Circularly polarized yagi antenna

Abstract

The utility model provides a circularly polarized yagi antenna which comprises a first antenna array element and a second antenna array element, the first antenna array element and the second antenna array element are connected through an antenna bakelite connecting rod, a supporting rod is arranged below the antenna bakelite connecting rod and used for supporting the antenna bakelite connecting rod, and a combiner power divider is arranged on the antenna bakelite connecting rod. A signal input port of the combiner power divider is respectively connected with the first antenna array element and the second antenna array element through transmission lines, the first antenna array element and the second antenna array element respectively comprise a plurality of groups of oscillators, and the plurality of groups of oscillators are connected through an antenna main rod perpendicular to the horizontal plane. The plurality of groups of vibrators comprise at least one director vibrator group, at least one feed vibrator group and at least one reflector vibrator group from top to bottom in sequence. The circularly polarized yagi antenna provided by the utility model adopts bridge feed, the antenna gain is greater than 15dBi, the antenna axial ratio is less than 3dB, and the circularly polarized yagi antenna has a high-gain and high-directivity left-hand circular polarization characteristic at 320MHz.

Description

TECHNICAL FIELD

[0001] The application relates to the field of satellite communication equipment, in particular to a circularly polarized Yagi antenna. BACKGROUND

[0002] In a satellite communication link, it mainly consists of three parts of terminal users, satellites and ground stations. The main function of the ground station is to receive satellite backhaul data and then transmit the received data back to the background system. Therefore, the performance requirements of the ground station receiving system for its supporting antenna are relatively high. The supporting antenna usually needs to have high gain, that is, high directivity. The supporting antenna is erected on a turntable, and the ground station antenna is driven to rotate by the turntable, so as to track the azimuth and elevation angles of the satellite in real time.

[0003] In the prior art, when a linearly polarized Yagi antenna receives a left-hand circularly polarized signal of a low-orbit satellite constellation, the link performance is lost by 3dB due to polarization mismatch. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the application provides a circularly polarized Yagi antenna, and the specific structure comprises: a first antenna array element and a second antenna array element, the first antenna array element and the second antenna array element are connected through an antenna wood connecting rod, a supporting rod is arranged below the antenna wood connecting rod, the supporting rod is used for supporting the antenna wood connecting rod, a combining power divider is arranged on the antenna wood connecting rod, the combining power divider is connected with the first antenna array element and the second antenna array element through transmission lines respectively, and the first antenna array element and the second antenna array element respectively comprise a plurality of groups of dipoles, the plurality of groups of dipoles are connected through an antenna main rod perpendicular to a horizontal plane, and the plurality of groups of dipoles comprise at least one group of director dipoles, at least one group of feed dipoles and at least one group of reflector dipoles from top to bottom; the first antenna array element and the second antenna array element respectively comprise a bridge box, the bridge box is arranged on the antenna main rod and close to the group of feed dipoles, and at least one feed dipole in the group of feed dipoles is connected with the bridge box; the positive electrode of the feed dipole is insulated from the antenna main rod, and the negative electrode of the feed dipole is connected with the antenna main rod to realize common ground.

[0005] By adopting the above specific structure, the feed mode of the circularly polarized Yagi antenna provided by the application adopts a bridge design, realizes left-hand circularly polarized antenna design, matches the polarization of the satellite, and is beneficial to receiving performance. By adopting the bridge feed mode, the size of the feed network of the circularly polarized antenna can be effectively reduced. At the same time, the Yagi antenna with double units can have high gain and high directivity, and the performance of receiving satellite signals is better.

[0006] As a possible implementation, the bridge box comprises a bridge mainboard, the bridge mainboard is provided with a bridge chip, the bridge chip is electrically connected with the bridge mainboard, and the bridge mainboard comprises: a mainboard ground, which is used for providing a grounding pin for the bridge mainboard; an input pin, which is connected with the feed oscillator through a connecting device; and an output pin, which is electrically connected with the hybrid power divider through the transmission line.

[0007] As a possible implementation, the transmission line is a coaxial line, the coaxial line comprises a wire core and a transmission line sheath, the wire core and the transmission line sheath are insulated from each other, the wire core is electrically connected with the output pin, and the transmission line sheath is connected with the mainboard ground.

[0008] As a possible implementation, the input pin comprises a 0-degree pin and a 90-degree pin, and the 0-degree pin and the 90-degree pin are respectively electrically connected with positive circuits of two feed oscillators.

[0009] As a possible implementation, the antenna main rod is a metal square tube, the metal square tube is a hollow structure, and the coaxial line passes through the metal square tube.

