching characteristics of a microstrip spiral antenna using two spiral lines according to the first embodiment. Phosphorus (Voltage Standing Wave Ratio) has matching characteristics. Although matched even in the frequency band of 4.5 GHz or less, the axial ratio condition of 3 dB or less is not satisfied.
[52] As described above, in the main beam direction The value represents 0 °, the axial ratio is 3dB or less, If the common frequency region satisfying the bandwidth is defined as the bandwidth, a partial bandwidth of 16.5% can be obtained in the 5GHz to 5.9GHz interval. The bandwidth is defined in consideration of the case where the main beam is perpendicular to the plane of the antenna. However, even if the beam is slightly inclined, the matching condition and the axial ratio condition are satisfied in a wide frequency range. In this case, it may be used in a wider frequency band.
[53] 6 shows the half-power beamwidth and the gain within the bandwidth of the microstrip spiral antenna using the two spiral lines of the first embodiment, and the half-power beamwidth is about 87 ° at 5 GHz, and gradually increases as the frequency increases. It tends to decrease. It has a wide beam width of more than 80 ° within the bandwidth, so it is suitable for use in a WLAN antenna. In addition, the antenna gain increases little by little as the frequency increases, with a relatively even value in the range of 3dBi.
[54] 7A shows the electric field distribution in a circular slot in a microstrip spiral antenna having a single spiral line in the related art, and the main beam is inclined because the electric field is distributed asymmetrically in the circular slot.
[55] However, since the electric field distribution in the circular slot of the microstrip spiral antenna having the two spiral lines of the first embodiment is symmetrical with respect to the center of the circle in the slot as shown in FIG. It can be seen that it is formed symmetrically with respect to the direction (z-axis) perpendicular to.
[56] 8 shows a radiation pattern calculated at 5.2 GHz in which the microstrip spiral antenna using the two spiral lines of the first embodiment is the center of the 5 GHz band of the Hyperlan, wherein the main beam is perpendicular to the antenna plane. It has an axial ratio of 1.93dB in the direction and RHCP appears in the direction of the circular slot. The circularly polarized 3dB beamwidth is 87 °, keeping the wide beamwidth.
[57] Since the microstrip spiral antenna using the two spiral lines of the first embodiment as described above uses two spirals, it is perpendicular to the plane of the antenna in a specific frequency band by compensating for the asymmetry of the antenna fed by one spiral line. A main beam of circular polarization facing in one direction can be obtained. Also, in the 5.6 GHz band Using two feed lines with a / 2 phase difference, when the line distance d is 7 times the line width (4.9 mm), a wide circular polarization bandwidth of 16.5% can be obtained.
[58] Also, for any frequency in the first resonant mode for a certain circular size If manufactured to have a / 2 phase difference, a beam directed in a vertical direction in the corresponding frequency region can be obtained.
[59] The microstrip spiral antenna using two spiral lines having the variable value of the above embodiment has a wide half-power beam width of 80 ° or more, and thus can be used as an antenna for a wireless LAN in the 5.15 GHz to 5.5.8 GHz band.
[60] Next, in the second embodiment, the two spiral lines of the microstrip spiral antenna having two spiral lines according to the present invention are fed in phase to emit an omnidirectional conical beam of circular polarization. , , = 23 mm, Spiral line width, fixed at = 0.5 mm, formed with a distance d = 5.6 mm between lines, and a line of 100 Ω Is 0.7mm, and the line width of 50Ω main feeder wire is 2.4mm until it passes through power divider. Also, by forming the same 100 Ω feed line length connected to the spiral, a second radiation mode of the spiral antenna can occur. In addition, a dielectric substrate having a ground plane on which slots are formed has a dielectric constant. RT Duroid 5880 substrate with a thickness of 2.2 and a thickness of h = 0.7874 mm is used.
[61] The microstrip spiral antenna having two spiral lines formed as in the second embodiment has the reflection loss as shown in FIG. That is, as shown, it can be seen that the matching characteristic is satisfied in all frequency bands after 4 GHz. It can be seen that the broadband matching characteristic of the spiral antenna is satisfied even in the antenna of the second embodiment. It stays below -15dB in all frequency ranges after 4.5GHz and has good return loss.
