阅读说明：本技术 一种宽带可重构天线馈电网络 (Broadband reconfigurable antenna feed network ) 是由 袁文韬 张德平 许庆华 黄昭宇 江云 熊哲 赵方伟 钱雯涛 罗桃红 李濛 于 2021-08-30 设计创作，主要内容包括：本发明提供一种宽带可重构天线馈电系统,包括：功分器,用于将输入信号分成两路子信号；定向耦合器组件,包括第一定向耦合器和第二定向耦合器,第一定向耦合器与第二定向耦合器均与功分器的两个信号输出端相连,以用于接收对应的子信号,第一定向耦合器与第二定向耦合器同时与信号输出端口相连,用于输出信号；分支线式加载型移相器,用于产生宽带微带线45°相位差,与定向耦合器组合使用；二极管组件,多个二极管至少与第一定向耦合器和第二定向耦合器相连；以及控制器,其至少与多个二极管相连,以通过控制多个二极管的导通或断开调整第一定向耦合器和第二定向耦合器的端口反射系数,使第一定向耦合器和第二定向耦合器分别形成目标移相器。(The invention provides a broadband reconfigurable antenna feed system, comprising: the power divider is used for dividing an input signal into two paths of sub-signals; the directional coupler assembly comprises a first directional coupler and a second directional coupler, the first directional coupler and the second directional coupler are connected with two signal output ends of the power divider respectively and used for receiving corresponding sub signals, and the first directional coupler and the second directional coupler are simultaneously connected with the signal output port and used for outputting signals; the branch line type loading phase shifter is used for generating a 45-degree phase difference of the broadband microstrip line and is combined with the directional coupler for use; a diode assembly, a plurality of diodes connected to at least the first directional coupler and the second directional coupler; and the controller is at least connected with the plurality of diodes so as to adjust the port reflection coefficients of the first directional coupler and the second directional coupler by controlling the connection or disconnection of the plurality of diodes, so that the first directional coupler and the second directional coupler respectively form a target phase shifter.)

1. A broadband reconfigurable antenna feed system, comprising:

the power divider is used for dividing an input signal into two paths of sub-signals;

the directional coupler assembly comprises a first directional coupler and a second directional coupler, the first directional coupler and the second directional coupler are respectively connected with two signal output ends of the power divider so as to be used for receiving the corresponding sub-signals, and the first directional coupler and the second directional coupler are simultaneously connected with a signal output port so as to be used for outputting signals;

the branch line type loading phase shifter is used for generating a 45-degree phase difference of the broadband microstrip line and is combined with the directional coupler for use;

a diode assembly comprising a plurality of diodes coupled to at least the first directional coupler and the second directional coupler; and

and the controller is connected with at least the plurality of diodes so as to adjust at least port reflection coefficients of the first directional coupler and the second directional coupler by controlling the connection or disconnection of the plurality of diodes, so that the first directional coupler and the second directional coupler respectively form a target phase shifter.

2. The wideband reconfigurable antenna feed system of claim 1, wherein the first and second directional couplers each have a rectangular defected ground structure for increased bandwidth.

3. The feeding system of claim 1, wherein the first directional coupler comprises a first port, a second port, a third port and a fourth port, the first port and the second port are located on a first side of the first directional coupler, the first port is connected to one of the signal output ends of the power divider, the second port is connected to a network signal output port, the third port and the fourth port are located on a second side of the first directional coupler, and are respectively connected to the plurality of diodes and the branch line loading type phase shifters so as to have the same reflection coefficient, and the reflected power of the first directional coupler cancels out at the first port and is output in a superimposed manner at the second port;

the second directional coupler and the first directional coupler are arranged in the same structure and connection relationship, and the second directional coupler and the first directional coupler are arranged in mirror symmetry.

4. The broadband reconfigurable antenna feeding system according to claim 3, wherein a first diode component is connected to each of the outgoing lines of the third ports of the first directional coupler and the second directional coupler, and includes a first diode, a second diode and a third diode that are connected in sequence, a second diode component is connected to each of the outgoing lines of the fourth ports, and includes a fourth diode, a fifth diode and a sixth diode that are connected in sequence, and the second ports of the first directional coupler and the second coupler are respectively led out through a lead to form the signal output port.

