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WO2018120592A1 - Dual-frequency broadband feed network - Google Patents

Dual-frequency broadband feed network Download PDF

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Publication number
WO2018120592A1
WO2018120592A1 PCT/CN2017/084462 CN2017084462W WO2018120592A1 WO 2018120592 A1 WO2018120592 A1 WO 2018120592A1 CN 2017084462 W CN2017084462 W CN 2017084462W WO 2018120592 A1 WO2018120592 A1 WO 2018120592A1
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WO
WIPO (PCT)
Prior art keywords
dual
port
frequency coupler
feed network
coupler
Prior art date
Application number
PCT/CN2017/084462
Other languages
French (fr)
Chinese (zh)
Inventor
曲美君
邓力
李书芳
张贯京
葛新科
高伟明
张红治
Original Assignee
深圳市景程信息科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市景程信息科技有限公司 filed Critical 深圳市景程信息科技有限公司
Publication of WO2018120592A1 publication Critical patent/WO2018120592A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them

Definitions

  • the present invention relates to the field of satellite communication technologies, and in particular, to a dual-band broadband feed network.
  • the main object of the present invention is to provide a dual-band broadband feed network, which aims to solve the problem that the existing feed network is bulky, which is not conducive to the integration of the satellite antenna RF front end, and most of them work at a single frequency point, which is disadvantageous in Technical problems in working under multi-frequency or broadband conditions.
  • the present invention provides a dual-band broadband feed network including a coaxial connector, a first port, a second port, a third port, a fourth port, a first dual frequency coupler, and a second dual frequency coupler, wherein:
  • a signal line of the coaxial connector is connected to an input end of the first dual frequency coupler, and a ground line of the coaxial connector is connected to an input end of the second dual frequency coupler;
  • the through end of the first dual frequency coupler is connected to the input end of the first port, the coupling end of the first dual frequency coupler is connected to the input end of the second port, and the isolated end of the first dual frequency coupler is connected to First resistance [0007]
  • the through end of the second dual frequency coupler is connected to the input end of the fourth port, the coupling end of the second dual frequency coupler is connected to the input end of the third port, and the isolated end of the second dual frequency coupler is connected to Second resistance
  • the first dual frequency coupler and the second dual frequency coupler are each composed of twelve transmission lines, and each of the transmission lines has an electrical length of one quarter wavelength.
  • the impedances of the coaxial connector, the first port, the second port, the third port, and the fourth port are both 50 ⁇ .
  • the resistance values of the first resistor and the second resistor are both 50 ⁇ .
  • the first dual frequency coupler and the second dual frequency coupler respectively comprise four double branch impedance matching devices and one branch line coupler, and the four connection ends of the branch line coupler are correspondingly connected Up to four double-branch impedance matchers.
  • the double-branch section impedance matching device includes a transmission line Z1 and a transmission line ⁇ 2, and the transmission line Z1 is connected in series with the transmission line ⁇ 2.
  • the impedance of the transmission line Z1 is 85 ⁇
  • the impedance of the transmission line ⁇ 2 is 62 ⁇ .
  • the branch line coupler includes two transmission lines ⁇ 3 and two transmission lines ⁇ 4, and the transmission line ⁇
  • the impedance of the transmission line ⁇ 3 is 24 ⁇
  • the impedance of the transmission line ⁇ 4 is 33 ⁇ .
  • the dual-band broadband feed network of the present invention adopts the above technical solution, and achieves the following technical effects: using two coaxial couplers of signal lines and ground lines of a coaxial connector Feed, achieve 90° phase shift between adjacent ports of the four output ports.
  • the miniaturization of the feed network is achieved by rationally arranging the couplers.
  • the impedance matching of the dual-frequency coupler can be adjusted to achieve dual-frequency characteristics. If the two frequencies are close together, broadband characteristics can be achieved.
  • FIG. 1 is a schematic diagram showing the circuit structure of a preferred embodiment of a dual-band broadband feed network according to the present invention
  • FIG. 2 is a schematic diagram of S-parameter simulation results of the dual-band broadband feed network of the present invention
  • FIG. 3 is a schematic diagram showing phase difference simulation results of the dual-band broadband feed network of the present invention.
  • FIG. 1 is a schematic diagram showing the circuit structure of a preferred embodiment of a dual-band broadband feed network according to the present invention.
  • the dual-band broadband feed network is integrated on the PCB, and includes a coaxial connector P0, a first port P1, a second port P2, a third port P3, a fourth port P4, and a first Dual frequency coupler 1 and second dual frequency coupler 2.
  • the coaxial connector P0 is a coaxial connector having an impedance value of 50 ⁇ (ohms) as a coaxial feeding portion of a circularly polarized antenna or an array antenna.
  • the signal line of the coaxial connector P0 is connected to the input terminal of the first dual frequency coupler 1, and the ground of the coaxial connector P0 is connected to the input terminal of the second dual frequency coupler 2.
  • the through end of the first dual frequency coupler 1 is connected to the first port P1, the coupling end of the first dual frequency coupler 1 is connected to the second port P2, and the isolated end of the first dual frequency coupler 1 is connected to the first Resistance Rl.
