Dual-circular-polarization wide-angular-domain coverage antenna servo system

Abstract

The utility model provides a dual circularly polarized wide angular domain coverage antenna servo system, which comprises three co-frequency combiners, each co-frequency combiner divides an input signal into two signals with a 90-degree phase difference, and is characterized in that the first co-frequency combiner is connected to a first array antenna, and the second co-frequency combiner is connected to a second array antenna; the first common-frequency combiner is connected to a first array antenna, the second common-frequency combiner is connected to a second array antenna, the third common-frequency combiner is connected to a third array antenna, and three output ports of the first power divider are respectively connected to first input ports of the three common-frequency combiners; and three output ports of the second power divider are respectively connected to second input ports of the three same-frequency combiners.

Description

Technical Field

[0001] The present invention relates to the field of communications, and more particularly to an antenna servo system. Background Art

[0002] Satellite communication systems usually require circularly polarized antennas. In addition, the uplink and downlink in satellite communication systems operate at different frequencies, and the uplink and downlink have different polarization requirements for antennas. For example, ground terminal antennas have characteristics such as wideband and dual circular polarization. Summary of the invention

[0003] The present application provides a dual circularly polarized wide-angle coverage antenna servo system, comprising: three co-frequency combiners, each co-frequency combiner divides an input signal into two signals with a 90-degree phase difference from each other, characterized in that the first co-frequency combiner is connected to the first array antenna, the second co-frequency combiner is connected to the second array antenna, and the third co-frequency combiner is connected to the third array antenna, and the three output ports of the first power divider are respectively connected to the first input ports of the three co-frequency combiners, and the three output ports of the second power divider are respectively connected to the second input ports of the three co-frequency combiners, and the signal passes through the first power divider, the three co-frequency combiners and the three array antennas to form a left-hand circularly polarized signal, and the signal passes through the second power divider, Three same-frequency combiners and three array antennas form right-hand circularly polarized signals, thereby realizing dual circularly polarized signal transmission; the surfaces of the first array antenna, the second array antenna, and the third array antenna are rectangular, and one side of the surface of the first array antenna is connected to one side of the surface of the second array antenna, and the angle formed between the surface of the first array antenna and the surface of the second array antenna is 45 degrees, one side of the surface of the first array antenna is connected to one side of the surface of the third array antenna, and the angle formed between the surface of the first array antenna and the surface of the third array antenna is 45 degrees, and the second array antenna and the third array antenna are connected to a single-axis servo unit through a fixing device, and the single-axis servo unit rotates continuously in the range of 0 to 360 degrees along a direction parallel to the surface of the first array antenna.

[0004] The above system can realize a wide-angle coverage antenna servo system. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the invention of the present application, any of the currently described embodiments or preferred methods.

[0006] Figure 1 is a schematic diagram of the antenna servo system.

[0007] Figure 2is the block diagram of the antenna servo system.

[0008] Figure 3 It is a schematic diagram of an array antenna in an antenna system.

[0009] Figure 4 is the normalized azimuth pattern of the antenna.

[0010] Figure 5 is the normalized elevation pattern of the antenna.

[0011] Figure 6 is the axial ratio pattern of the antenna in azimuth plane.

[0012] Figure 7 is the axial ratio pattern of the antenna in the elevation plane. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0014] Figure 1 FIG. 1 shows a schematic diagram of an antenna servo system. Figure 1 As shown, a broadband dual circular polarization wide angle coverage antenna servo system includes an antenna part, a metal fixing frame and a single-axis servo unit. The antenna is located at the top and fixed on the metal fixing frame; the metal fixing frame is located between the antenna part and the single-axis servo unit and fixed on the servo unit through a connecting device. The single-axis servo unit can rotate clockwise or counterclockwise along the horizontal direction and can rotate continuously within the range of 0° to 360°.

