WO2021196136A1

WO2021196136A1 - Circularly polarized antenna device and mobile platform

Info

Publication number: WO2021196136A1
Application number: PCT/CN2020/083037
Authority: WO
Inventors: 李栋; 尹航; 马超
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-10-07
Also published as: CN112655113A

Abstract

A circularly polarized antenna device (10) and a mobile platform (100). The circularly polarized antenna device (10) comprises a support assembly (11) and a radiation assembly (12). The radiation assembly (12) comprises four radiation units (120) arranged around the center of the support assembly (11). The electrical length of each radiation unit (120) is a quarter of a wavelength corresponding to the center frequency of the radiation assembly (12). Two adjacent radiation units (120) are disposed orthogonal to each other and spaced apart from each other. Each of at least two of the four radiation units (120) is correspondingly provided with a feed point (131).

Description

Circular polarization antenna device and movable platform

Technical field

This application relates to the field of communication technology, and in particular to a circularly polarized antenna device and a movable platform.

Background technique

Circularly polarized antennas have good anti-interference characteristics, and require less installation attitude, which can better improve the polarization adaptation of the receiving and transmitting systems. They are often mounted on movable platforms such as drones to optimize the performance of the movable platforms. Communication ability. However, current circularly polarized antennas are usually patch antennas with a side length of 1/2 wavelength. Such circularly polarized antennas have a large size, and have poor pattern symmetry and poor radiation performance.

Summary of the invention

The embodiments of the present application provide a circularly polarized antenna device and a movable platform.

The circular polarization antenna device of the embodiment of the present application includes a supporting component and a radiating component. The radiation component is disposed on the support component, the radiation component includes four radiation units arranged around the center of the support component, and the electrical length of each radiation unit is a wavelength corresponding to the center frequency of the radiation component In one quarter of the radiating unit, two adjacent radiating units are placed orthogonally and spaced apart from each other, and at least two of the four radiating units are correspondingly provided with feeding points.

The movable platform of the embodiment of the present application includes a phase shifting unit and a circularly polarized antenna device. The phase shift unit includes a signal input terminal and a signal output terminal. The feeding point of the circularly polarized antenna device is correspondingly connected with the signal output terminal. The circular polarization antenna device includes a supporting component and a radiating component. The radiation component is disposed on the support component, the radiation component includes four radiation units arranged around the center of the support component, and the electrical length of each radiation unit is a wavelength corresponding to the center frequency of the radiation component In one quarter of the radiating unit, two adjacent radiating units are placed orthogonally and spaced apart from each other, and at least two of the four radiating units are correspondingly provided with feeding points.

The circularly polarized antenna device and the movable platform of the embodiment of the present application realize circularly polarized radiation by arranging four orthogonally placed radiation units. The four orthogonally placed radiation units can improve the symmetry of the radiation pattern of the circular polarization antenna device and improve the radiation performance of the circular polarization antenna device. In addition, the electrical lengths of the four radiating units are all a quarter of the wavelength corresponding to the center frequency of the radiating component, which can effectively reduce the size of the circularly polarized antenna device.

The additional aspects and advantages of the embodiments of the present application will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the embodiments of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a front view of a circularly polarized antenna device according to an embodiment of the present application;

FIG. 2 is a side view of the circular polarization antenna device shown in FIG. 1;

Fig. 3 is a return loss diagram of the circularly polarized antenna device shown in Fig. 1;

4 to 7 are radiation patterns of the circularly polarized antenna device shown in FIG. 1;

Fig. 8 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

Fig. 9 is a side view of the circularly polarized antenna device shown in Fig. 8;

Fig. 10 is a return loss diagram of the circularly polarized antenna device shown in Fig. 8;

11 to 14 are radiation patterns of the circularly polarized antenna device shown in FIG. 8;

15 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

Fig. 16 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 17 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 18 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

Fig. 19 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

20 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 21 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

Fig. 22 is a side view of the circular polarization antenna device shown in Fig. 21;

FIG. 23 is a return loss diagram of the circularly polarized antenna device shown in FIG. 21;

24 to 27 are radiation patterns of the circular polarization antenna device shown in FIG. 21;

Fig. 28 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 29 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 30 is a front view of a circularly polarized antenna device according to another embodiment of the present application;

FIG. 31 is a schematic diagram of a movable platform according to an embodiment of the present application;

FIG. 32 is a schematic diagram of a phase shifting unit according to an embodiment of the present application;

FIG. 33 is a schematic diagram of a phase shifting unit according to another embodiment of the present application.

Detailed ways

The implementation of the present application will be further described below in conjunction with the accompanying drawings. The same or similar reference numerals in the drawings indicate the same or similar elements or elements with the same or similar functions throughout.

In addition, the implementation manners of the present application described below in conjunction with the drawings are exemplary, and are only used to explain the implementation manners of the present application, and should not be construed as limiting the application.

In this application, unless expressly stipulated and defined otherwise, the first feature “on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. touch. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than that of the second feature. The “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

Please refer to FIG. 1, an embodiment of the present application provides a circularly polarized antenna device 10. The circular polarization antenna device 10 includes a supporting component 11 and a radiation component 12. The radiation component 12 is disposed on the supporting component 11. The radiation component 12 includes four radiation units 120 arranged around the center of the support component 11, and the electrical length of each radiation unit 120 is a quarter of the wavelength corresponding to the center frequency of the radiation component 12. Two adjacent radiation units 120 are placed orthogonally and spaced apart from each other. Two of the four radiating units 120 are correspondingly provided with a feeding point 131.

The circularly polarized antenna device 10 of the embodiment of the present application realizes circularly polarized radiation by arranging four orthogonally placed radiation units 120. The four orthogonally placed radiation units 120 can increase the symmetry of the radiation pattern of the circular polarization antenna device 10 and improve the radiation performance of the circular polarization antenna device 10. Moreover, the electrical lengths of the four radiating units 120 are all a quarter of the wavelength corresponding to the center frequency of the radiating component 12, which can effectively reduce the size of the circularly polarized antenna device 10.