  • the through end of the second dual frequency coupler 2 is connected to the fourth port P4, the coupling end of the second dual frequency coupler 2 is connected to the third port P3, and the isolated end of the second dual frequency coupler 2 is connected to the second resistor R2.
  • the resistance values of the first resistor R1 and the second resistor R2 are each preferably 50 ⁇ , the coaxial connector ⁇ 0, the coaxial connector ⁇ 0, the first port ⁇ 1, the second port ⁇ 2, the third port ⁇ 3, and the
  • the impedance of the four port ⁇ 4 is preferably 50 ⁇ .
  • the first dual frequency coupler 1 and the second dual frequency coupler 2 each include four double branch impedance matching devices 11 and one branch line coupler 12, and four connection ends of the branch line coupler 12 Correspondingly connected to the four double-branch section impedance matching unit 11, that is, one coupling end of the branch line coupler 12 is connected to a double-branch section impedance matching unit 11.
  • Each of the double-branch impedance matching devices 11 includes a transmission line Z1 and a transmission line ⁇ 2, wherein the transmission line Z1 is connected in series with the transmission line ⁇ 2.
  • the branch line coupler 12 includes two transmission lines ⁇ 3 and two transmission lines ⁇ 4, and the two transmission lines ⁇ 3 and the two transmission lines ⁇ 4 are alternately connected in series to form a ring structure.
  • the impedance of the transmission line Z1 is preferably 85 ⁇
  • the impedance of the transmission line ⁇ 2 is preferably 62 ⁇
  • the impedance of the transmission line ⁇ 3 is preferably 24 ⁇
  • the impedance of the transmission line ⁇ 4 is preferably 33 ⁇ .
  • the transmission line Z1, the transmission line ⁇ 2, and the transmission line ⁇ 3 Other suitable impedance values can also be used for the impedance of the transmission line Z4.
  • the first dual frequency coupler 1 and the second dual frequency coupler 2 are each composed of twelve transmission lines, and each of the transmission lines has an electrical length of 1/4 wavelength, that is, a transmission line.
  • the electrical lengths of Z1, transmission line Z2, transmission line Z3, and transmission line Z4 are both 1/4 wavelength.
  • the four coupling ends of the branch line coupler 12 are connected to four double-branch section impedance matchers 11, and impedance transformation can be achieved at two frequencies.
  • the first dual frequency coupler 1 and the second dual frequency coupler 2 achieve dual frequency characteristics if the two frequencies are closely spaced (eg, less than 200 MHz) ), the first dual frequency coupler 1 and the second dual frequency coupler 2 achieve wideband characteristics.
  • the coaxial feed signal line of the coaxial connector P0 (assuming a phase shift of 0° signal) is connected to the first dual-frequency coupler 1, and the phase shift of the signal of 90° can be realized. That is, the coaxial connector P0 outputs 0° signal phase shift, the second port P2 outputs -90° signal phase shift, and the coaxial connector P0 coaxially feeds the ground line, which is equivalent to -180° Signal phase shifting.
  • the signal phase shift of 90° can also be realized, that is, the signal phase shift of the third port P3 output -180°, port P5 Output -270° signal phase shift. Therefore, the dual-band wideband feed network can sequentially output equal-amplitude signals of 0°, -90°, -1 80°, and -270°.
  • FIG. 2 is a schematic diagram of S-parameter simulation results of the dual-band broadband feed network of the present invention. It can be seen from Figure 2 that the reflection coefficient IS00I of the coaxial connector P0 is below -10dB in the range of 1.75GHz to 2.35GHz, indicating that the relative bandwidth of the dual-band broadband feed network can reach 39%, realizing the dual-band broadband feed. Broadband characteristics of electrical networks.
  • the signal energy obtained with respect to the four output ports of the coaxial connector P0 (such as I S10l, IS20I, IS30I, IS40I in FIG. 2) is around -6 dB, the signal energy can be approximated from the coaxial connector P0.
  • the quarters are equally distributed to the four outputs, i.e., signal energy can be equally distributed from the coaxial connector P0 to the first port P1, the second port P2, the third port P3, and the fourth port P4.
  • FIG. 3 is a schematic diagram showing phase difference simulation results of the dual-band broadband feed network of the present invention.
  • the phase difference between adjacent ports of the dual-band broadband feed network is basically stable near the phase shift of 90°, which indicates that there is excellent phase shift between the four outputs of the dual-band wideband feed network. effect.
  • the signal energy between the four ports (the first port P1, the second port P2, the third port P3, and the fourth port P4) is equal amplitude, the phases are phase-shifted by 90°, so the Dual-band broadband feed networks can be widely used in the feeding of circularly polarized antennas, such as circularly polarized antenna arrays or four-armed helical antennas. Used in RF devices that require a four-point effect in the RF field.
  • the dual-band broadband feed network proposed by the present invention feeds two dual-frequency couplers by using a signal line and a ground line of a coaxial connector P0, at four output ports (ports P1, P2, P3, and P4). A phase shift of 90° is achieved between adjacent ports.