[0010] As a possible implementation, the connecting device is a Z-shaped metal part or a strip-shaped metal part, one end of the Z-shaped metal part is electrically connected with the feed oscillator through a hoop, the other end of the Z-shaped metal part extends into the bridge box and is electrically connected with the 0-degree pin or the 90-degree pin, one end of the strip-shaped metal part is electrically connected with the feed oscillator through a hoop, and the other end of the strip-shaped metal part extends into the bridge box and is electrically connected with the 0-degree pin or the 90-degree pin.

[0011] As a possible implementation, an insulating partition is arranged between the Z-shaped metal part and the bridge box. An insulating partition is arranged between the strip-shaped metal part and the bridge box.

[0012] As a possible implementation, a plurality of groups of the oscillators are made of aluminum pipes, and the length and the spacing of each group of the oscillators are specific values.

[0013] As a possible implementation, the hybrid power divider comprises a signal output port, and the signal output port is electrically connected with a high-speed terminal communication module of a ground station.

[0014] As a possible implementation, the support rod is provided with a turntable at the top end, and the antenna balsa wood connecting rod is fixedly arranged on the turntable. BRIEF DESCRIPTION OF DRAWINGS

[0015] The various technical features of the present application and the relationships between them will be further illustrated below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional in the technical field to which the present application belongs and are not essential for understanding and implementing the present application, or additional technical features are shown, which are not essential for understanding and implementing the present application. That is, the combination of various technical features shown in the drawings is not used to limit the present application. In addition, the same reference signs refer to the same contents throughout the present application. The specific drawings are as follows:

[0016] Figure 1 A schematic diagram of an embodiment of a circularly polarized Yagi antenna related to the present application;

[0017] Figure 2 A partial schematic diagram of an embodiment of a circularly polarized Yagi antenna related to the present application;

[0018] Figure 3 A sectional view of an electrical bridge box in an embodiment of a circularly polarized Yagi antenna related to the present application;

[0019] Figure 4 A schematic diagram of a coaxial line layout in an embodiment of a circularly polarized Yagi antenna related to the present application;

[0020] Figure 5 A connection schematic diagram of a combining power divider in an embodiment of a circularly polarized Yagi antenna related to the present application;

[0021] Figure 6 A link performance loss simulation diagram of an embodiment of a circularly polarized Yagi antenna related to the present application;

[0022] Figure 7 An antenna gain simulation diagram of an embodiment of a circularly polarized Yagi antenna related to the present application;

[0023] Figure 8 An antenna axial ratio simulation diagram of an embodiment of a circularly polarized Yagi antenna related to the present application;

[0024] Figure 9 An antenna direction simulation diagram of an embodiment of a circularly polarized Yagi antenna related to the present application.

[0025] Explanation of reference signs: 100 - antenna main pole; 110 - director element; 120 - feed element; 121 - Z-shaped metal part; 122 - strip-shaped metal part; 123 - clamp; 130 - reflector element; 200 - bridge box; 210 - bridge main plate; 220 - bridge chip; 230 - 0-degree pin; 240 - 90-degree pin; 250 - insulating partition; 300 - coaxial line; 310 - line core; 320 - transmission line sheath; 400 - combining power divider; 410 - signal output port; 420 - signal input port; 500 - antenna balsa connecting rod; 600 - turntable; 700 - support rod. DETAILED DESCRIPTION

[0026] Hereinafter, a detailed description will be given of the specific embodiments of the present application with reference to the accompanying drawings.

[0027] As shown in Figure 1 , the present application provides a circularly polarized Yagi antenna, which is a 320 MHz frequency band double-element eight-element circularly polarized orthogonal Yagi antenna composed of symmetrical first antenna elements and second antenna elements, and uses a feed bridge for feeding. The feed bridge is composed of a combining power divider 400, a transmission line, and a bridge box 200. The first antenna elements and the second antenna elements are connected by an antenna balsa connecting rod 500. A support rod 700 is provided below the antenna balsa connecting rod 500, and the support rod 700 is used to support the antenna balsa connecting rod 500.

[0028] As shown in Figure 1 , the first antenna elements and the second antenna elements are the same in structure, and the first antenna elements will be taken as an example for description. The first antenna elements include a plurality of element groups connected by an antenna main pole 100 perpendicular to the horizontal plane. The antenna main pole 100 is connected to the antenna balsa connecting rod 500. The plurality of element groups include, from top to bottom, at least one director element group, at least one feed element group, and at least one reflector element group. The bridge box 200 is installed on the antenna main pole 100 near the feed element group, and at least one feed element 120 is connected to the bridge box 200. The positive electrode of the feed element 120 is insulated from the antenna main pole 100, and the negative electrode of the feed element 120 is connected to the antenna main pole 100.

[0029]

[0030] Table 1 (unit: millimeter. L1-L8 are arranged from bottom to top)

[0031] Now commonly.