5. The broadband reconfigurable antenna feeding system according to claim 3, wherein when the controller controls all of the plurality of diode assemblies to be in the off state, reflection coefficients of third and fourth ports of the first and second directional couplers are all 1, and phase differences are all 0 °; when the controller controls the first diode to be in a conducting state and the other diodes to be in a disconnecting state, the reflection coefficients of the third port and the fourth port are-1, the phase difference is 180 degrees, and the first directional coupler and the second directional coupler respectively form a 0-degree/180-degree phase shifter under the control of the controller.

6. The feeding system of claim 5, wherein a branch line loading type phase shifter is connected between the second diode and the third diode, and between the fifth diode and the sixth diode, and a phase difference between the third port and the fourth port of the first directional coupler and the second directional coupler connected to the branch line phase shifter is 45 °; the controller controls the first diode and the third diode to be in an off state and the second diode to be in an on state, so that the reflection coefficient of two ports of the branch line phase shifter is 1, the phase difference is 90 degrees, and controls the first diode to be in the off state and the second diode and the third diode to be in the on state, so that the reflection coefficient of two ports of the branch line phase shifter is-1, the phase difference is-90 degrees, and the branch line phase shifter is formed into a +/-90-degree phase shifter.

7. The broadband reconfigurable antenna feeding system according to claim 5, wherein when the controller controls all the diodes to be in an off state, the second ports of the first directional coupler and the second directional coupler are respectively connected to one of the signal output ports, and the signal output ports form horizontally polarized ports;

the controller controls the second diode, the third diode, the fifth diode and the sixth diode to be in an off state, and controls the signal output port to form a vertical polarization port when the first diode and the fourth diode are in an on state.

8. The feeding system of claim 5, wherein the controller controls each of the first diode, the third diode, the fourth diode and the sixth diode to be in an off state, and controls each of the second diode and the fifth diode to be in an on state, and the signal output port forms a left-handed circularly polarized port;

the controller controls each first diode and each fourth diode to be in an off state, and controls each second diode, each third diode, each fifth diode and each sixth diode to be in an on state, and the signal output port forms a right-hand circularly polarized port.

9. A broadband reconfigurable antenna feed system according to claim 1, wherein the signal output port is connected to a dual polarized antenna.

10. An electronic device, characterized in that it comprises a broadband reconfigurable antenna feed system according to any of claims 1-9.

Technical Field

The embodiment of the invention relates to the field of antennas, in particular to a broadband reconfigurable antenna feed network.

Background

In the field of modern microwave communication, in order to meet the requirements of information systems for multifunctional, ultra-wideband and large-capacity transmission, the number of information transmission subsystems is gradually increased, and the number of antennas serving as important components for signal transmission and reception of the whole system is correspondingly increased.

Against this background, d.h. schaubert et al, in 1983, proposed the concept of "reconfigurable antenna" that can achieve multiple functions of the antenna by changing one or more parameters of the frequency, polarization and pattern of the antenna, thereby enabling the operating state of the antenna to be adjusted at any time. Therefore, the number of antennas on the radar system can be reduced, the weight of the radar system, particularly a missile-borne system, is reduced, the electromagnetic compatibility among system antenna arrays is improved, and the restriction of the number of antennas on the development of a microwave communication system is effectively relieved.

The polarization reconfigurable antenna is one of key research objects in reconfigurable antenna research, and can improve the spatial degree of freedom and obtain larger gain in a limited system volume, thereby greatly improving the transmission rate and the system capacity of a wireless communication system; in a modern wireless communication system, in order to improve the anti-interference capability of the system, the transmission mode of a wireless channel is changed at any time, and the polarization of an antenna is timely adjusted according to different channel transmission characteristics, so that the system is always in the best state for receiving signals. In addition, through polarization diversity, the polarization reconfigurable antenna can also be used for realizing frequency reuse, thereby improving the system capacity. The polarization reconfigurable antenna capable of realizing more than two polarization forms simultaneously has incomparable superiority of the traditional antenna in the aspects of frequency multiplexing and improvement of the performance of a polarization control system. In satellite communications and radar detection systems, polarization reconfiguration may be used to reduce polarization losses. The traditional antenna adopts polarization modes such as vertical polarization, horizontal polarization, + 45-degree oblique polarization, -45-degree oblique polarization, left-hand circular polarization, right-hand circular polarization and the like, wherein the first four polarizations belong to linear polarization, and the second two polarizations belong to circular polarization. Typical methods for implementing a polarization reconfigurable antenna are: a PIN diode is used between the radiator and the feed network, and the electric field radiation direction of the antenna is changed by controlling the on-off of the diode, so that the reconfigurable functions of various polarization modes such as vertical/horizontal dual polarization, left/right hand circular polarization and the like are realized.