1, 8, 15 to 21, and 28 to 30 are front views of the circularly polarized antenna device 10 according to various embodiments of the present application. As shown in FIGS. 1, 8, 15 to 21, and 28 to 30, the circularly polarized antenna device 10 includes a supporting component 11 and a radiation component 12.

The supporting component 11 may be a PCB board, ceramics, LDS, PC/ABS plastic, etc. When the circular polarization antenna device 10 is installed on the movable platform 100 (shown in FIG. 31), the supporting component 11 may also be a component of the movable platform 100, such as a battery compartment, a battery cover, and the like. The supporting component may be a dielectric substrate, and the dielectric substrate may have a single-layer or multi-layer structure. The cross-sectional shape of the support assembly 11 can be a circle, a rectangle, a square, a pentagon, an octagon, etc., and it is not limited herein. The cross section of the support assembly 11 shown in FIGS. 1, 8, 15 to 21, and 28 to 30 is a square. In an example, the side length of the square may be one-half of the wavelength corresponding to the center frequency of the radiating component 12, but it is not limited to this.

The radiation assembly 12 includes four radiation units 120 arranged around the center of the support assembly 11. The electrical length of each radiating unit 120 is a quarter of the wavelength corresponding to the center frequency of the radiating component 12. Two adjacent radiation units 120 are placed orthogonally and spaced apart from each other. The distance between two adjacent radiation units 120 in the horizontal direction H is d1, and the distance between two adjacent radiation units 120 in the vertical direction V is d2. In one example, d1 is 0.5 mm and d2 is 1 mm. Of course, the values of d1 and d2 are not limited to this. For example, d1 can also be 0.35mm, 0.4mm, 0.45mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, etc., again without limitation; d2 can also be 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.05mm, 1.1mm, 1.15mm, etc., are not limited here. The radiation unit 120 may be a radiation branch or a radiation slit. Further, as shown in FIGS. 1, 8, 15 to 21, and 28 to 30, the radiation unit 120 may be a bent radiation branch or a bent radiation slot. The bent radiating stubs or radiating slots can further reduce the size of the circularly polarized antenna device 10. Of course, in other embodiments, the radiation unit 120 may also be a linear radiation branch or a linear radiation slit, which is not limited here. It should be noted that when the radiation unit 120 is a bent radiation branch or a bent radiation slot, the orthogonal placement disclosed in the present application can be understood as the bent radiation branch or each small segment in the bent radiation slot corresponds to Orthogonal placement, the parallel placement disclosed in the present application can be understood as the bent radiating branch or each small segment of the bent radiating gap is placed correspondingly in parallel.

Among them, in the circularly polarized antenna device 10 shown in FIGS. 1, 8, and 15 to 20, two of the four radiating units 120 are active radiating units 121, and the remaining two radiating units 120 are Passive radiation unit 122. The placement of the four radiating units 120 can be as follows: (1) Two active radiating units 121 are placed orthogonally, and two passive radiating units 122 are placed orthogonally. At this time, the feeding phase of the two active radiating units 121 The difference is 90°; (2) One of the active radiating unit 121 is placed orthogonally to one of the passive radiating unit 122, and the other active radiating unit 121 is placed orthogonally to the other passive radiating unit 122, and the two active radiation units are placed orthogonally. The units 121 are placed in parallel. At this time, the feeding phases of the two active radiating units 121 are the same, or the feeding phases of the two active radiating units 121 are different by 180°. In the circularly polarized antenna device 10 shown in FIGS. 21 and 28 to 30, the four radiating units 120 are all active radiating units 121. The placement of the four radiating units 120 may be as follows: any two adjacent active radiating units 121 are placed orthogonally. At this time, the feeding phases of any two adjacent active radiating units 120 are different by 90°.

The circular polarization antenna device 10 of each embodiment of the present application will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front view of a circularly polarized antenna device 10 according to an embodiment of the present application, and FIG. 2 is a side view of the circularly polarized antenna device 10 shown in FIG. 1. As shown in FIGS. 1 and 2, the radiation component 12 on the circularly polarized antenna device 10 includes four radiation units 120, of which two radiation units 120 are active radiation units 121, and the two active radiation units 121 are provided There are a feeding point 131 and a grounding point 132; the other two radiating units 120 are passive radiating units 122, and a grounding point 132 is provided on the two passive radiating units 122. Specifically, two active radiation units 121 are placed orthogonally, and two passive radiation units 122 are placed orthogonally. The distance between two adjacent radiation units 120 in the horizontal direction H is d1, and the distance between two adjacent radiation units 120 in the vertical direction V is d2. Each active radiating unit 121 includes two opposite ends, and each active radiating unit 121 is provided with a feeding point 131 and a grounding point 132. A feeding point 131 and a grounding point 132 in each active radiating unit 121 are jointly arranged at any end of the active radiating unit 121, and the feeding point 131 and the grounding point 132 are separated from each other. Each passive radiating unit 122 includes opposite ends, each passive radiating unit 122 is provided with a grounding point 132, and each passive radiating unit 122 is provided with a grounding point 132 on the passive radiating unit Either end of 122. The active radiating unit 120 is a PIFA antenna, and the height of the supporting component 11 is h.

FIG. 3 is a return loss diagram of the circularly polarized antenna device 10 shown in FIG. 1. As shown in FIG. 3, the circularly polarized antenna device 10 shown in FIG. 1 can cover the GPS frequency band and the GLONASS frequency band. Of course, the frequency band that the circular polarization antenna device 10 can cover can also be changed by changing the electrical length of the radiating unit 120. For example, the electrical length of the radiating unit 120 can be changed so that the circular polarization antenna device 10 can cover the Beidou frequency band and the 2.4 GHz frequency band. , 5GHz frequency band, etc., there are no restrictions here.