[0032] In this embodiment, as Figure 1As shown, the director vibrator group, the feed vibrator group and the reflector vibrator group respectively include four vibrators, which are arranged in a cross shape (orthogonal) and are vertically arranged with the antenna main rod 100. The director vibrator group is six, which are arranged on the antenna main rod 100 from top to bottom at the top end of the antenna main rod 100. The feed vibrator group is one, which is arranged below the director vibrator group at the lowermost position. The reflector vibrator group is one, which is arranged below the feed vibrator group. The spacing between each group of vibrators and the length of the vibrators are shown in Table 1.

[0033] In this embodiment, the negative electrode of the feed vibrator 120 is connected to the antenna main rod 100 through a metal fixing piece, realizing the common ground design of the negative electrode of the feed vibrator 120 and the electric bridge. The other reflector vibrators 130 and director vibrators 110 are connected to the antenna main rod 100 through metal fixing pieces, and only the positive electrode of the feed vibrator 120 is fixed to the antenna main rod 100 through a plastic fixing piece and is insulated and isolated.

[0034] In this embodiment, each group of vibrators is made of a circular aluminum pipe with a diameter of 8 mm. In addition, in other embodiments, vibrators made of other sizes and / or materials can also be used according to actual needs.

[0035] As shown in the figure, Figure 5 The combining power divider 400 is arranged above the antenna wood connecting rod 500. The combining power divider 400 includes two signal input ports 420 and one signal output port 410. The two signal input ports 420 are respectively connected to the electric bridge box 200 on the two antenna units through transmission lines. The signal output port is electrically connected to the high-speed terminal communication module of the ground station through a transmission line. The combining power divider 400 can equally divide the power of the two antenna units, so that they are fed in phase and electrically connected to the high-speed terminal communication module of the ground station, thereby playing a symmetrical balancing role on the two antenna units.

[0036] As shown in the figure, Figure 3 The electric bridge box 200 includes an electric bridge main board 210, the electric bridge main board 210 is provided with an electric bridge chip 220, and the electric bridge chip 220 is electrically connected with the electric bridge main board 210. The electric bridge main board 210 further includes a main board ground, an input pin and an output pin. The main board ground is used to provide a grounding pin for the electric bridge main board 210. The input pin is connected with the feed vibrator 120 through a connecting device. The output pin is electrically connected with the combining power divider 400 through a transmission line.

[0037] In this embodiment, the antenna main rod 100 is a square metal tube. The metal tube is a hollow structure, and its outer diameter is 25x25 mm. As shown in the figure, Figure 4As shown, the transmission line can pass through the metal square tube, thereby connecting the combiner / divider 400 and the bridge main board 210, while eliminating the influence of the transmission line surface current on the antenna. Additionally, in other embodiments, the antenna main rod 100 can be made of other sizes, shapes, and / or materials as needed.

[0038] In this embodiment, the bridge chip 220 is a 320MHz chip, specifically model HC0350A03. The bridge chip 220 is soldered and fixed to the bridge motherboard 210 using SMT (Surface Mount Technology). Alternatively, in other embodiments, the bridge chip 220 may be used with different models and / or different connection technologies depending on actual needs.

[0039] In this embodiment, the transmission line is a coaxial cable 300, which includes a core 310 and a transmission line sheath 320. The core 310 and the transmission line sheath 320 are insulated from each other. The core 310 is electrically connected to the output pin, and the transmission line sheath 320 is connected to the motherboard ground.

[0040] Among them, such as Figure 2 As shown, the input pins include a 0-degree pin 230 and a 90-degree pin 240, which are electrically connected to the positive circuits of the two feed vibrators 120, respectively. In this embodiment, there are two connection devices: a Z-shaped metal component 121 and a strip-shaped metal component 122. One end of the Z-shaped metal component 121 and the strip-shaped metal component 122 are connected to the two feed vibrators 120 via clamps 123, respectively. The other end of the Z-shaped metal component 121 extends into the bridge box 200 and connects to the 90-degree pin 240; simultaneously, the other end of the strip-shaped metal component 122 extends into the bridge box 200 and connects to the 0-degree pin 230. An insulating partition 250 is provided between the Z-shaped metal component 121 and the strip-shaped metal component 122 and the bridge box 200. The insulating partition 250 can be made of insulating materials such as rubber rings. Alternatively, in other embodiments, the other end of the Z-shaped metal component 121 may be configured to extend into the bridge box 200 and connect to the 0-degree pin 230; at the same time, the other end of the strip-shaped metal component 122 may extend into the bridge box 200 and connect to the 90-degree pin 240.

[0041] Among them, such as Figure 1 As shown, a turntable 600 is provided at the top of the support rod 700, and the antenna bakelite connecting rod 500 is fixedly mounted on the turntable 600, so that the two antenna units can rotate with the turntable 600.