However, the existing polarization reconfigurable antenna is limited by the structure and has the defects of difficult realization of multi-polarization, wide frequency band, complex circuit and the like.

Disclosure of Invention

The embodiment of the invention provides a broadband reconfigurable antenna feed system, which comprises:

the power divider is used for dividing an input signal into two paths of sub-signals;

the directional coupler assembly comprises a first directional coupler and a second directional coupler, the first directional coupler and the second directional coupler are respectively connected with two signal output ends of the power divider so as to be used for receiving the corresponding sub-signals, and the first directional coupler and the second directional coupler are simultaneously connected with a signal output port so as to be used for outputting signals;

the branch line type loading phase shifter is used for generating a 45-degree phase difference of the broadband microstrip line and is combined with the directional coupler for use;

a diode assembly comprising a plurality of diodes coupled to at least the first directional coupler and the second directional coupler; and

and the controller is at least connected with the plurality of diodes and is used for adjusting the port reflection coefficients of the first directional coupler and the second directional coupler by controlling the connection or disconnection of the plurality of diodes so as to enable the first directional coupler and the second directional coupler to form a target phase shifter respectively.

As an embodiment, the first and second directional couplers each have a rectangular defected ground structure for increased bandwidth.

As an embodiment, the first directional coupler includes a first port, a second port, a third port and a fourth port, where the first port and the second port are located on a first side of the first directional coupler, the first port is connected to one of the signal output ends of the power divider, the second port is connected to a network signal output port, the third port and the fourth port are located on a second side of the first directional coupler and are respectively connected to the plurality of diodes to have the same reflection coefficient, and reflected powers of the first directional coupler are cancelled at the first port and are output in a superimposed manner at the second port;

the second directional coupler and the first directional coupler are arranged in the same structure and connection relationship, and the second directional coupler and the first directional coupler are arranged in mirror symmetry.

As an embodiment, the first diode assemblies are connected to the lead-out lines of the third ports of the first directional coupler and the second directional coupler, and each of the first diode assemblies includes a first diode, a second diode and a third diode, which are connected in sequence, the second diode assemblies are connected to the lead-out lines of the fourth ports, each of the second diode assemblies includes a fourth diode, a fifth diode and a sixth diode, which are connected in sequence, and the second ports of the first directional coupler and the second coupler are respectively led out through a lead to form the signal output port.

As an embodiment, when the controller controls all the diode assemblies to be in the off state, the reflection coefficients of the third port and the fourth port of the first directional coupler and the second directional coupler are both 1, the phase difference is both 0 °, when the controller controls the first diode to be turned on and the other diodes are in the off state, the reflection coefficients of the third port and the fourth port are both-1, the phase difference is both 180 °, and the first directional coupler and the second directional coupler respectively form a 0 °/180 ° phase shifter under the control of the controller.

As an embodiment, a branch line phase shifter is connected between the second diode and the third diode, and the phase difference between the two branch line phase shifters is 45 °; the controller controls the first diode and the third diode to be in an off state and the second diode to be in an on state, so that the reflection coefficient of two ports of the branch line phase shifter is 1, the phase difference is 90 degrees, and controls the first diode to be in the off state and the second diode and the third diode to be in the on state, so that the reflection coefficient of two ports of the branch line phase shifter is-1, the phase difference is-90 degrees, and the branch line phase shifter is formed into a +/-90-degree phase shifter.

As an embodiment, when the controller controls all the diodes to be in the off state, the second ports of the first directional coupler and the second coupler are respectively connected to one signal output port, and the signal output port forms a horizontally polarized port;

the controller controls the second diode, the third diode, the fifth diode and the sixth diode to be in an off state, and controls the signal output port to form a vertical polarization port when the first diode and the fourth diode are in an on state.