4 to 7 are directional diagrams of the circularly polarized antenna device 10 shown in FIG. 1. When the feed point 131 of the active radiating unit 121 extending in the vertical direction V is fed with a signal with a feeding phase of 90°, the feed point 131 of the active radiating unit 121 extending in the horizontal direction H is fed and fed For a signal with a phase of 0°, as shown in FIGS. 4 and 5, the circularly polarized antenna device 10 can realize right-handed circularly polarized radiation at this time. When the feed point 131 of the active radiating unit 121 extending in the vertical direction V is fed with a signal with a feed phase of 0°, the feed point 131 of the active radiating unit 121 extending in the horizontal direction H is fed and fed For a signal with a phase of 90°, as shown in Figs. 6 and 7, the circularly polarized antenna device 10 can realize left-handed circularly polarized radiation at this time.

It should be noted that, in the circularly polarized antenna device 10 shown in FIG. 1, the end of the active radiating unit 121 where the feed point 131 and the ground point 132 is located is close to the adjacent active radiating unit 121 that is not provided with the feeder. One end of the electrical point 131 and the grounding point 132, or the end of the passive radiating unit 122 adjacent to the electrical point 131 and the grounding point 132, which is not provided with the grounding point 132. In other embodiments, the end of the active radiating unit 121 provided with the feeding point 131 and the grounding point 132 may also be close to the end of the adjacent active radiating unit 121 provided with the feeding point 131 and the grounding point 132, Or close to the end of the passive radiating unit 122 adjacent to the passive radiating unit 122 where the ground point 132 is provided, which is not limited here. Similarly, the end of the passive radiating unit 122 provided with the grounding point 132 is close to the end of the adjacent active radiating unit 121 where the feeding point 131 and the grounding point 132 are not provided, or close to the adjacent passive radiating unit An end of 122 that is not provided with a ground point 132. In other embodiments, the end of the passive radiating unit 122 provided with the ground point 132 may also be close to the end of the adjacent active radiating unit 121 where the feeding point 131 and the ground point 132 are provided, or close to the end adjacent to it. One end of the passive radiating unit 122 provided with a ground point 132 is not limited here.

The circularly polarized antenna device 10 shown in FIG. 1 realizes circularly polarized radiation by arranging two active radiating units 121 and two passive radiating units 122, wherein the two active radiating units 121 can transmit energy by coupling. The passive radiation unit 122 is coupled to the adjacent passive radiation unit 122, so that the passive radiation unit 122 can also radiate energy. Compared with an antenna device with only two orthogonally placed active radiating units, the circular polarization antenna device 10 shown in FIG. 1 has better symmetrical radiation pattern and better circular polarization performance. In addition, the circularly polarized antenna device 10 shown in FIG. 1 has only two radiating units 120 that need to be fed, and requires fewer feeding ports (that is, the signal output terminal 22 shown in FIG. 32), and the circularly polarized antenna device The cost of 10 is lower. In addition, the circular polarization antenna device 10 shown in FIG. 1 uses a PIFA antenna as the active radiating unit 121, and the supporting component 11 has a certain height h. In this way, the Q value of the radiating unit 120 is lower, and more energy can be radiated. , Which is beneficial to increase the bandwidth of the circularly polarized antenna device 10.

FIG. 8 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application, and FIG. 9 is a side view of the circularly polarized antenna device 10 shown in FIG. 8. The structure of the circularly polarized antenna device 10 shown in FIG. 8 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. In the four radiating units 120, one active radiating unit 121 is placed orthogonally to one passive radiating unit 122, the other active radiating unit 121 is placed orthogonally to the other passive radiating unit 122, and two The active radiation units 121 are placed in parallel. At this time, the feeding phases of the two active radiating units 121 are the same or 180° different from each other.

FIG. 10 is a return loss diagram of the circularly polarized antenna device 10 shown in FIG. 8. As shown in FIG. 10, the circularly polarized antenna device 10 shown in FIG. 8 can cover the GPS frequency band and the GLONASS frequency band. Of course, the frequency band that the circular polarization antenna device 10 can cover can also be changed by changing the electrical length of the radiating unit 120. For example, the electrical length of the radiating unit 120 can be changed so that the circular polarization antenna device 10 can cover the Beidou frequency band and the 2.4 GHz frequency band. , 5GHz frequency band, etc., there are no restrictions here.

11 to 14 are radiation patterns of the circularly polarized antenna device 10 shown in FIG. 8. When the feed phases of the two active radiating units 121 are in the same phase, for example, both are 0° or both are 180°, as shown in FIGS. 11 and 12, the circularly polarized antenna device 10 can implement right-handed circular poles. Radiation. When the feeding phases of the two active radiating units 121 are different by 180°, for example, the feeding phase of one active radiating unit 121 is 0°, and the feeding phase of the other active radiating unit 121 is 180°, then As shown in FIG. 13 and FIG. 14, at this time, the circularly polarized antenna device 10 can realize left-handed circularly polarized radiation.

The circularly polarized antenna device 10 shown in FIG. 8 realizes circularly polarized radiation by arranging two active radiating units 121 and two passive radiating units 122, wherein the two active radiating units 121 can transmit energy through coupling. The passive radiation unit 122 is coupled to the adjacent passive radiation unit 122, so that the passive radiation unit 122 can also radiate energy. Compared with an antenna device with only two orthogonally placed active radiating units, the circular polarization antenna device 10 shown in FIG. 8 has better radiation pattern symmetry and better circular polarization performance. In addition, the circularly polarized antenna device 10 shown in FIG. 8 has only two radiating units 120 that need to be fed, and requires fewer feeding ports, and the cost of the circularly polarized antenna device 10 is lower. In addition, the circularly polarized antenna device 10 shown in FIG. 8 uses a PIFA antenna as the active radiating unit 121, and the supporting component has a certain height. In this way, the Q value of the radiating unit 120 is lower, and more energy can be radiated. It is beneficial to increase the bandwidth of the circularly polarized antenna device 10.