[0042] In this embodiment, the distance between the first antenna element and the second antenna element is 1.2 meters, and they are connected by a middle bakelite connecting rod.

[0043] It is worth mentioning that the circularly polarized Yagi antenna involved in the embodiments of the present application is simulated and evaluated by establishing a model through a three-dimensional electromagnetic simulation software, as shown in the following table. Figures 6-9 As shown in the table, the antenna gain is greater than 15dBi, the antenna axial ratio is less than 3dB, and the antenna works at 320MHz with high gain and high directivity left-handed circular polarization characteristics. Compared with other high gain antenna schemes, the circularly polarized Yagi antenna involved in the embodiments of the present application has smaller wind resistance in the use of external environment, and at the same time, compared with the feed position design of the Yagi antenna in the prior art, the performance is better, which is convenient for practical application, and each performance meets the target design requirements.

[0044] The term "comprising" used in the full text of the present application should not be interpreted as limited to the following; it does not exclude other structural elements or steps.

[0045] It can be understood that those skilled in the art can combine the features mentioned in one or more embodiments mentioned in the full text of the present application with the features in other embodiments in any appropriate manner to implement the present application.

[0046] Note that the above is only the preferred embodiment of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the technical concept of the present application, which all belong to the protection scope of the present application.

Claims

1. A circularly polarized Yagi antenna, characterized by, The antenna includes a first antenna array element and a second antenna array element, the first antenna array element and the second antenna array element are connected through an antenna electric wood connecting rod, a supporting rod is arranged below the antenna electric wood connecting rod, the supporting rod is used for supporting the antenna electric wood connecting rod, a combining power divider is arranged on the antenna electric wood connecting rod, signal input ports of the combining power divider are connected with the first antenna array element and the second antenna array element through transmission lines respectively, and The first antenna array element and the second antenna array element respectively include a plurality of groups of dipoles, the plurality of groups of dipoles are connected through an antenna main rod perpendicular to a horizontal plane, and the plurality of groups of dipoles include at least one group of director dipoles, at least one group of feed dipoles and at least one group of reflector dipoles from top to bottom. The first antenna array element and the second antenna array element respectively include a bridge box, the bridge box is arranged on the antenna main rod close to the group of feed dipoles, and at least one feed dipole in the group of feed dipoles is connected with the bridge box. The positive pole of the feed dipole is insulated from the antenna main rod, and the negative pole of the feed dipole is connected with the antenna main rod to realize common ground.

2. The circularly polarized Yagi antenna according to claim 1, characterized by The bridge box includes a bridge main board, the bridge main board is provided with a bridge chip, the bridge chip is electrically connected with the bridge main board, and the bridge main board includes: A main board ground for providing a grounding pin for the bridge main board; An input pin connected with the feed dipole through a connecting device; An output pin electrically connected with the signal input port through the transmission line.

3. The circularly polarized Yagi antenna according to claim 2, characterized in that The transmission line is a coaxial line, the coaxial line includes a wire core and a transmission line outer skin, the wire core and the transmission line outer skin are insulated from each other, the wire core is electrically connected with the output pin, and the transmission line outer skin is connected with the main board ground.

4. The circularly polarized Yagi antenna according to claim 2, characterized by The input pin includes a 0-degree pin and a 90-degree pin, and the 0-degree pin and the 90-degree pin are respectively electrically connected with the positive poles of two feed dipoles.

5. The circularly polarized Yagi antenna according to claim 3, wherein The antenna main rod is a metal square tube, the metal square tube is a hollow structure, and the coaxial line passes through the metal square tube.

6. The circularly polarized Yagi antenna according to claim 4, wherein The connecting device is a Z-shaped metal part or a strip-shaped metal part, One end of the Z-shaped metal part is electrically connected with the feed dipole through a hoop, the other end of the Z-shaped metal part extends into the bridge box and is electrically connected with the 0-degree pin or the 90-degree pin; One end of the strip-shaped metal part is electrically connected with the feed dipole through a hoop, and the other end of the strip-shaped connecting part extends into the bridge box and is electrically connected with the 0-degree pin or the 90-degree pin.

7. The circularly polarized Yagi antenna according to claim 6, wherein Insulation is provided between the Z-shaped metal part and the strip-shaped metal part and the bridge box.

8. The circularly polarized Yagi antenna according to claim 5, wherein The plurality of groups of dipoles are made of aluminum pipes, and the length and the spacing of each group of dipoles are specific values.

9. The circularly polarized Yagi antenna according to claim 1, wherein, The combining power divider includes a signal output port, and the signal output port is electrically connected with a high-speed terminal communication module of a ground station.

10. The circularly polarized Yagi antenna according to claim 1, wherein, A turntable is arranged at the top end of the supporting rod, and the antenna electric wood connecting rod is fixedly arranged on the turntable.

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