Feedback type radar antenna

A radar antenna and feed-in technology, which is applied in the field of back-feed radar antennas, achieves the effects of increasing the propagation distance, increasing the front-to-back ratio, and enhancing the far-field power.

Active Publication Date: 2012-05-30
KUANG CHI INST OF ADVANCED TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the difficulty of making parabolic reflector and hyperboloid secondary reflector in the prior art, and to provide a kind of feed-back radar antenna. Space; and improve the deflection problem of large-angle electromagnetic wave incident, improve the efficiency of antenna energy radiation

Method used

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0031] figure 2 It is a schematic diagram of the structure of the feed-back radar antenna of the present invention. The antenna includes a feed source 10, a metamaterial panel 20, a housing 30, and a wave-absorbing material layer 40. The feed source 10 is fixed on the housing 30, and the wave-absorbing material layer 40 is tight. Attached to the inner wall of the housing 30, the absorbing material layer 40 is connected to the metamaterial panel 20, and the absorbing material layer 40 and the metamaterial panel 20 together form a closed cavity, and the feed source 10 is located in the cavity.

[0032] Usually, the electromagnetic wave radiated from the feed source 10 is a spherical electromagnetic wave, but the far-field direction performance of the spherical electromagn...

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Abstract

The invention relates to a feedback type radar antenna, which comprises a feed source used for radiating electromagnetic waves, and a metamaterial panel used for converting the electromagnetic waves radiated from the feed source from spherical electromagnetic waves into plane electromagnetic waves. The metamaterial panel comprises a plurality of core layers with the same refractive index distribution, and each core layer comprises a plurality of metamaterial units each having a unit basic material and an artificial microstructure, wherein the refractive index of each core layer of the metamaterial panel is circularly distributed around the center of the core layer, the refractive index gradually reduces as radius increases, and the same radius has the same refractive index. The feedback type radar antenna greatly enhances antenna far-field power by changing the refractive index distribution in the metamaterial panel, so as to further increase an antenna transmission distance, and increases a front-to-rear ratio of the antenna by arranging a wave absorbing material layer in the cavity of the antenna to make the antenna more directional.

Description

technical field [0001] The invention relates to the field of radar antennas, more specifically, to a feed-back radar antenna using metamaterials. Background technique [0002] The feed-back antenna is also called the Cassegrain antenna, which consists of a parabolic main reflector 2, a hyperboloid secondary reflector 1, a feed horn 3 and a bracket 4, as shown in figure 1 shown. Since the real focus of the paraboloid main reflector 2 coincides with the virtual focus of the hyperboloid secondary reflector 1, and the phase center of the feed horn 3 coincides with the real focus of the hyperboloid secondary reflector 1, the electromagnetic wave emitted from the satellite passes through the paraboloid main The reflecting surface 2 is reflected once, and then reflected twice by the hyperboloid sub-reflecting surface 1, and then is focused on the phase center of the feed horn 3 and superimposed in the same phase. In this way, the radar antenna can receive or transmit electromagne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q15/02H01Q19/06H01Q17/00
Inventor 刘若鹏季春霖岳玉涛殷俊
Owner KUANG CHI INST OF ADVANCED TECH
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