FIG. 15 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 15 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. Among them, the four radiating units 120 are all loop antennas. Each active radiating unit 121 includes opposite ends, each active radiating unit 121 is provided with a feeding point 131 and a grounding point 132, and a feeding point 131 is provided on the side of the active radiating unit 121. At one end, a ground point 132 is provided at the other end of the active radiating unit 121. Each passive radiating unit 122 includes opposite ends, and each passive radiating unit 122 is provided with two ground points 132, and the two ground points 132 are respectively located at two opposite ends of the passive radiating unit 122. end. By feeding two active radiating units 121 with signals whose feeding phases differ by 90°, the circularly polarized antenna device 10 shown in FIG. 15 can realize circularly polarized radiation.

Since in the circularly polarized antenna device 10 shown in FIG. 15, the four radiating elements 120 are all loop loop antennas, the loop loop antenna has a small input impedance and a high Q value. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the loop antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 1, the circularly polarized antenna device 10 shown in FIG. 15 implements circularly polarized radiation by arranging two active radiation units 121 and two passive radiation units 122. The radiation pattern has better symmetry and better circular polarization performance. Moreover, the circularly polarized antenna device 10 shown in FIG. 15 has only two radiating units 120 that need to be fed, and requires fewer feeding ports, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 16 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 16 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. 15. The main difference between the two is: the circularly polarized antenna device 10 shown in FIG. In the four radiating units 120, one active radiating unit 121 is placed orthogonally to one passive radiating unit 122, the other active radiating unit 121 is placed orthogonally to the other passive radiating unit 122, and two The active radiation units 121 are placed in parallel. At this time, the feeding phases of the two active radiating units 121 are the same or 180° different from each other. By feeding two active radiating units 121 with signals with the same feeding phase or a 180° phase difference, the circularly polarized antenna device 10 shown in FIG. 16 can realize circularly polarized radiation.

Similar to the circularly polarized antenna device 10 shown in FIG. 15, in the circularly polarized antenna device 10 shown in FIG. 16, an input impedance matching circuit can also be added between the feeding port and the feeding point 131 to optimize the loop The input impedance characteristic of the loop antenna reduces the Q value and increases the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 15, the circularly polarized antenna device 10 shown in FIG. 16 implements circularly polarized radiation by providing two active radiation units 121 and two passive radiation units 122, which The radiation pattern has better symmetry and better circular polarization performance. Moreover, the circularly polarized antenna device 10 shown in FIG. 16 has only two radiating units 120 that need to be fed, and fewer feeding ports are required, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 17 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 17 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. Among them, the active radiating unit 121 is a monopole antenna. Each active radiating unit 121 is provided with a feeding point 131, and each passive radiating unit 122 is provided with a grounding point 132. Specifically, each active radiating unit 121 includes opposite ends, each active radiating unit 121 is provided with a feeding point 131, and a feeding point 131 is provided at any end of the active radiating unit 121 . Each passive radiating unit 122 includes opposite ends, each passive radiating unit 122 is provided with a ground point 132, and a ground point 132 is provided at any end of the passive radiating unit 122. By inputting signals whose feeding phases are different by 90° to the two active radiation units 121, the circularly polarized antenna device 10 shown in FIG. 17 can realize circularly polarized radiation.

Since in the circularly polarized antenna device 10 shown in FIG. 17, the active radiating unit 121 is a monopole antenna, the input impedance of the monopole antenna is small, and the Q value is high. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the monopole antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 1, the circularly polarized antenna device 10 shown in FIG. 17 realizes circularly polarized radiation by providing two active radiation units 121 and two passive radiation units 122, which The radiation pattern has better symmetry and better circular polarization performance. Moreover, the circularly polarized antenna device 10 shown in FIG. 17 has only two radiating units 120 that need to be fed, and requires fewer feeding ports, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 18 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 18 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. 17. The difference between the two is mainly: the circularly polarized antenna device 10 shown in FIG. In the four radiating units 120, one active radiating unit 121 is placed orthogonally to one passive radiating unit 122, the other active radiating unit 121 is placed orthogonally to the other passive radiating unit 122, and two The active radiation units 121 are placed in parallel. At this time, the feeding phases of the two active radiating units 121 are the same or 180° different from each other. By inputting signals with the same feeding phase or a 180° phase difference to the two active radiation units 121, the circularly polarized antenna device 10 shown in FIG. 18 can realize circularly polarized radiation.

Similar to the circularly polarized antenna device 10 shown in FIG. 17, in the circularly polarized antenna device 10 shown in FIG. The input impedance characteristic of the pole antenna reduces the Q value and increases the bandwidth of the circularly polarized antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 17, the circularly polarized antenna device 10 shown in FIG. 18 implements circularly polarized radiation by providing two active radiation units 121 and two passive radiation units 122, which The symmetry of the radiation pattern is better, and the circular polarization performance is better. Moreover, the circularly polarized antenna device 10 shown in FIG. 18 has only two radiating units 120 that need to be fed, and fewer feeding ports are required, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 19 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 19 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. Among them, the four radiating units 120 are four slots opened on the metal sheet 14, that is, the four radiating units 120 are slot antennas, and the metal sheet 14 is disposed on the first surface of the supporting assembly 11 (not shown). Each active radiating unit 121 is correspondingly provided with a feeding point 131 and a grounding point 132, and the passive radiating unit 122 is not provided with a feeding point 131 and a grounding point 132. Specifically, each active radiating unit 121 includes opposite ends, and each active radiating unit 121 is correspondingly provided with a feeding point 131 and a grounding point 132. A feeding point 131 and a grounding point 132 are arranged at one end of the active radiating unit 121, and the feeding point 131 and the grounding point 132 are respectively located on both sides of the end. By inputting signals whose feeding phases are different by 90° to the two active radiation units 121, the circularly polarized antenna device 10 shown in FIG. 19 can realize circularly polarized radiation. In an example, the two active radiating units 121 shown in FIG. 19 can be fed through two coaxial lines respectively, the inner core of the coaxial line is connected to the feed point 131, and the outer skin of the coaxial line is connected to the ground point. .