As an embodiment, the controller controls the first diode, the third diode, the fourth diode and the sixth diode to be in an off state, and controls the second diode and the fifth diode to be in an on state, and the signal output port forms a left-handed circular polarization port;

the controller controls the first diode and the fourth diode to be in an off state, and controls the second diode, the third diode, the fifth diode and the sixth diode to be in an on state, and the signal output port forms a right-hand circularly polarized port.

As an embodiment, the signal output port is connected to a dual-polarized antenna.

Another embodiment of the present invention also provides an electronic device, including the broadband reconfigurable antenna feeding system as described above.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

Fig. 1 is a schematic circuit structure diagram of a broadband reconfigurable antenna feed network in an embodiment of the present invention.

Fig. 2 is a schematic diagram of a directional coupler used as a phase shifter in an embodiment of the present invention.

Fig. 3 is a diagram of S parameters of a horizontally polarized port in an embodiment of the invention.

Fig. 3A is a phase difference diagram of a horizontally polarized port in an embodiment of the invention.

Fig. 4 shows S-parameters of a vertically polarized port in an embodiment of the invention.

Fig. 4A is a phase difference diagram of a vertically polarized port in an embodiment of the invention.

Fig. 5 is an S parameter diagram of a left-hand circular polarization port in an embodiment of the invention.

Fig. 5A is a phase difference diagram of a left-hand circular polarized port according to an embodiment of the invention.

Fig. 6 is a parameter diagram of a right-hand circularly polarized port S according to an embodiment of the invention.

Fig. 6A is a phase difference diagram of a right-hand circularly polarized port according to an embodiment of the invention.

Reference numerals:

1-a power divider; 2-a first directional coupler; 3-a second directional coupler; 4-a first port; 5-a second port; 6-a third port; 7-a fourth port; 8-a signal input port; 9-signal output port 1; 10-signal output port 2; 11-a first diode; 12-a second diode; 13-a third diode; 14-a fourth diode; 15-a fifth diode; 16-a sixth diode; 17. 18-branch line phase shifter

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in connection with the accompanying drawings, which are not intended to limit the invention.

It will be understood that various modifications may be made to the embodiments disclosed herein. The following description is, therefore, not to be taken in a limiting sense, but is made merely as an exemplification of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.

It should also be understood that, although the invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of the invention, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.

The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a broadband reconfigurable antenna feed system in an embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides a broadband reconfigurable antenna feed system, including:

the power divider 1 is used for dividing an input signal into two paths of sub-signals;

the directional coupler assembly comprises a first directional coupler 2 and a second directional coupler 3, the first directional coupler 2 and the second directional coupler 3 are both connected with two signal output ends of the power divider 1 to receive corresponding sub signals, and the first directional coupler 2 and the second directional coupler 3 are simultaneously connected with a signal output port to output signals;

the branch line type loading phase shifter is used for generating a 45-degree phase difference of the broadband microstrip line and is combined with the directional coupler for use;

a diode assembly comprising a plurality of diodes connected to at least the first directional coupler 2 and the second directional coupler 3; and

and the controller is connected with at least the plurality of diodes so as to adjust the port reflection coefficients of at least the first directional coupler 2 and the second directional coupler 3 by controlling the on-off of the plurality of diodes, so that at least the first directional coupler 2 and the second directional coupler 3 respectively form a target phase shifter.

The broadband polarization reconfigurable antenna feed system can widen the network frequency band, has universality, can provide feed for any dual-polarization antenna, and has the excellent performances of small insertion loss, high polarization switching speed and small phase difference fluctuation in the X-band full-wave band. Moreover, the system in the embodiment can ensure that the network polarization switching speed is high, the integration level is high, and the engineering use requirements of the microwave communication system are met.

Specifically, the power divider 1 in this embodiment adopts a wideband Wilkinson power divider 1 in which multiple impedance converters are cascaded, and the power divider 1 still has a certain isolation degree under the condition of an ultra-wide band, and can divide a wideband signal, i.e., an input signal, into two paths of sub-signals with equal amplitude and in phase.

Further, in order to increase the bandwidth of the first directional coupler 2 and the second directional coupler 3, both the two directional couplers in this embodiment are three-branch line couplers with a rectangular defected ground structure, and the width of the transmission line can be effectively increased by using the high resistance of the defected ground structure, i.e. the bandwidth can be increased by at least 50%.