[62] 10A and 10B show a radiation pattern calculated at 5.2 GHz of the antenna of the second embodiment. Figure 10a shows a cut in a direction perpendicular to the antenna plane, it can be seen that the RHCP can be obtained in the direction in which the slot is located, the cross section appears symmetrically and the conical beam is radiated. The maximum radiation in the direction is 40 °. Figure 10b also shows The radiation pattern is fixed at 40 ° and is cut parallel to the antenna plane. The radiation pattern is almost the same in all directions. As described above, since the main beam is omnidirectional with respect to the antenna plane, the main beam is suitable for use as a terrestrial satellite antenna.
[63] 11 shows the axial ratio of the microstrip spiral antenna having two spiral lines of the second embodiment. Because the maximum radiation occurs at 40 ° in the direction and has an omni-directional beam Axial ratio is shown based on the maximum direction of. Frequency starts below 3dB, which is 5GHz. After that, it maintains a low ratio below 2.5dB in all frequency ranges except the 8GHz part. In the antenna, the electric field is affected by the characteristics of the circular slot because the electric field transitions from the spiral line to the circular slot and is radiated. As a result, the axial ratio below 3dB is not satisfied in all directions near 8GHz.
[64] Based on the above results, the main beam is omnidirectional in the direction parallel to the antenna plane, the axial ratio is kept below 3dB, and the frequency domain that satisfies the matching characteristic obtains a wide circular polarization bandwidth of about 33% from 5GHz to 7GHz. Can be.
[65] 12 shows that the antenna of the second embodiment is the maximum radiation within the bandwidth. Value of the direction, the difference of 4 ° appears depending on the frequency change. The maximum radiation occurs when the value is 40 °. Since the maximum direction to be radiated in this way is kept constant, it has omnidirectionality in the same direction.
[66] 13 shows gains for RHCP within the circularly polarized bandwidth of the antenna of the second embodiment. As shown in FIG. 13, gains of the antennas are increased little by little as the frequency is increased. Can be.
[67] As described above, the microstrip spiral antenna having the two spiral lines of the second embodiment has a feed line having the same length as that of the second embodiment in order to generate a conical beam with circular polarization. Not only were they fed in-phase simply by connecting them, but the antenna was implemented in a plane. In addition, a frequency band capable of obtaining a conical beam having omni-directionality in a direction parallel to the antenna plane can obtain a wide circular polarization bandwidth of approximately 33% in the 5GHz region. Therefore, the antenna can be used as a ground mobile communication antenna of satellite communication.
[68] As described above, the microstrip spiral antenna using the two spiral lines of the present invention can measure the length of the feed line connected to the two spiral lines. Formed to have a phase difference of / 2 and adjusting the value of each variable so that the main beam is radiated in a direction perpendicular to the antenna plane at a specific frequency band. The advantage is that it is possible.
[69] In addition, the microstrip spiral antenna using the two spiral lines of the present invention to form the same length of the feed line connected to the two spiral lines, adjust the respective variable values to form a spiral line and plan the two spiral lines It can be used as a ground mobile communication antenna in satellite communication by powering in phase and radiating an omnidirectional conical beam of circular polarization.
[70] In addition, the antenna applies a switch or phase shifter to the feeder to selectively change the length difference between the feeder to in-phase or in-phase, so that the beam perpendicular to the antenna plane and omni-directional conical within the same frequency. It can be used as a beam control antenna to obtain all the beams.
[71] All of the antennas described above are structured to form slots, spiral lines and feed lines using a dielectric substrate of thin thickness, and can be manufactured in a flat plane, thereby reducing the volume in the vertical direction, which is suitable for use in small mobile communication devices. As a result, the design is simple and can be mass-produced, thus reducing the manufacturing cost.