Since the four radiating elements 120 in the circular polarization antenna device 10 shown in FIG. 19 are all slot antennas, the input impedance of the slot antenna antenna is small, and the Q value is high. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the slot antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

In other examples, when the active radiating unit 121 is a slot antenna, a microstrip line can also be used to feed the corresponding slot of the active radiating unit 121. The microstrip line may be provided on a second surface of the support assembly 11 opposite to the first surface. For example, the support assembly 11 may include a layer of dielectric substrate (the material of the dielectric substrate is, for example, FR-4 substrate, etc.), the metal sheet 14 may be a copper metal sheet, and the metal sheet 14 may be printed by an antenna, such as etching, The electroplating method or the like is attached to one surface of the dielectric substrate, and the microstrip line is provided on the side of the dielectric substrate away from the metal sheet 14.

In other examples, when the active radiating unit 121 is a slot antenna, a microstrip line can also be used to feed the corresponding slot of the active radiating unit 121. For example, the supporting assembly 11 may include a layer of a first dielectric substrate, and the circular polarization antenna device 10 may further include a second dielectric substrate and a grounded metal layer. Along the direction perpendicular to the metal sheet 14, the metal sheet 14, the first dielectric substrate, the microstrip line, the second dielectric substrate, and the grounded metal layer are arranged in sequence.

Similar to the circularly polarized antenna device 10 shown in FIG. 1, the circularly polarized antenna device 10 shown in FIG. 19 implements circularly polarized radiation by providing two active radiation units 121 and two passive radiation units 122, which The symmetry of the radiation pattern is better, and the circular polarization performance is better. Moreover, the circularly polarized antenna device 10 shown in FIG. 19 has only two radiating units 120 that need to be fed, and requires fewer feeding ports, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 20 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 20 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. In the four radiating units 120, one active radiating unit 121 is placed orthogonally to one passive radiating unit 122, the other active radiating unit 121 is placed orthogonally to the other passive radiating unit 122, and two The active radiation units 121 are placed in parallel. At this time, the feeding phases of the two active radiating units 121 are the same or 180° different from each other. By feeding two active radiation units 121 with signals with the same feeding phase or a 180° phase difference, the circularly polarized antenna device 10 shown in FIG. 20 can realize circularly polarized radiation.

Similar to the circularly polarized antenna device 10 shown in FIG. 19, in the circularly polarized antenna device 10 shown in FIG. 20, an input impedance matching circuit can also be added between the feeding port and the feeding point 131 to optimize the gap. The input impedance characteristic of the antenna reduces the Q value and increases the bandwidth of the circularly polarized antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 19, the circularly polarized antenna device 10 shown in FIG. 20 realizes circularly polarized radiation by providing two active radiation units 121 and two passive radiation units 122, which The symmetry of the radiation pattern is better, and the circular polarization performance is better. Moreover, the circularly polarized antenna device 10 shown in FIG. 20 only has two radiating units 120 that need to be fed, and requires fewer feeding ports, and the cost of the circularly polarized antenna device 10 is lower.

FIG. 21 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application, and FIG. 22 is a side view of the circularly polarized antenna device 10 shown in FIG. 21. As shown in FIGS. 21 and 22, the radiation component 12 on the circularly polarized antenna device 10 includes four radiation units 120, and the four radiation units 120 are all active radiation units 121, and any two adjacent active radiation units 121 are placed orthogonally, and the feeding phases of any two adjacent active radiating units 121 are different by 90°. Each active radiating unit 120 is provided with a feeding point 131 and a grounding point 132. Specifically, the four active radiation units 121 are placed orthogonally. The distance between two adjacent radiation units 120 in the horizontal direction H is d1, and the distance between two adjacent radiation units 120 in the vertical direction V is d2. Each active radiating unit 121 includes two opposite ends, and each active radiating unit 121 is provided with a feeding point 131 and a grounding point 132. A feeding point 131 and a grounding point 132 in each active radiating unit 121 are jointly arranged at any end of the active radiating unit 121, and the feeding point 131 and the grounding point 132 are separated from each other. The four radiating units 120 may all be PIFA antennas, and the height of the supporting component 11 is h.

FIG. 23 is a return loss diagram of the circularly polarized antenna device 10 shown in FIG. 21. As shown in FIG. 23, the circularly polarized antenna device 10 shown in FIG. 21 can cover the GPS frequency band and the GLONASS frequency band. Of course, the frequency band that the circular polarization antenna device 10 can cover can also be changed by changing the electrical length of the radiating unit 120. For example, the electrical length of the radiating unit 120 can be changed so that the circular polarization antenna device 10 can cover the Beidou frequency band and the 2.4 GHz frequency band. , 5GHz frequency band, etc., there are no restrictions here.

24 to 27 are radiation patterns of the circular polarization antenna device 10 shown in FIG. 21. Assuming that the signal fed from the feeding point 131 of the active radiating unit 121 extending in the vertical direction V and close to the right side of the support assembly 11 (see FIG. 21, the same below) has a feeding phase of 0°, along the horizontal direction The signal fed by the feed point 131 of the active radiating unit 121 that extends and is close to the upper part of the support assembly 11 (viewed from FIG. 21, the same below) has a feed phase of 90°, extends along the vertical direction V and is close to the support The feed phase of the signal fed from the feed point 131 of the active radiating unit 121 on the left side of the component 11 (viewed from FIG. 21, the same below) is 180°, extends in the horizontal direction H and is close to the bottom of the support component 11 (From Fig. 21, the same below) the feed phase of the signal fed from the feed point 131 of the active radiating unit 121 is 270°, as shown in Figs. 24 and 25, the circularly polarized antenna device 10 can realize left-handed circularly polarized radiation. Assuming that the feed phase of the signal fed by the feed point 131 of the active radiating unit 121 extending in the vertical direction V and close to the right side of the support assembly 11 is 270°, and the signal extending in the horizontal direction H and close to the upper side of the support assembly 11 The signal fed from the feed point 131 of the active radiating unit 121 has a feed phase of 180°, extends in the vertical direction V and is close to the signal fed from the feed point 131 of the active radiating unit 121 on the left side of the support assembly 11 The feed phase of the signal fed by the feed point 131 of the active radiating unit 121 extending in the horizontal direction H and close to the bottom of the support assembly 11 is 0°, as shown in Figs. 26 and 27 As shown, at this time, the circularly polarized antenna device 10 can realize right-handed circularly polarized radiation.