[0015] Figure 2 It is a block diagram of a part of the antenna servo system. The circuit in the antenna servo system can be arranged under the array antenna. The antenna servo system can include a 90° bridge, a power divider and a feed port. The 90° bridge can be a co-frequency combiner, which can continuously sample the transmission power along a certain direction of the transmission line and divide an input signal into two signals with equal amplitude and 90° phase difference from each other. The power divider can divide one input signal into multiple outputs, or combine multiple signals into one output.

[0016] In one embodiment, the normal direction of the first antenna array forms an angle of 45° with the normal direction of the second antenna array, and the normal direction of the first antenna array forms an angle of 45° with the normal direction of the third antenna array.

[0017] The first array antenna is connected to the first 90° bridge output port, the second array antenna is connected to the second 90° bridge output port, and the third array antenna is connected to the third 90° bridge output port. The first input ports of the first 90° bridge, the second 90° bridge, and the third 90° bridge are connected to the first power divider; the second input ports of the first 90° bridge, the second 90° bridge, and the third 90° bridge are connected to the second power divider.

[0018] In one embodiment, dual circular polarization can be achieved in the following manner. For example, the signal input from the input port of the first power divider is fed into one input port of the first 90° bridge, the second 90° bridge, and the third 90° bridge respectively after passing through the three output ports, and the signal output from the output ports of the first 90° bridge, the second 90° bridge, and the third 90° bridge is fed into two input ports of the first array antenna, the second array antenna, and the third array antenna respectively, and after being radiated by the antenna, a left-hand circularly polarized wave is formed by spatial coherent superposition. At the same time, the signal input from the input port of the second power divider is fed into another input port of the first 90° bridge, the second 90° bridge, and the third 90° bridge respectively after passing through the three output ports, and the signal output from the output ports of the first 90° bridge, the second 90° bridge, and the third 90° bridge is fed into two input ports of the first array antenna, the second array antenna, and the third array antenna respectively, and after being radiated by the antenna, a right-hand circularly polarized wave is formed by spatial coherent superposition.

[0019] Figure 3 It is a schematic diagram of an array antenna in an antenna system. The array antenna consists of an upper PCB board, a lower PCB board, and a supporting dielectric column in the middle. The upper PCB board is provided with multiple square radiating metal patches along a certain direction, and the lower PCB board is provided with multiple square slotted radiating metal patches and parallel-fed microstrip lines along the same direction. The parallel-fed microstrip line refers to a microstrip line that connects multiple radiating metal patches together in parallel. The end of the parallel-fed microstrip line is directly connected to the square slotted radiating metal patch. The upper PCB board and the lower PCB board are connected through the dielectric supporting column in the middle.

[0020] The following is an introduction to the wideband implementation method. The PCB board above the array antenna is printed with a square radiating metal patch as a parasitic patch. The parasitic patch can be located on the upper PCB, and is fed through the feeding patch through spatial electromagnetic coupling and radiates electromagnetic waves to the outside. The PCB board below is provided with a square slotted radiating metal patch as a feeding patch. It is located on the same layer as the parallel-fed microstrip line, and is directly fed by the parallel-fed microstrip line and radiates electromagnetic waves to the outside. The two patches can form two resonant circuits with two resonant frequencies; slotting the radiating metal patch of the PCB board below can form a new resonant frequency, thereby widening the bandwidth of the antenna. In one embodiment, the relative bandwidth of the antenna can be greater than 20%; the relative bandwidth of the 90° bridge and the power divider can be greater than 50%. The ratio of the absolute bandwidth to the center frequency is the relative bandwidth, where Δf is the maximum frequency difference from the center frequency f0, and 2Δf represents the absolute bandwidth.

[0021] The following describes how to achieve wide-angle coverage in the antenna servo system. The first array antenna normal is installed at a 45° angle to the second array antenna normal, and the first array antenna normal is installed at a 45° angle to the third array antenna normal; this allows the antenna to exhibit wide beam characteristics in the XOZ plane. The single-axis servo continuously rotates clockwise or counterclockwise within the range of 0° to 360° in the XOY plane, achieving wide-angle coverage of the antenna in the upper half of the airspace.