  • the miniaturization of the feed network is realized by rationally arranging the dual-frequency coupler.
  • Another advantage of the dual-band wideband feed network of the present invention is that dual-frequency characteristics are achieved by impedance matching of the dual-frequency coupler. If the two frequencies are relatively close, broadband characteristics can be achieved.
  • the dual-band broadband feed network of the present invention adopts the above technical solution, and achieves the following technical effects: using two coaxial couplers of signal lines and ground lines of a coaxial connector Feed, achieve 90° phase shift between adjacent ports of the four output ports.
  • the miniaturization of the feed network is achieved by rationally arranging the couplers.
  • the impedance matching of the dual-frequency coupler can be adjusted to achieve dual-frequency characteristics. If the two frequencies are close together, broadband characteristics can be achieved.

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Abstract

Disclosed is a dual-frequency broadband feed network, comprising a coaxial connector, a first port, a second port, a third port, a fourth port, a first dual-frequency coupler, and a second dual-frequency coupler. A signal line of the coaxial connector is connected to an input end of the first dual-frequency coupler. A ground wire of the coaxial connector is connected to an input end of the second dual-frequency coupler. A straight-through end of the first dual-frequency coupler is connected to an input end of the first port. A coupling end of the first dual-frequency coupler is connected to an input end of the second port. An isolation end of the first dual-frequency coupler is connected to a first resistor. A straight-through end of the second dual-frequency coupler is connected to an input end of the fourth port. A coupling end of the second dual-frequency coupler is connected to an input end of the third port. An isolation end of the second dual-frequency coupler is connected to a second resistor. According to the present invention, a feed network can be miniaturized, a phase shift of 90° can be implemented between adjacent ports in the four output ports, and both the dual-frequency characteristic and the broadband characteristic of the feed network can be achieved.

Description

双频宽带馈电网络  Dual-band broadband feed network
技术领域  Technical field
[0001] 本发明涉及卫星通信技术领域， 尤其涉及一种双频宽带馈电网络。  [0001] The present invention relates to the field of satellite communication technologies, and in particular, to a dual-band broadband feed network.
背景技术  Background technique
[0002] 近年来， 随着卫星导航、 卫星通信的快速发展和广泛应用， 圆极化天线或阵列 天线作为这些系统的前端设备， 其性能指标的优劣， 对于卫星通信手持终端和 射频识别读卡设备的性能起着极其重要的作用。 另外， 为了便于卫星通信终端 和射频识别系统的大规模推广应用， 系统的经济成本和体积大小都是至关重要 的考虑因素， 作为其中重要部件的圆极化天线， 在保证较高性能指标的前提下 ， 必须具备成本低廉、 结构紧凑和体积小巧的特点。 在对圆极化天线或阵列天 线进行馈电吋， 需要对馈电网络进行设计。 由于现在的通信系统都需要多频化 、 宽带化、 小型化。 而现有的馈电网络体积庞大， 不利于卫星天线射频前端的 集成。 而且大多工作在单一频点， 不利于在多频或宽带条件下工作。  [0002] In recent years, with the rapid development and wide application of satellite navigation and satellite communication, circularly polarized antennas or array antennas are used as front-end devices of these systems, and their performance indicators are good and bad for satellite communication handheld terminals and radio frequency identification reading. The performance of the card device plays an extremely important role. In addition, in order to facilitate the large-scale popularization and application of satellite communication terminals and radio frequency identification systems, the economic cost and size of the system are all important considerations. As a key component of the circularly polarized antenna, the higher performance index is guaranteed. Under the premise, it must have the characteristics of low cost, compact structure and small size. In the case of feeding a circularly polarized antenna or an array antenna, the feed network needs to be designed. Since today's communication systems require multi-frequency, wideband, and miniaturization. The existing feeder network is bulky, which is not conducive to the integration of the satellite antenna RF front end. And most of them work at a single frequency, which is not conducive to working under multi-frequency or broadband conditions.
技术问题  technical problem
[0003] 本发明的主要目的提供一种双频宽带馈电网络， 旨在解决现有的馈电网络体积 庞大， 不利于卫星天线射频前端的集成， 而且大多工作在单一频点， 不利于在 多频或宽带条件下工作的技术问题。  [0003] The main object of the present invention is to provide a dual-band broadband feed network, which aims to solve the problem that the existing feed network is bulky, which is not conducive to the integration of the satellite antenna RF front end, and most of them work at a single frequency point, which is disadvantageous in Technical problems in working under multi-frequency or broadband conditions.