It should be noted that in the circularly polarized antenna device 10 shown in FIG. 21, the end of the active radiating unit 121 where the feeding point 131 and the grounding point 132 is located is close to the adjacent active radiating unit 121 that is not provided with the feeding point. One end of the electrical point 131 and the ground point 132. In other embodiments, the end of the active radiating unit 121 provided with the feeding point 131 and the grounding point 132 may also be close to the end of the adjacent active radiating unit 121 provided with the feeding point 131 and the grounding point 132, There is no restriction here.

The circularly polarized antenna device 10 shown in FIG. 21 realizes circularly polarized radiation by arranging four active radiation units 121. Compared with the circularly polarized antenna device 10 shown in FIG. 1, the circularly polarized antenna device 10 shown in FIG. 21 has better symmetrical radiation pattern and better circular polarization performance. In addition, the circularly polarized antenna device 10 shown in FIG. 21 uses a PIFA antenna as the radiating unit 120, and the supporting component 11 has a certain height. In this way, the Q value of the radiating unit 120 is lower, and more energy can be radiated, which is beneficial to The bandwidth of the circularly polarized antenna device 10 is increased.

FIG. 28 is a front view of a circular polarization antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 28 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. 21, and the difference between the two is mainly: the circularly polarized antenna device 10 shown in FIG. 28 Among them, the four radiating units 120 are all loop antennas. Each active radiating unit 121 includes opposite ends, each active radiating unit 121 is provided with a feeding point 131 and a grounding point 132, and a feeding point 131 is provided on the side of the active radiating unit 121. At one end, a ground point 132 is provided at the other end of the active radiating unit 121. By feeding signals to four active radiating units 121, and the feeding phases of the signals fed by any two adjacent active radiating units 121 are different by 90°, the circularly polarized antenna device shown in FIG. 28 can be made 10 Realize circularly polarized radiation.

Since in the circularly polarized antenna device 10 shown in FIG. 28, the four radiating elements 120 are all loop loop antennas, the loop loop antenna has a small input impedance and a high Q value. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the loop antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 21, the circularly polarized antenna device 10 shown in FIG. 28 realizes circularly polarized radiation by arranging four active radiating units 121, and its radiation pattern has better symmetry. , Circular polarization performance is better.

FIG. 29 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 29 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. 21, and the difference between the two is mainly: the circularly polarized antenna device 10 shown in FIG. 29 Among them, the four radiating units 120 are all monopole antennas. Each active radiating unit 121 is provided with a feeding point 131. Specifically, each active radiating unit 121 includes opposite ends, each active radiating unit 121 is provided with a feeding point 131, and a feeding point 131 is provided at any end of the active radiating unit 121 . By feeding signals to four active radiating units 121, and the feeding phases of the signals fed by any two adjacent active radiating units 121 are different by 90°, the circularly polarized antenna device shown in FIG. 29 can be made 10 Realize circularly polarized radiation.

Since the four radiating elements 120 in the circularly polarized antenna device 10 shown in FIG. 29 are all monopole antennas, the input impedance of the monopole antenna is small, and the Q value is high. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the monopole antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 21, the circularly polarized antenna device 10 shown in FIG. 29 realizes circularly polarized radiation by providing four active radiation units 121, and its radiation pattern has better symmetry. , Circular polarization performance is better.

FIG. 30 is a front view of a circularly polarized antenna device 10 according to another embodiment of the present application. The structure of the circularly polarized antenna device 10 shown in FIG. 30 is substantially the same as the structure of the circularly polarized antenna device 10 shown in FIG. 21, and the difference between the two is mainly: the circularly polarized antenna device 10 shown in FIG. 20 Among them, the four radiating units 120 are four slots opened on the metal sheet 14, that is, the four radiating units 120 are slot antennas, and the metal sheet 14 is disposed on the first surface of the supporting assembly 11 (not shown). Each active radiating unit 121 is correspondingly provided with a feeding point 131 and a grounding point 132. Specifically, each active radiating unit 121 includes opposite ends, and each active radiating unit 121 is correspondingly provided with a feeding point 131 and a grounding point 132. A feeding point 131 and a grounding point 132 are arranged at one end of the active radiating unit 121, and the feeding point 131 and the grounding point 132 are respectively located on both sides of the end. By feeding signals to four active radiating units 121, and the feeding phases of the signals fed by any two adjacent active radiating units 121 are different by 90°, the circularly polarized antenna device shown in FIG. 28 can be made 10 Realize circularly polarized radiation. In an example, the four active radiating units 121 shown in FIG. 30 can be fed through four coaxial lines respectively, the inner core of the coaxial line is connected to the feed point 131, and the outer skin of the coaxial line is connected to the ground point. .

Since in the circularly polarized antenna device 10 shown in FIG. 30, the four radiating units 120 are all slot antennas, the input impedance of the slot antenna antenna is small, and the Q value is high. Therefore, an input impedance matching circuit can be further added between the feeding port and the feeding point 131 to optimize the input impedance characteristics of the slot antenna, reduce the Q value, and increase the bandwidth of the circular polarization antenna device 10.

Similar to the circularly polarized antenna device 10 shown in FIG. 21, the circularly polarized antenna device 10 shown in FIG. 30 implements circularly polarized radiation by providing four active radiation units 121, and its radiation pattern has better symmetry. , Circular polarization performance is better.

