• 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 disclosure relates to a phase-stable radio frequency switch, comprising: a first directional coupler, a directional attenuator, a second directional coupler, an adjustable attenuator, an adjustable phase shifter and a microwave switch; wherein an input of the first directional coupler is connected with an input signal, an output of the first directional coupler is connected with an input of the directional attenuator, a coupling end of the first directional coupler is connected with an input of the adjustable attenuator, an output of the directional attenuator is connected with a coupling end of the second directional coupler, an output of the adjustable attenuator is connected with an input of the adjustable phase shifter, an output of the adjustable phase shifter is connected with an input of the microwave switch, and an output of the microwave switch is connected with an output of the second directional coupler. The radio frequency switch in the present disclosure may achieve the phase stability when the radio frequency signal is turned on, and is characterized by high isolation, fast switching and the like.
    公开号:NL2028301A
    申请号:NL2028301
    申请日:2021-05-27
    公开日:2021-12-14
    发明作者:Fan Sichen；Liu Dandan；Ruan Jun；Zhang Shougang
    申请人:Nat Time Service Ct Cas；
    IPC主号:
    专利说明:

    PHASE-STABLE RADIO FREQUENCY SWITCH
    TECHNICAL FIELD The present disclosure relates to the field of radio frequency switches, and particularly to a phase-stable radio frequency switch.
    BACKGROUND ART Radio frequency switch is a device capable of controlling the on and off of the radio frequency signal transmission path. It is characterized by fast response, high isolation and low insertion loss, and is widely used in radar, communication and other fields.
    In the prior art, typically, only one radio frequency switch is adopted to control microwave signal channel switching. However, when the signal is connected/disconnected, an ordinary radio frequency switch usually only controls the signal energy, and the signal phase fluctuates by 0 to 10mrad in a few seconds which affects the frequency mixing process of the system and the correlation process of the signal, resulting in that the system operates unstably within a few seconds of phase fluctuation, or even stops working completely. Therefore, it is necessary to provide a phase-stable RF switch to realize continuous phase stability.
    SUMMARY The present disclosure aims at providing a phase-stable radio frequency switch, which achieves the phase stability when the radio frequency signal is turned on, and is characterized by high isolation, fast switching and the like.
    In order to achieve the above purpose, the present disclosure provides the following scheme: A phase-stable radio frequency switch, including: A first directional coupler, a directional attenuator, a second directional coupler, an adjustable attenuator, an adjustable phase shifter and a microwave switch; Wherein an input of the first directional coupler is connected with an input signal, an output of the first directional coupler is connected with an input of the directional attenuator, a coupling end of the first directional coupler is connected with an input of the adjustable attenuator, an output of the directional attenuator is connected with a coupling end of the second directional coupler, an output of the adjustable attenuator is connected with an input of the adjustable phase shifter, an output of the adjustable phase shifter is connected with an input of the microwave switch, and an output of the microwave switch is connected with an output of the second directional coupler.
    Optionally, the microwave switch is of a PIN type.
    Optionally, the directional attenuator is a 6dB directional attenuator. According to embodiments provided in the present disclosure, the present disclosure discloses the following technical effects: In the radio frequency switch provided by the present disclosure, the first directional coupler, the directional attenuator, the second directional coupler, the adjustable attenuator, the adjustable phase shifter and the microwave switch are arranged so that a 200MHz signal is divided into two parts through the first directional coupler, wherein one part of the signal is output to the 6dB directional attenuator, and the other part is output to the adjustable phase shifter. After precise phase adjustment by the adjustable phase shifter, the adjustable attenuator is adjusted to achieve phase destructive interference, thereby achieving the phase stability when the radio frequency signal is turned on, and obtaining characteristics such as high isolation and fast switching.
    BRIEFT DESCRIPTION OF THE DRAWINGS In order to illustrate the embodiments of the present disclosure or technical schemes in the prior art more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skills in the art may obtain other drawings according to these drawings without creative work.
    Fig. 1 is a structure schematic view of a phase-stable radio frequency switch according to embodiments of the present disclosure; Fig. 2 is a schematic diagram of the turn-off ratio of a microwave radio frequency interference switch according to embodiments of the present disclosure; Fig. 3 is a schematic diagram of a phase transient effect of the radio frequency interference switch according to embodiments of the present disclosure; Fig. 4 is a schematic diagram of a phase transient effect of the radio frequency interference switch and a commercial microwave switch according to embodiments of the present disclosure.
    DETAILED DESCRIPTION OF THE EMBODIMENTS Technical schemes in the embodiments of the present disclosure will be described clearly and completely with reference to the accompanying drawings thereof. Apparently, the embodiments described herein are only part of, not all of, embodiments in the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skills in the art without creative work belong to the scope claimed by the present disclosure.
    The present disclosure aims at providing a phase-stable radio frequency switch, which achieves the phase stability when the radio frequency signal is turned on, and is characterized by high isolation, fast switching and the like.
    So that the above mentioned purposes, features and advantages of the present disclosure can be more apparently understood, the present disclosure will be further described with reference to figures and embodiments below.