问题的解决方案  Problem solution
技术解决方案  Technical solution
[0004] 为实现上述目的， 本发明提供了一种双频宽带馈电网络， 包括同轴连接器、 第 一端口、 第二端口、 第三端口、 第四端口、 第一双频耦合器和第二双频耦合器 ， 其中：  To achieve the above object, the present invention provides a dual-band broadband feed network including a coaxial connector, a first port, a second port, a third port, a fourth port, a first dual frequency coupler, and a second dual frequency coupler, wherein:
[0005] 同轴连接器的信号线连接至第一双频耦合器的输入端， 同轴连接器的地线连接 至第二双频耦合器的输入端；  [0005] a signal line of the coaxial connector is connected to an input end of the first dual frequency coupler, and a ground line of the coaxial connector is connected to an input end of the second dual frequency coupler;
[0006] 第一双频耦合器的直通端连接至第一端口的输入端， 第一双频耦合器的耦合端 连接至第二端口的输入端， 第一双频耦合器的隔离端连接至第一电阻； [0007] 第二双频耦合器的直通端连接至第四端口的输入端， 第二双频耦合器的耦合端 连接至第三端口的输入端， 第二双频耦合器的隔离端连接至第二电阻； [0006] The through end of the first dual frequency coupler is connected to the input end of the first port, the coupling end of the first dual frequency coupler is connected to the input end of the second port, and the isolated end of the first dual frequency coupler is connected to First resistance [0007] The through end of the second dual frequency coupler is connected to the input end of the fourth port, the coupling end of the second dual frequency coupler is connected to the input end of the third port, and the isolated end of the second dual frequency coupler is connected to Second resistance
[0008] 所述第一双频耦合器和第二双频耦合器均由十二节传输线组成， 每一节传输线 的电长度均为四分之一波长。  [0008] The first dual frequency coupler and the second dual frequency coupler are each composed of twelve transmission lines, and each of the transmission lines has an electrical length of one quarter wavelength.
[0009] 优选的， 所述同轴连接器、 第一端口、 第二端口、 第三端口和第四端口的阻抗 均为 50Ω。  [0009] Preferably, the impedances of the coaxial connector, the first port, the second port, the third port, and the fourth port are both 50 Ω.
[0010] 优选的， 所述第一电阻和第二电阻的电阻值均为 50Ω。  [0010] Preferably, the resistance values of the first resistor and the second resistor are both 50 Ω.
[0011] 优选的， 所述第一双频耦合器和第二双频耦合器均包括四个双枝节阻抗匹配器 和一个分支线耦合器， 所述分支线耦合器的四个联接端对应连接至四个双枝节 阻抗匹配器上。  [0011] Preferably, the first dual frequency coupler and the second dual frequency coupler respectively comprise four double branch impedance matching devices and one branch line coupler, and the four connection ends of the branch line coupler are correspondingly connected Up to four double-branch impedance matchers.
[0012] 优选的， 所述双枝节阻抗匹配器包括传输线 Z1和传输线 Ζ2， 所述传输线 Z1与 传输线 Ζ2串接。  [0012] Preferably, the double-branch section impedance matching device includes a transmission line Z1 and a transmission line Ζ2, and the transmission line Z1 is connected in series with the transmission line Ζ2.
[0013] 优选的， 所述传输线 Z1的阻抗为 85Ω， 所述传输线 Ζ2的阻抗为 62Ω。  [0013] Preferably, the impedance of the transmission line Z1 is 85 Ω, and the impedance of the transmission line Ζ2 is 62 Ω.
[0014] 优选的， 所述分支线耦合器包括两节传输线 Ζ3和两节传输线 Ζ4， 所述传输线 Ζ [0014] Preferably, the branch line coupler includes two transmission lines Ζ3 and two transmission lines Ζ4, and the transmission line Ζ
3和传输线 Ζ4交替串接成环状结构。 3 and the transmission line Ζ4 are alternately connected in series to form a ring structure.
[0015] 优选的， 所述传输线 Ζ3的阻抗为 24Ω， 所述传输线 Ζ4的阻抗为 33Ω。 [0015] Preferably, the impedance of the transmission line Ζ3 is 24 Ω, and the impedance of the transmission line Ζ4 is 33 Ω.
发明的有益效果  Advantageous effects of the invention
有益效果  Beneficial effect
[0016] 相较于现有技术， 本发明所述双频宽带馈电网络采用上述技术方案， 达到了如 下技术效果： 利用同轴连接器的信号线与地线对两个双频耦合器进行馈电， 在 四个输出端口的相邻端口间实现 90°的移相。 通过对耦合器的合理布设， 实现馈 电网络的小型化。 此外， 可以调节双频耦合器的阻抗匹配实现双频特性， 如果 两个频点挨得比较近， 可以实现宽带特性。  Compared with the prior art, the dual-band broadband feed network of the present invention adopts the above technical solution, and achieves the following technical effects: using two coaxial couplers of signal lines and ground lines of a coaxial connector Feed, achieve 90° phase shift between adjacent ports of the four output ports. The miniaturization of the feed network is achieved by rationally arranging the couplers. In addition, the impedance matching of the dual-frequency coupler can be adjusted to achieve dual-frequency characteristics. If the two frequencies are close together, broadband characteristics can be achieved.