Referring to FIG. 31, the embodiment of the present application also provides a movable platform 100. The movable platform 100 may be an unmanned aerial vehicle, an unmanned vehicle, an unmanned ship, etc., which is not limited here. The movable platform 100 includes a phase shifting unit 20 and the circularly polarized antenna device 10 described in any one of the above embodiments. As shown in FIGS. 31 and 32, the phase shifting unit 20 includes a signal input terminal 21 and a signal output terminal 22. The feeding point 131 of the circular polarization antenna device 10 is correspondingly connected to the signal output terminal 22.

In some embodiments, as shown in FIGS. 1 and 32, when the radiation component 12 includes two active radiation units 121 and two passive radiation units 122, the phase shift unit 20 includes a signal input terminal 21 and two A signal output terminal 122. The two signal output terminals 122 are respectively connected to the two feeding points 131 of the two active radiation units 121.

In an example, the phase shifting unit 20 may be a digital phase shifter (not shown). For the circularly polarized antenna device 10 shown in FIG. 1, FIG. 8, and FIG. 15 to FIG. 20, the two signal output terminals 22 of the digital phase shifter output signals with a feed phase difference of 90°. For the circularly polarized antenna device 10 shown in FIGS. 21, 28 to 30, the two signal output terminals 22 of the digital phase shifter output signals with the same feeding phase or a 180° phase difference.

In another example, the phase shifting unit 20 may be an electric bridge 23. For the circularly polarized antenna device 10 shown in Figure 1, Figure 15, Figure 17 and Figure 19, the bridge 23 is a 90° bridge, and one signal output terminal 22 of the 90° bridge outputs a signal with a feed phase of 0° , The other signal output terminal 22 outputs a signal with a feed phase of 90°. For the circularly polarized antenna device 10 shown in Figs. 8, 16, 18 and 20, the bridge 23 is a 180° bridge, and one signal output terminal 22 of the 180° bridge outputs a signal with a feed phase of 0° , The other signal output terminal 22 outputs a signal with a feed phase of 180°.

Further, when the phase shifting unit 20 is an electric bridge 23, the phase shifting unit 20 may further include a switch 24. The switch 24 is arranged between the signal input terminal 21 and the signal output terminal 22 and is used to switch between the left-hand circular polarization characteristic and the right-hand circular polarization characteristic of the circularly polarized antenna device 10. Specifically, please refer to Figure 32, assuming that the switch 24 on the top (viewed from Figure 32, the same below) is connected to the signal output terminal 22 above, and the switch 24 on the bottom (viewed from Figure 32, the same below) is connected to the signal output below. When the terminal 22, the circularly polarized antenna device 10 exhibits left-handed circular polarization characteristics; when the upper switch 24 is connected to the lower signal output terminal 22, and the lower switch 24 is connected to the upper signal output terminal 22, the circularly polarized antenna device 10 presents the right Rotary polarization characteristics. Then, when the movable platform 100 is working, the circular polarization characteristic of the circular polarization antenna device 10 can be changed by changing the signal output terminal 22 connected to the switch 24. It can be understood that taking the movable platform 100 as an unmanned aerial vehicle as an example, when there are two flying drones in the same scene at the same time, the circular polarization characteristics of the circularly polarized antenna device 10 in the two unmanned aerial vehicles are the same. Similarly, the signals sent or received by the two are prone to interference. Therefore, the circular polarization characteristics of the internal circular polarization antenna device 10 of one of the UAVs can be changed to solve the interference problem between the two UAVs.

In some embodiments, as shown in FIGS. 20, 29 to 30, and 33, when the radiation component 12 includes four active radiation units 121, the phase shift unit 20 includes one signal input terminal 21 and four active radiation units 121. Signal output terminal 122. The four signal output terminals 122 are respectively connected to the two feeding points 131 of the four active radiation units 121.

In an example, the phase shifting unit 20 may be a digital phase shifter (not shown). Among the four signal output terminals 22 of the digital phase shifter, one signal output terminal 22 outputs a signal with a feed phase of 0°, a signal output terminal 22 outputs a signal with a feed phase of 90°, and a signal output terminal 22 outputs a signal with a feed phase of 90°. For a signal with an electrical phase of 180°, the remaining signal output terminal 22 outputs a signal with a feeding phase of 270°.

In another example, the phase shifting unit 20 may be an electric bridge 23. The bridge 23 includes a 180° bridge 231 and two 90° bridges 232. The 180° bridge 231 outputs a signal with a feed phase of 0° to one of the 90° bridges 232, and outputs a feed phase of 180 ° signal to another 90° bridge 232. One signal output terminal 22 of the 90° bridge 232 that receives a signal with a feeding phase of 0° outputs a signal with a feeding phase of 0°, and the other signal output terminal 22 outputs a signal with a feeding phase of 90°. One signal output terminal 22 of the 90° bridge 232 that receives a signal with a feeding phase of 180° outputs a signal with a feeding phase of 180°, and the other signal output terminal 22 outputs a signal with a feeding phase of 270°.

Further, when the phase shifting unit 20 is an electric bridge 23, the phase shifting unit 20 may further include a switch 24. The switch 24 is arranged between the signal input terminal 21 and the signal output terminal 22 and is used to switch between the left-hand circular polarization characteristic and the right-hand circular polarization characteristic of the circularly polarized antenna device 10. Specifically, similar to the embodiment shown in FIG. 32, in the embodiment shown in FIG. 33, when the circular polarization characteristics of the circular polarization antenna device 10 need to be changed, only the switches 24 and the signal output terminals 22 need to be changed. The connection relationship is sufficient, so I won’t repeat it here.

In the description of this specification, reference to the description of the terms "certain embodiments", "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, for example two, three, unless otherwise specifically defined.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application. A person of ordinary skill in the art can comment on the foregoing within the scope of the present application. The embodiments are subject to changes, modifications, substitutions and modifications, and the scope of this application is defined by the claims and their equivalents.