    Fig. 1 is a structure schematic view of a phase-stable radio frequency switch according to embodiments of the present disclosure. As shown in the Fig. 1, the radio frequency includes: A first directional coupler 1, a directional attenuator 2, a second directional coupler 3, an adjustable attenuator 4, an adjustable phase shifter 5 and a microwave switch 6; An input of the first directional coupler is connected with an input signal, an output of the first directional coupler is connected with an input of the directional attenuator, a coupling end of the first directional coupler is also connected with an input of the adjustable attenuator, an output of the directional attenuator is connected with a coupling end of the second directional coupler, an output of the adjustable attenuator is connected with an input of the adjustable phase shifter, an output of the adjustable phase shifter is connected with an input of the microwave switch, and an output of the microwave switch is connected with an output of the second directional coupler.
    The radio frequency interference switch is designed according to an optical interferometer, which includes two arms, with one arm containing a 5 microwave switch of the PIN type and the other one propagating freely.
    If the interferometer is precisely adjusted to destructive interference, the output signal of the interferometer will be strongly attenuated when the switch is turned on, so that atoms will not interact with an excitation field propagating in the PIN microwave switch, and the phase of microwave signal interacting with the atoms will always be not affected.
    A 200MHz signal is divided into two parts through the first directional coupler, wherein one part of the signal is output to the 6dB directional attenuator, and the other part is output to the adjustable phase shifter.
    After precise phase adjustment by the adjustable phase shifter, the adjustable attenuator is adjusted to achieve phase destructive interference.
    The attenuation ratio can reach 58dB, as shown in Fig. 2 in detail.
    As shown in Fig. 3 and Fig. 4, it is observed that the previous fluctuation range disappears after the introduction of the radio frequency interference switch, indicating that the radio frequency interference switch does not cause any transient effect and discontinuity of the phase.
    However, at the moment that the switch is turned on, the phase experiences an exponential downward, as shown in Fig. 3 particularly, which is similar to that of the microwave interference switch developed by National Institute of Metrology, China.
    By improvement, the downward trend disappears, as shown in Fig. 4 where a small picture in Fig. 4 shows the amplified phase fluctuation of the interference switch.
    Since the radio frequency interference switch involves several devices introducing additional noises,
    the cumulative phase fluctuation reaches 10prad in five days.
    In this specification, various embodiments are described in a progressive manner, with each embodiment focusing on its differences from other embodiments, while cross reference would be enough for those same or similar parts between the embodiments.
    Principles and implementation of this present disclosure are described by specific examples, and the explanation of the above embodiments is only used to help understand the method and its core idea of the present disclosure.
    Also, those of ordinary skills in the art may take some modifications in the specific implementation and application scope according to the idea of the present disclosure.
    To sum up, the content of this specification should not be construed as limiting the present disclosure.
    权利要求:
    Claims (8)
    [1]
    A phase stable radio frequency switch, comprising: a first directional coupler, a directional attenuator, a second directional coupler, an adjustable attenuator, an adjustable phase shifter and a microwave radio frequency switch; wherein an input of the first directional coupler is connected to an input signal, an output of the first directional coupler is connected to an input of the directional attenuator, a coupling end of the first directional coupler is also connected to an input of the adjustable attenuator, a output of the directional attenuator is connected to a coupling end of the second directional coupler, an output of the adjustable attenuator is connected to an input of the adjustable phase shifter, an output of the adjustable phase shifter is connected to an input of the microwave radio frequency switch, and an output of the microwave radio frequency switch is connected to an output of the second directional coupler.
    [2]
    The phase stable radio frequency switch according to claim 1, wherein the microwave radio frequency switch is of a PIN type.
    [3]
    The phase stable radio frequency switch according to claim 1, wherein the directional attenuator is a 6dB directional attenuator.
    [4]
    The phase stable radio frequency switch of claim 1, wherein for the first directional coupling, an isolation amount is greater than or equal to 25dB, a coupling amount is 10dB, and an insertion loss is less than 0.9dB.
    [5]
    The phase stable radio frequency switch according to claim 1, wherein for the second directional coupling, an isolation amount is greater than or equal to 25dB, a coupling amount is 10dB, and an insertion loss is less than 0.9dB.
    [6]
    The phase stable radio frequency switch of claim 1, wherein the adjustable attenuator is adjustable in a range of 0 to 10dB.
    [7]
    The phase stable radio frequency switch according to claim 1, wherein the adjustable phase shifter has the parameters DC-18GHz and 540 degrees.
    [8]
    The phase stable radio frequency switch of claim 1, wherein the microwave radio frequency switch has an insertion loss less than or equal to 1dB and a degree of isolation greater than or equal to 50dB.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP3548882B2|1997-06-20|2004-07-28|オムロン株式会社|Phase modulation circuit|
    JPH1117464A|1997-06-26|1999-01-22|Hitachi Denshi Ltd|Phase shifter|
    JP2002171101A|2000-12-04|2002-06-14|Matsushita Electric Ind Co Ltd|Phase compensation gain control circuit, its regulating method, and radio communication device|
    CN101388649B|2008-10-13|2010-08-11|电子科技大学|Low non-linear power amplifier|
    CN106338658B|2016-08-25|2018-12-25|南京航空航天大学|The phase noise measurement method that is offseted based on radio frequency, device|
    CN109379145B|2018-11-27|2021-10-22|维沃移动通信有限公司|Signal processing circuit, terminal equipment and signal processing method|
    CN110275199B|2019-06-18|2020-09-01|中国科学院近代物理研究所|Resonance Schottky probe device and using method thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010482914.1A|CN111564679B|2020-06-01|2020-06-01|Radio frequency switch with stable phase|
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