Further, with reference to fig. 1, the first directional coupler 2 in this embodiment includes a first port 4, a second port 5, a third port 6, and a fourth port 7, where the first port 4 and the second port 5 are located on a first side of the first directional coupler 2, the first port 4 is connected to a signal output end of the power divider 1, the second port 5 is connected to a network signal output port, the third port 6 and the fourth port 7 are located on a second side of the first directional coupler 2 and are respectively connected to a plurality of diodes to have the same reflection coefficient, and the reflection power of the first directional coupler 2 is cancelled at the first port 4 and is output in a superimposed manner at the second port 5; the arrangement structure and the connection relationship of the second directional coupler 3 and the first directional coupler 2 are the same, and the second directional coupler 3 and the first directional coupler 2 are arranged in mirror symmetry, which can be referred to as fig. 1 specifically.

Specifically, as shown in fig. 2, the first port 4 and the second port 5 of the first directional coupler 2 and the second directional coupler 3 are originally isolated arms, but when the third port 6 and the fourth port 7 are connected to diodes, the first port 4 and the second port 5 form the same reflection coefficient Γ, and at this time, the reflected power is cancelled at the first port 4 and is superposed and output at the second port 5. A directionally coupled phase shifter formed in this manner, also referred to as a reflection-type, hybrid phase shifter, can be implemented as a two-port network from a first port 4 to a second port 5, with a scattering matrix of [ S' ], having:

S′11＝0 (1-1)

S′21＝jΓ＝j|Γ|exp(jψ) (1-2)

when the antenna feed network is to form the microwave phase shifter, and the controller controls all the diode assemblies to be in the off state, the reflection coefficients of the third port 6 and the fourth port 7 of the first directional coupler 2 and the second directional coupler 3 are both 1, and the phase difference is both 0 degrees. When the controller controls the first diode and the fourth diode to be in a conducting state, the reflection coefficients of the third port 6 and the fourth port 7 are-1, the phase difference is 180 degrees, and the first directional coupler 2 and the second directional coupler 3 respectively form a 0-degree/180-degree phase shifter under the control of the controller.

Furthermore, the leading-out lines of the third ports 6 of the first directional coupler 2 and the second directional coupler 3 are connected with a first diode 11 assembly which comprises a first diode 11, a second diode 12 and a third diode 13 which are connected in sequence, the leading-out lines of the fourth ports 7 are connected with a second diode 12 assembly which comprises a fourth diode 14, a fifth diode 15 and a sixth diode 16 which are connected in sequence, and the second ports 5 of the first directional coupler 2 and the second coupler are respectively led out through a lead wire to form a signal output port.

The signal output port is connected with the dual-polarized antenna. In order to facilitate interconnection between the two antennas, in this embodiment, a common SMA joint is used for the signal output port, so that the signal output port can be interconnected with any dual-polarized antenna.

Further, in another embodiment, a branch line phase shifter 17 and a branch line phase shifter 18 are connected between the second diode 12 and the third diode 13, and a branch line phase shifter 17 and a branch line phase shifter 18 are connected between the fifth diode 15 and the sixth diode 16, that is, a branch line phase shifter 17 or a branch line phase shifter 18 is connected to each of two directional couplers. The phase difference between the first directional coupler 2 to which the branch line phase shifter 17 is connected and the second directional coupler 3 to which the branch line phase shifter 18 is connected is 45 °. The controller controls the first diode 11 and the third diode 13 to be in an off state and the second diode 12 to be in an on state, so that the reflection coefficients of the two ports of the branch line phase shifters 17 and 18 are 1, and the phase difference is 90 degrees, and controls the first diode 11 to be in the off state and the second diode 12 and the third diode 13 to be in an on state, so that the reflection coefficients of the two ports of the branch line phase shifters 17 and 18 are-1, and the phase difference is-90 degrees, so that the first directional coupler 2 and the second directional coupler 3 form a +/-90-degree phase shifter. Similarly, the controller may control the fifth diode and the second sixth diode to be turned off or turned on simultaneously according to the control method, where the fifth diode corresponds to the second diode and the sixth diode corresponds to the third diode, and the control method is the same as above, which is not described in detail. Each directional coupler is a symmetric network from top to bottom, and specifically, as shown in fig. 1, the network in fig. 1 is a symmetric network from top to bottom, and from left to right.

The directional coupler and the branch line phase shifter are combined through the two embodiments, and the antenna system forms a 0 degree/180 degree/90 degree phase shifting network through controlling the short/open circuit of the diode.