对附图的简要说明  Brief description of the drawing
附图说明  DRAWINGS
[0017] 图 1是本发明双频宽带馈电网络优选实施例的电路结构示意图；  1 is a schematic diagram showing the circuit structure of a preferred embodiment of a dual-band broadband feed network according to the present invention;
[0018] 图 2是本发明双频宽带馈电网络的 S参数仿真结果示意图； 2 is a schematic diagram of S-parameter simulation results of the dual-band broadband feed network of the present invention;
[0019] 图 3是本发明双频宽带馈电网络的相位差仿真结果示意图。 [0020] 本发明目的实现、 功能特点及优点将结合实施例， 将在具体实施方式部分一并 参照附图做进一步说明。 3 is a schematic diagram showing phase difference simulation results of the dual-band broadband feed network of the present invention. [0020] The objects, features, and advantages of the present invention will be described in conjunction with the embodiments of the invention.
实施该发明的最佳实施例  BEST MODE FOR CARRYING OUT THE INVENTION
本发明的最佳实施方式  BEST MODE FOR CARRYING OUT THE INVENTION
[0021] 为更进一步阐述本发明为达成上述目的所采取的技术手段及功效， 以下结合附 图及较佳实施例， 对本发明的具体实施方式、 结构、 特征及其功效进行详细说 明。 应当理解， 此处所描述的具体实施例仅仅用以解释本发明， 并不用于限定 本发明。 The specific embodiments, structures, features and utilities of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0022] 参照图 1所示， 图 1是本发明双频宽带馈电网络优选实施例的电路结构示意图。  [0022] Referring to FIG. 1, FIG. 1 is a schematic diagram showing the circuit structure of a preferred embodiment of a dual-band broadband feed network according to the present invention.
在本实施例中， 所述的双频宽带馈电网络集成于 PCB板上， 包括同轴连接器 P0、 第一端口 Pl、 第二端口 P2、 第三端口 P3、 第四端口 P4、 第一双频耦合器 1和第二 双频耦合器 2。 所述同轴连接器 P0为一个阻抗值为 50Ω (欧姆） 的同轴连接器， 作为圆极化天线或阵列天线的同轴馈电部。 同轴连接器 P0的信号线连接至第一 双频耦合器 1的输入端， 同轴连接器 P0的地线连接至第二双频耦合器 2的输入端 。 其中： 第一双频耦合器 1的直通端连接至第一端口 Pl、 第一双频耦合器 1的耦 合端连接至第二端口 P2、 第一双频耦合器 1的隔离端连接至第一电阻 Rl。 第二双 频耦合器 2的直通端连接至第四端口 P4、 第二双频耦合器 2的耦合端连接至第三 端口 P3、 第二双频耦合器 2的隔离端连接至第二电阻 R2。 所述第一电阻 R1和第二 电阻 R2的电阻值均优选为 50Ω， 所述同轴连接器 Ρ0、 同轴连接器 Ρ0、 第一端口 Ρ 1、 第二端口 Ρ2、 第三端口 Ρ3和第四端口 Ρ4的阻抗均优选为 50Ω。  In this embodiment, the dual-band broadband feed network is integrated on the PCB, and includes a coaxial connector P0, a first port P1, a second port P2, a third port P3, a fourth port P4, and a first Dual frequency coupler 1 and second dual frequency coupler 2. The coaxial connector P0 is a coaxial connector having an impedance value of 50 Ω (ohms) as a coaxial feeding portion of a circularly polarized antenna or an array antenna. The signal line of the coaxial connector P0 is connected to the input terminal of the first dual frequency coupler 1, and the ground of the coaxial connector P0 is connected to the input terminal of the second dual frequency coupler 2. Wherein: the through end of the first dual frequency coupler 1 is connected to the first port P1, the coupling end of the first dual frequency coupler 1 is connected to the second port P2, and the isolated end of the first dual frequency coupler 1 is connected to the first Resistance Rl. The through end of the second dual frequency coupler 2 is connected to the fourth port P4, the coupling end of the second dual frequency coupler 2 is connected to the third port P3, and the isolated end of the second dual frequency coupler 2 is connected to the second resistor R2. . The resistance values of the first resistor R1 and the second resistor R2 are each preferably 50 Ω, the coaxial connector Ρ0, the coaxial connector Ρ0, the first port Ρ 1, the second port Ρ2, the third port Ρ3, and the The impedance of the four port Ρ 4 is preferably 50 Ω.