权利要求:
Claims (7)
[1" claim-type="Currently amended] Dielectric constant A dielectric substrate having a height of h;
A ground plane formed on an upper surface of the dielectric substrate;
Radius formed in the center of the ground plane Slots,
Two spiral lines having a symmetrical structure formed by rotating the substrate 180 degrees with respect to the center point of the bottom surface of the dielectric substrate;
A main feeder having a power divider formed at one side of a bottom surface of a dielectric substrate to feed the two spiral lines;
The microstrip spiral antenna using two spiral lines, characterized in that it comprises two feed lines which are distributed by the power distributor in the main feed line and connected to the outer ends of each of the two spiral lines.
[2" claim-type="Currently amended] The method of claim 1,
The two spiral lines have the form of an Archimedean spiral,
,

(here, , Is the distance from the center of each spiral line to the spiral arm, d is the spacing between the spiral arms, Is the line width of the feeder, The microstrip spiral antenna using two spiral lines is characterized by the size of each spiral line determined by the distance between the inner starting point and the center of the spiral line.
[3" claim-type="Currently amended] The method of claim 1,
The length of the feed line connected to each spiral line is for a specific frequency It is formed to have a phase difference of / 2 so that the main beam is radiated in a direction perpendicular to the antenna plane in a specific frequency band, the microstrip spiral antenna using two spiral lines.
[4" claim-type="Currently amended] The method of claim 3, wherein
The dielectric substrate has a dielectric constant having a ground plane in which slots are formed so that the main beam is radiated in a direction perpendicular to the antenna plane in the 5 GHz band. Spiral lines formed on the underside of the substrate using RT Duroid 5880 having a thickness of 2.2 and a thickness h of 0.7874 mm , = 12mm, Line width of feeder and spiral line of 100Ω with value of = 0.5mm Is 0.7mm, the line width of the 50Ω main feeder wire is 2.4mm before passing through the power distributor. Value is the radius of the slot To be equal to Value, and the phase difference between the two feed lines before connecting to the spiral line d = 4.9mm and connected to the spiral line is based on 5.6GHz. Microstrip spiral antenna using two spiral lines, characterized in that it is formed to have / 2.
[5" claim-type="Currently amended] The method of claim 1,
By using the two spiral lines characterized in that the same length of the feed line connected to each spiral line is formed so that the two spiral lines are fed in phase on the plane so that the omnidirectional conical beam of circular polarization is radiated. Microstrip Spiral Antenna.
[6" claim-type="Currently amended] The method of claim 5,
The antenna has a dielectric constant having a ground plane in which slots are formed to radiate circularly polarized omnidirectional conical beams in the 5 GHz band. = 2.2, thickness h = 0.7874 mm using RT Duroid 5880, the spiral line on the underside of the substrate , , = 23 mm, It has a value of = 0.5mm, and the distance between lines is d = 5.6mm, and the line width of feeder line and spiral line which is 100Ω line Is 0.7mm, the line width of the 50Ω main feeder wire is 2.4mm before passing through the power divider, and the microstrip spiral using two spiral lines is characterized by the same length of the 100Ω feeder line connected to each spiral line. antenna.
[7" claim-type="Currently amended] The method according to claim 3 or 5,
By adjusting the length of the feed line connected to the spiral line through a switch, it is possible to feed in the in-phase and anti-phase two spiral lines that can obtain both the beam perpendicular to the antenna plane and the omni-directional conical beam at the same frequency Microstrip spiral antenna for beam control using

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同族专利:

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公开号 | 公开日

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KR100468201B1|2005-01-26|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-11-01|Application filed by 박익모

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2001-11-01|Priority to KR20010067916A

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2003-05-12|Publication of KR20030036963A

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2005-01-26|Application granted

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2005-01-26|Publication of KR100468201B1

优先权:

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申请号 | 申请日 | 专利标题

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KR20010067916A|KR100468201B1|2001-11-01|2001-11-01|Microstrip Spiral Antenna Having Two-Spiral Line|