Further, the controller may form different types of ports at the signal output port of the antenna system by controlling the operating states of different diodes, so as to achieve the multi-polarization effect of the antenna system, which is specifically described in detail by the following different embodiments:

the first embodiment is as follows:

in the embodiment, the controller controls the diodes to be all reverse-biased so that all the diodes are in the off state, and the first and second directional couplers 3 respectively form directional coupler type phase shifters, and the phase difference of the signal output ports 19 and 2 respectively connected to the two directional coupler type phase shifters is in the range of-5 ° to-12 ° and in the horizontal polarization state, and the s-parameter and the phase difference thereof can be referred to fig. 3. In the whole frequency band, for example, in the frequency band of the X-band from 8GHz to 12GHz, the reflection coefficient S11 of the signal input port 8 is smaller than-12 dB, and the transmission coefficients S21 and S31 from the signal input port 8 to the two signal output ports (including the signal output port 19 and the signal output port 210) fluctuate around-5 dB, so that the design index is reached.

Example two:

in this embodiment, the controller controls each of the second diode 12, the third diode 13, the fifth diode 15, and the sixth diode 16 to be in an off state, such as reverse bias, and controls each of the first diode 11 and the fourth diode 14 to be in an on state, such as forward bias, at which time the first directional coupler and the second directional coupler respectively form a directional coupler type phase shifter, a phase difference between a signal output port 19 connected to the two directional coupler type phase shifters and the port 2 is within 174 ° to 190 °, the signal output port forms a vertically polarized port, that is, the port is in a vertically polarized state, and s parameters and the phase difference thereof can be referred to fig. 4. In the whole frequency band, for example, in the frequency band of the X-band from 8GHz to 12GHz, the reflection coefficient S11 of the signal input port 8 is less than-10 dB, and the transmission coefficients S21 and S31 from the signal input port 8 to the signal output port 19 and the signal output port 210 fluctuate around-5 dB, so that the design index is reached.

Example three:

in this embodiment, when the controller controls each of the first diode 11, the third diode 13, the fourth diode 14, and the sixth diode 16 to be in an off state and controls each of the second diode 12 and the fifth diode 15 to be in an on state, at this time, the phase difference between the signal output port 19 and the port 2 of the directional coupler type phase shifter (the same principle as in the first and second embodiments) is within 82 ° to 99 °, the signal output port forms a left-hand circular polarization port, that is, the port is in a left-hand circular polarization state, and the s parameter and the phase difference thereof can be referred to fig. 5. In the whole frequency band, such as the frequency band of the X wave band from 8GHz to 12GHz, the reflection coefficient S11 of the signal input port 8 is smaller than-10 dB, and the transmission coefficients S21 and S31 from the signal input port 8 to the signal output port 19 and the port 2 fluctuate around-6 dB, so that the design index is reached.

Example four:

in this embodiment, the controller controls the first diode 11 and the fourth diode 14 to be in the off state, and controls the second diode 12, the third diode 13, the fifth diode 15, and the sixth diode 16 to be in the on state. At this time, the phase difference between the signal output port 19 of the directional coupler type phase shifter and the port 2 is within-82 ° to-99 °, the signal output port forms a right-hand circularly polarized port, the port is in a right-hand circularly polarized state, and the s-parameter and the phase difference thereof can be referred to fig. 6. In the whole frequency band, such as the frequency band of the X wave band from 8GHz to 12GHz, the reflection coefficient S11 of the signal input port 8 is smaller than-10 dB, and the transmission coefficients S21 and S31 from the signal input port 8 to the signal output port 19 and the port 2 fluctuate around-6 dB, so that the design index is reached.

Through the embodiments, the broadband polarization reconfigurable antenna feed system in the embodiments of the present application can enable the antenna to rapidly switch the radiation signals of vertical polarization, horizontal polarization, left-hand circular polarization and right-hand circular polarization in the frequency band from 8GHz to 12GHz, for example, so as to realize frequency reuse and improve the capacity of the antenna system. Meanwhile, the network circuit has small loss and high port output consistency, and is beneficial to the design of miniaturization and integration of a microwave antenna system.

Further, another embodiment of the present invention also provides an electronic device including the broadband reconfigurable antenna feeding system as described above.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.