[0023] 所述第一双频耦合器 1和第二双频耦合器 2均包括四个双枝节阻抗匹配器 11和一 个分支线耦合器 12， 所述分支线耦合器 12的四个联接端对应连接至四个双枝节 阻抗匹配器 11上， 即分支线耦合器 12的一个联接端连接一个双枝节阻抗匹配器 1 1。 每一个双枝节阻抗匹配器 11包括一节传输线 Z1和一节传输线 Ζ2， 其中传输线 Z1与传输线 Ζ2串接。 所述分支线耦合器 12包括两节传输线 Ζ3和两节传输线 Ζ4， 所述两节传输线 Ζ3和两节传输线 Ζ4交替串接成环状结构。 在本实施例中， 所述 传输线 Z1的阻抗优选为 85Ω， 传输线 Ζ2的阻抗优选为 62Ω， 传输线 Ζ3的阻抗优选 为 24Ω， 以及传输线 Ζ4的阻抗优选为 33Ω。 所述传输线 Zl、 传输线 Ζ2、 传输线 Ζ3 和传输线 Z4的阻抗也可采用其它适合阻抗值。 [0023] The first dual frequency coupler 1 and the second dual frequency coupler 2 each include four double branch impedance matching devices 11 and one branch line coupler 12, and four connection ends of the branch line coupler 12 Correspondingly connected to the four double-branch section impedance matching unit 11, that is, one coupling end of the branch line coupler 12 is connected to a double-branch section impedance matching unit 11. Each of the double-branch impedance matching devices 11 includes a transmission line Z1 and a transmission line Ζ2, wherein the transmission line Z1 is connected in series with the transmission line Ζ2. The branch line coupler 12 includes two transmission lines Ζ3 and two transmission lines Ζ4, and the two transmission lines Ζ3 and the two transmission lines Ζ4 are alternately connected in series to form a ring structure. In the present embodiment, the impedance of the transmission line Z1 is preferably 85 Ω, the impedance of the transmission line Ζ2 is preferably 62 Ω, the impedance of the transmission line Ζ3 is preferably 24 Ω, and the impedance of the transmission line Ζ4 is preferably 33 Ω. The transmission line Z1, the transmission line Ζ2, and the transmission line Ζ3 Other suitable impedance values can also be used for the impedance of the transmission line Z4.
[0024] 在本实施例中， 所述第一双频耦合器 1和第二双频耦合器 2均由十二节传输线组 成， 每一节传输线的电长度均为 1/4波长， 即传输线 Zl、 传输线 Z2、 传输线 Z3和 传输线 Z4的电长度都为 1/4波长。 所述分支线耦合器 12的四个联接端都连接至四 个双枝节阻抗匹配器 11， 可以在两个频率上实现阻抗变换。 如果这两个频率间 隔很远 （例如等于或大于 1GHz) ， 此吋第一双频耦合器 1和第二双频耦合器 2实 现双频特性， 如果这两个频率间隔很近 （例如小于 200MHz) ， 此吋第一双频耦 合器 1和第二双频耦合器 2实现宽带特性。  [0024] In this embodiment, the first dual frequency coupler 1 and the second dual frequency coupler 2 are each composed of twelve transmission lines, and each of the transmission lines has an electrical length of 1/4 wavelength, that is, a transmission line. The electrical lengths of Z1, transmission line Z2, transmission line Z3, and transmission line Z4 are both 1/4 wavelength. The four coupling ends of the branch line coupler 12 are connected to four double-branch section impedance matchers 11, and impedance transformation can be achieved at two frequencies. If the two frequencies are far apart (eg, equal to or greater than 1 GHz), the first dual frequency coupler 1 and the second dual frequency coupler 2 achieve dual frequency characteristics if the two frequencies are closely spaced (eg, less than 200 MHz) ), the first dual frequency coupler 1 and the second dual frequency coupler 2 achieve wideband characteristics.
[0025] 结合图 1所示， 同轴连接器 P0的同轴馈电信号线 （假设为 0°的信号移相） 连接 至第一双频耦合器 1上， 可以实现信号 90°的移相， 即同轴连接器 P0输出 0°的信号 移相， 第二端口 P2输出 -90°的信号移相， 同轴连接器 P0的同轴馈电的地线， 此吋 等效为 -180°的信号移相。 同轴连接器 P0通过同轴馈电的地线连接到第二双频耦 合器 2后， 也可以实现 90°的信号移相， 即第三端口 P3输出 -180°的信号移相， 端 口 P5输出 -270°的信号移相。 因此， 双频宽带馈电网络可以依次输出 0°、 -90°、 -1 80°和 -270°的等幅信号。  [0025] As shown in FIG. 1, the coaxial feed signal line of the coaxial connector P0 (assuming a phase shift of 0° signal) is connected to the first dual-frequency coupler 1, and the phase shift of the signal of 90° can be realized. That is, the coaxial connector P0 outputs 0° signal phase shift, the second port P2 outputs -90° signal phase shift, and the coaxial connector P0 coaxially feeds the ground line, which is equivalent to -180° Signal phase shifting. After the coaxial connector P0 is connected to the second dual-frequency coupler 2 through the ground line of the coaxial feed, the signal phase shift of 90° can also be realized, that is, the signal phase shift of the third port P3 output -180°, port P5 Output -270° signal phase shift. Therefore, the dual-band wideband feed network can sequentially output equal-amplitude signals of 0°, -90°, -1 80°, and -270°.
