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Low-sidelobe scanning antenna with double-layer fan-shaped rotating structure and satellite communication system

A technology of rotating structure and scanning antenna, which is applied in the field of satellite communication and can solve the problem of poor antenna sidelobe suppression effect

Active Publication Date: 2021-07-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sidelobe suppression effect of this type of antenna is very poor.

Method used

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  • Low-sidelobe scanning antenna with double-layer fan-shaped rotating structure and satellite communication system
  • Low-sidelobe scanning antenna with double-layer fan-shaped rotating structure and satellite communication system
  • Low-sidelobe scanning antenna with double-layer fan-shaped rotating structure and satellite communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The feed network in this example is composed of two single-layer PCB boards. The signal input port 221 of the feed network is located on the lower PCB board, and the signal is input to the SIW feeder network of the lower PCB board through the coaxial-to-SIW transfer structure. use as image 3 In the design of the BLASS structure shown, the signals in the lower PCB are coupled and output to the upper PCB structure through 16 different cross-slit directional couplers. The coupling section diagram of the two-layer SIW structure is as follows: Figure 4 As shown, the substrate integrated waveguide (SIW) feed network 3 is composed of an upper layer PCB board 31 and a lower layer PCB board 32, the upper layer SIW metal through holes 311 and the lower layer SIW metal through holes 321 are vertically distributed, and form a directional coupler with the coupling slot 33 , the bottom copper layer 312 of the upper PCB board 31 only retains narrow metal strips distr...

Embodiment 2

[0029] Embodiment 2: The feeding network in this embodiment is composed of two layers of metal waveguide structures. like Figure 5 As shown, the feed network 2 is a waveguide feed network 4, which is composed of an upper waveguide structure 41 and a lower waveguide structure 42; the side metal wall 411 of the upper waveguide is vertically distributed with the side metal wall 421 of the lower waveguide, and the coupling slot 43 Constitute a directional coupler; the bottom layer of the upper waveguide is hollowed out, and the top layer 422 of the lower waveguide is not only dug out the coupling gap, but also a groove 423 is dug along the metal wall on the side of the upper waveguide, and the upper waveguide and the lower waveguide pass through the steel ball structure 424 in the groove Close contact.

[0030] The design of the BLASS structure makes the three-layer antenna plate have the characteristics of low side lobe, and the fan-shaped rotating structure of the feed network...

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Abstract

The invention discloses a low-sidelobe scanning antenna with a double-layer fan-shaped rotating structure and a satellite communication system, and the antenna is of a planar antenna structure, and is composed of an antenna body located at the top and a feed network of the double-layer fan-shaped rotating structure at the bottom. The top surface of the antenna body radiates, the back surface of the antenna body is fixed with the upper layer structure of the feed network of the double-layer fan-shaped rotating structure, and the upper layer structure and the lower layer structure of the feed network relatively rotate by taking the fan-shaped circle center as the axis to realize beam scanning. The feed structure comprises a power distribution network, and the low side lobe design of the antenna beam can be realized by controlling the power value distributed to the antenna body. Compared with an existing commercial satellite antenna, the antenna has the advantages of being low in price, low in antenna height, small in size, controllable in wave beam sidelobe level, continuous in wave beam scanning capacity and the like.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a low-sidelobe scanning antenna with a double-layer fan-shaped rotating structure and a satellite communication system. Background technique [0002] Satellite communication has a very important application in modern wireless communication. It has the characteristics of wide coverage, large communication capacity and high transmission quality. In the satellite communication system, the geostationary orbit satellite system has a wider application than the low orbit satellite system due to its higher cost performance. Satellite dishes are used to broadcast communication signals and play a key role in satellite systems. For geostationary orbit satellite systems, satellites need ultra-high target tracking capabilities. During mobile communication, the antenna beam needs to rotate and point to the satellite in real time as the terminal moves. This makes the antenna must have h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q3/02H01Q1/36H01Q1/50H01Q1/28
CPCH01Q3/02H01Q1/36H01Q1/50H01Q1/288Y02D30/70
Inventor 陈鹏胡博余旭涛童心玉
Owner SOUTHEAST UNIV
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