[0022] In one embodiment, a dual circular polarization wide angle coverage antenna servo system is provided, comprising: three same-frequency combiners, each of which divides an input signal into two signals with a 90-degree phase difference from each other, characterized in that the first same-frequency combiner is connected to the first array antenna, the second same-frequency combiner is connected to the second array antenna, and the third same-frequency combiner is connected to the third array antenna, and the three output ports of the first power divider are respectively connected to the first input ports of the three same-frequency combiners, the three output ports of the second power divider are respectively connected to the second input ports of the three same-frequency combiners, and the signal passes through the first power divider, the three same-frequency combiners and the three array antennas to form a left-hand circularly polarized signal, and the signal passes through the second power divider The first array antenna, the second array antenna and the third array antenna have rectangular surfaces, and one side of the surface of the first array antenna is connected to one side of the surface of the second array antenna, and the angle formed between the surface of the first array antenna and the surface of the second array antenna is 45 degrees. The first array antenna is connected to one side of the surface of the third array antenna, and the angle formed between the surface of the first array antenna and the surface of the third array antenna is 45 degrees. The second array antenna and the third array antenna are connected to a single-axis servo unit through a fixing device, and the single-axis servo unit rotates continuously in a range of 0 to 360 degrees along a direction parallel to the surface of the first array antenna.

[0023] In another embodiment, each array antenna includes two PCB boards and a dielectric column located between the two PCB boards, and the first PCB board is provided with a plurality of square radiating metal patches along a certain direction, and the second PCB board is provided with a plurality of square radiating metal patches along the same direction, and the plurality of square radiating metal patches are connected by parallel-fed microstrip lines, and the plurality of square radiating metal patches form two resonant frequencies, thereby widening the ratio of the absolute bandwidth frequency to the center frequency of the antenna servo system.

[0024] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0025] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A dual circular polarization wide angle coverage antenna servo system, comprising: Three same-frequency combiners, each of which divides an input signal into two signals with a phase difference of 90 degrees from each other, characterized in that the first same-frequency combiner is connected to the first array antenna, the second same-frequency combiner is connected to the second array antenna, and the third same-frequency combiner is connected to the third array antenna, and the three output ports of the first power divider are respectively connected to the first input ports of the three same-frequency combiners, and the three output ports of the second power divider are respectively connected to the second input ports of the three same-frequency combiners, and the signal passes through the first power divider, the three same-frequency combiners and the three array antennas to form a left-handed circularly polarized signal, and the signal passes through the second power divider, the three same-frequency combiners and the three array antennas to form a right-handed circularly polarized signal, thereby realizing dual circularly polarized signal transmission; The surfaces of the first array antenna, the second array antenna, and the third array antenna are rectangular, and one side of the surface of the first array antenna is connected to one side of the surface of the second array antenna, and the angle formed between the surface of the first array antenna and the surface of the second array antenna is 45 degrees. One side of the surface of the first array antenna is connected to one side of the surface of the third array antenna, and the angle formed between the surface of the first array antenna and the surface of the third array antenna is 45 degrees. In addition, the second array antenna and the third array antenna are connected to a single-axis servo unit through a fixing device, and the single-axis servo unit rotates continuously in a range of 0 to 360 degrees along a direction parallel to the surface of the first array antenna.

2. The dual circular polarization wide angle coverage antenna servo system according to claim 1, wherein: Each array antenna includes two PCB boards and a dielectric column located between the two PCB boards, and the first PCB board is provided with a plurality of square radiating metal patches along a certain direction, and the second PCB board is provided with a plurality of square radiating metal patches along the same direction, and the plurality of square radiating metal patches are connected by parallel-fed microstrip lines, and the plurality of square radiating metal patches form two resonant frequencies, thereby widening the ratio of the absolute bandwidth frequency to the center frequency of the antenna servo system.

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