[0026] 参考图 2所示， 图 2是本发明双频宽带馈电网络的 S参数仿真结果示意图。 从图 2 可以看出， 在 1.75GHz到 2.35GHz内， 同轴连接器 P0的反射系数 IS00I在 -10dB以下 ， 说明双频宽带馈电网络的相对带宽可以达到 39%， 实现了双频宽带馈电网络的 宽带特性。 当相对于同轴连接器 P0的四个输出端口得到的信号能量 （如图 2中的 I S10l、 IS20I、 IS30I、 IS40I) 在 -6dB附近， 说明信号能量可以从同轴连接器 P0被近 似于四等分的分配到四个输出端上， 即信号能量可以从同轴连接器 P0均等地分 配到第一端口 Pl、 第二端口 P2、 第三端口 P3和第四端口 P4。  Referring to FIG. 2, FIG. 2 is a schematic diagram of S-parameter simulation results of the dual-band broadband feed network of the present invention. It can be seen from Figure 2 that the reflection coefficient IS00I of the coaxial connector P0 is below -10dB in the range of 1.75GHz to 2.35GHz, indicating that the relative bandwidth of the dual-band broadband feed network can reach 39%, realizing the dual-band broadband feed. Broadband characteristics of electrical networks. When the signal energy obtained with respect to the four output ports of the coaxial connector P0 (such as I S10l, IS20I, IS30I, IS40I in FIG. 2) is around -6 dB, the signal energy can be approximated from the coaxial connector P0. The quarters are equally distributed to the four outputs, i.e., signal energy can be equally distributed from the coaxial connector P0 to the first port P1, the second port P2, the third port P3, and the fourth port P4.
[0027] 参考图 3所示， 图 3是本发明双频宽带馈电网络的相位差仿真结果示意图。 从图 3中可以看出， 双频宽带馈电网络相邻端口间的相位差基本稳定在 90°移相附近， 这说明双频宽带馈电网络的四个输出端之间有优良的移相效果。 结合图 2所示， 由于四个端口 （第一端口 Pl、 第二端口 P2、 第三端口 P3和第四端口 P4) 之间的 信号能量是等幅， 相位依次相差 90°移相， 因此该双频宽带馈电网络可以被广泛 应用在圆极化天线的馈电上， 比如圆极化天线阵列或四臂螺旋天线， 还可以应 用在射频领域中需要一分四功分效果的射频器件上。 Referring to FIG. 3, FIG. 3 is a schematic diagram showing phase difference simulation results of the dual-band broadband feed network of the present invention. It can be seen from Figure 3 that the phase difference between adjacent ports of the dual-band broadband feed network is basically stable near the phase shift of 90°, which indicates that there is excellent phase shift between the four outputs of the dual-band wideband feed network. effect. As shown in FIG. 2, since the signal energy between the four ports (the first port P1, the second port P2, the third port P3, and the fourth port P4) is equal amplitude, the phases are phase-shifted by 90°, so the Dual-band broadband feed networks can be widely used in the feeding of circularly polarized antennas, such as circularly polarized antenna arrays or four-armed helical antennas. Used in RF devices that require a four-point effect in the RF field.
[0028] 本发明提出的双频宽带馈电网络利用同轴连接器 P0的信号线与地线对两个双频 耦合器进行馈电， 在四个输出端口 （端口 Pl、 P2、 P3和 P4) 的相邻端口间实现 9 0°的移相。 通过对双频耦合器的合理布设， 实现馈电网络的小型化。 本发明所述 双频宽带馈电网络的另外一个优点是， 通过双频耦合器的阻抗匹配实现双频特 性， 如果两个频点挨得比较近， 可以实现宽带特性。  [0028] The dual-band broadband feed network proposed by the present invention feeds two dual-frequency couplers by using a signal line and a ground line of a coaxial connector P0, at four output ports (ports P1, P2, P3, and P4). A phase shift of 90° is achieved between adjacent ports. The miniaturization of the feed network is realized by rationally arranging the dual-frequency coupler. Another advantage of the dual-band wideband feed network of the present invention is that dual-frequency characteristics are achieved by impedance matching of the dual-frequency coupler. If the two frequencies are relatively close, broadband characteristics can be achieved.
[0029] 以上仅为本发明的优选实施例， 并非因此限制本发明的专利范围， 凡是利用本 发明说明书及附图内容所作的等效结构或等效功能变换， 或直接或间接运用在 其他相关的技术领域， 均同理包括在本发明的专利保护范围内。  The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent function transformations made by the description of the invention and the drawings are directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.
工业实用性  Industrial applicability
[0030] 相较于现有技术， 本发明所述双频宽带馈电网络采用上述技术方案， 达到了如 下技术效果： 利用同轴连接器的信号线与地线对两个双频耦合器进行馈电， 在 四个输出端口的相邻端口间实现 90°的移相。 通过对耦合器的合理布设， 实现馈 电网络的小型化。 此外， 可以调节双频耦合器的阻抗匹配实现双频特性， 如果 两个频点挨得比较近， 可以实现宽带特性。  Compared with the prior art, the dual-band broadband feed network of the present invention adopts the above technical solution, and achieves the following technical effects: using two coaxial couplers of signal lines and ground lines of a coaxial connector Feed, achieve 90° phase shift between adjacent ports of the four output ports. The miniaturization of the feed network is achieved by rationally arranging the couplers. In addition, the impedance matching of the dual-frequency coupler can be adjusted to achieve dual-frequency characteristics. If the two frequencies are close together, broadband characteristics can be achieved.