Claims

A circularly polarized antenna device is characterized in that it comprises:

Support components; and

A radiation component, the radiation component is disposed on the support component, the radiation component includes four radiation units arranged around the center of the support component, and the electrical length of each radiation unit is the center frequency of the radiation component Corresponding to a quarter of the wavelength, two adjacent radiating units are placed orthogonally and spaced apart from each other, and at least two of the four radiating units are correspondingly provided with feeding points.
The circularly polarized antenna device according to claim 1, wherein two of the four radiation units are active radiation units, and the remaining two radiation units are passive radiation units.
The circularly polarized antenna device according to claim 2, wherein each of the active radiating units is provided with the feeding point and the grounding point, and each of the passive radiating units is provided with the grounding point .
4. The circularly polarized antenna device according to claim 3, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with a feed point and a ground point , One said feeding point and one said grounding point are arranged at any end of said active radiating unit, and said feeding point and said grounding point are separated from each other;

The passive radiating unit includes two opposite ends, the passive radiating unit is provided with a ground point, and the ground point is provided at any end of the passive radiating unit.
4. The circularly polarized antenna device according to claim 3, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with a feed point and a ground point , One of the feeding points is set at one end of the active radiating unit, and one of the grounding points is set at the other end of the active radiating unit;

The passive radiating unit includes two opposite ends, and the passive radiating unit is provided with two ground points, and the two ground points are respectively located at the opposite ends of the passive radiating unit.
The circularly polarized antenna device according to claim 2, wherein each of the active radiating elements is provided with the feeding point, and each of the passive radiating elements is provided with a grounding point.
The circularly polarized antenna device according to claim 6, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with one feeding point and one feeding point. The point is set at any end of the active radiating unit;

The passive radiating unit includes two opposite ends, the passive radiating unit is provided with a ground point, and the ground point is provided at any end of the passive radiating unit.
The circularly polarized antenna device according to claim 2, wherein each active radiating unit is correspondingly provided with the feeding point and the grounding point.
8. The circularly polarized antenna device according to claim 8, wherein the four radiating units are four slots opened in a metal sheet, and the metal sheet is disposed on the first surface of the supporting component;

The active radiating unit includes two opposite ends, and the active radiating unit is provided with a feeding point and a grounding point correspondingly, and the feeding point and the grounding point are arranged at all At one end of the active radiating unit, one of the feeding point and one of the grounding points are respectively located on both sides of the end; or

A microstrip line is provided on a second surface of the support assembly opposite to the first surface, and the microstrip line is used to feed the gap corresponding to the active radiation unit.
The circularly polarized antenna device according to any one of claims 2-9, wherein the two active radiating elements are placed orthogonally, the two passive radiating elements are placed orthogonally, and the two The feed phase difference of the active radiating unit is 90°; or

One of the active radiating units is placed orthogonal to one of the passive radiating units, the other active radiating unit is placed orthogonally to the other passive radiating units, and two of the active radiating units They are placed in parallel, and the feed phases of the two active radiation units are the same or 180° different.
The circularly polarized antenna device according to claim 1, wherein the four radiating units are all active radiating units.
The circularly polarized antenna device according to claim 11, wherein each active radiating unit is provided with the feeding point and the grounding point.
The circularly polarized antenna device according to claim 12, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with one feeding point and one grounding point One said feeding point and one said grounding point are arranged at any end of said active radiating unit, and said feeding point and said grounding point are separated from each other.
The circularly polarized antenna device according to claim 13, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with a feed point and a ground point One of the feeding points is arranged at one end of the active radiating unit, and one of the grounding points is arranged at the other end of the active radiating unit.
The circularly polarized antenna device according to claim 11, wherein each active radiating unit is provided with the feeding point.
The circularly polarized antenna device according to claim 15, wherein the active radiating unit includes two opposite ends, and the active radiating unit is provided with one feeding point and one feeding point. The point is set at any end of the active radiating unit.
The circularly polarized antenna device according to claim 11, wherein each active radiating unit is correspondingly provided with a feeding point and a grounding point.
17. The circularly polarized antenna device according to claim 17, wherein the four radiating units are four slits opened in a metal sheet, and the metal sheet is disposed on the first surface of the supporting component;

The active radiating unit includes two opposite ends, the active branch radiating unit is provided with a feed point and a ground point correspondingly, and the feed point and the ground point are provided at At one end of the active radiating unit, one of the feeding point and one of the grounding points are respectively located on both sides of the end; or

A microstrip line is provided on a second surface of the support assembly opposite to the first surface, and the microstrip line is used to feed the gap corresponding to the active radiation unit.
The circularly polarized antenna device according to any one of claims 11-18, wherein any two adjacent active radiation units are placed orthogonally, and any two adjacent active radiation units The feed phases of the units differ by 90°.
The circularly polarized antenna device according to claim 1, wherein the supporting component is a dielectric substrate, and the dielectric substrate has a single-layer or multi-layer structure.
The circularly polarized antenna device according to claim 1, wherein the radiating element is a bent branch or a bent slot.
A movable platform, characterized in that it comprises:

A phase shifting unit, the phase shifting unit including a signal input terminal and a signal output terminal; and

The circularly polarized antenna device according to any one of claims 1-21, wherein the feeding point of the circularly polarized antenna device is correspondingly connected to the signal output terminal.
The movable platform according to claim 22, wherein when the radiation component includes two active radiation units and two passive radiation units, the phase shift unit includes a signal input terminal and two signal input terminals. The output terminal.
The movable platform according to claim 22, wherein when the radiating component includes four active radiating units, the phase shifting unit includes one signal input terminal and four signal output terminals.
The movable platform according to claim 22, wherein the phase shifting unit further comprises a switch, the switch is arranged between the signal input terminal and the signal output terminal for realizing the circular pole Switching between left-hand circular polarization characteristics and right-hand circular polarization characteristics of the antenna device.