Claims

权利要求书 Claim
一种双频宽带馈电网络， 其特征在于， 所述的双频宽带馈电网络包括 同轴连接器、 第一端口、 第二端口、 第三端口、 第四端口、 第一双频 耦合器和第二双频耦合器， 其中： 同轴连接器的信号线连接至第一双 频耦合器的输入端， 同轴连接器的地线连接至第二双频耦合器的输入 端； 第一双频耦合器的直通端连接至第一端口的输入端， 第一双频耦 合器的耦合端连接至第二端口的输入端， 第一双频耦合器的隔离端连 接至第一电阻； 第二双频耦合器的直通端连接至第四端口的输入端， 第二双频耦合器的耦合端连接至第三端口的输入端， 第二双频耦合器 的隔离端连接至第二电阻； 第一双频耦合器和第二双频耦合器均由十 二节传输线组成， 每一节传输线的电长度均为四分之一波长。  A dual-band broadband feed network, characterized in that: the dual-band broadband feed network comprises a coaxial connector, a first port, a second port, a third port, a fourth port, and a first dual-frequency coupler And a second dual frequency coupler, wherein: the signal line of the coaxial connector is connected to the input end of the first dual frequency coupler, and the ground line of the coaxial connector is connected to the input end of the second dual frequency coupler; The through end of the dual frequency coupler is connected to the input end of the first port, the coupling end of the first dual frequency coupler is connected to the input end of the second port, and the isolated end of the first dual frequency coupler is connected to the first resistor; The through end of the two dual frequency coupler is connected to the input end of the fourth port, the coupling end of the second dual frequency coupler is connected to the input end of the third port, and the isolated end of the second dual frequency coupler is connected to the second resistor; The first dual frequency coupler and the second dual frequency coupler are each composed of twelve transmission lines, each of which has an electrical length of one quarter wavelength.
如权利要求 1所述的双频宽带馈电网络， 其特征在于， 所述同轴连接 器、 第一端口、 第二端口、 第三端口和第四端口的阻抗均为 50Ω。 如权利要求 1所述的双频宽带馈电网络， 其特征在于， 所述第一电阻 和第二电阻的电阻值均为 50Ω。  The dual-band wideband feed network of claim 1, wherein the coaxial connector, the first port, the second port, the third port, and the fourth port each have an impedance of 50 Ω. The dual-frequency broadband feed network according to claim 1, wherein the resistance values of the first resistor and the second resistor are both 50 Ω.
如权利要求 1所述的双频宽带馈电网络， 其特征在于， 所述第一双频 耦合器和第二双频耦合器均包括四个双枝节阻抗匹配器和一个分支线 耦合器， 所述分支线耦合器的四个联接端对应连接至四个双枝节阻抗 匹配器上。  The dual-band broadband feed network according to claim 1, wherein the first dual-frequency coupler and the second dual-frequency coupler each comprise four double-branch impedance matchers and a branch line coupler. The four coupling ends of the branch line coupler are correspondingly connected to four double-branch section impedance matchers.
如权利要求 4所述的双频宽带馈电网络， 其特征在于， 所述双枝节阻 抗匹配器包括传输线 Z1和传输线 Ζ2， 所述传输线 Z1与传输线 Ζ2串接  The dual-band broadband feed network according to claim 4, wherein the double-branch impedance matching device comprises a transmission line Z1 and a transmission line Ζ2, and the transmission line Z1 is connected in series with the transmission line Ζ2.
[权利要求 6] 如权利要求 5所述的双频宽带馈电网络， 其特征在于， 所述传输线 Z1 的阻抗为 85Ω， 所述传输线 Ζ2的阻抗为 62Ω。 [Claim 6] The dual-frequency broadband feed network according to claim 5, wherein the impedance of the transmission line Z1 is 85 Ω, and the impedance of the transmission line Ζ2 is 62 Ω.
[权利要求 7] 如权利要求 4所述的双频宽带馈电网络， 其特征在于， 所述分支线耦 合器包括两节传输线 Ζ3和两节传输线 Ζ4， 所述传输线 Ζ3和传输线 Ζ4 交替串接成环状结构。 [Claim 7] The dual-band broadband feed network according to claim 4, wherein the branch line coupler comprises two transmission lines Ζ3 and two transmission lines ,4, and the transmission line Ζ3 and the transmission line Ζ4 are alternately connected in series Form a ring structure.
[权利要求 8] 如权利要求 7所述的双频宽带馈电网络， 其特征在于， 所述传输线 Ζ3 的阻抗为 24Ω， 所述传输线 Ζ4的阻抗为 33Ω。 [Claim 8] The dual-band broadband feed network according to claim 7, wherein the transmission line Ζ3 The impedance of the transmission line 244 is 33 Ω.
PCT/CN2017/084462 2016-12-29 2017-05-16 Dual-frequency broadband feed network WO2018120592A1 (en)

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