Feedback radar antenna

A radar antenna and feed-in technology, applied in the field of back-feed radar antenna, to achieve the effect of far-field power enhancement, increase in front-to-back ratio, and increase the propagation distance

Active Publication Date: 2015-04-22
KUANG CHI INST OF ADVANCED TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Embodiment Construction

[0029] 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.

[0030] 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.

[0031] 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 radar antenna. The antenna comprises a feed source and a metamaterial panel, wherein the feed source is used for radiating electromagnetic waves; the metamaterial panel is used for converting spherical electromagnetic waves to plane electromagnetic waves and comprises a plurality of core layers with the same refractive index distribution; each core layer of the metamaterial panel comprises a plurality of metamaterial units; each metamaterial unit comprises a unit substrate with one or more holes; the refractive indexes of the core layers of the metamaterial panel are circularly distributed, with own centers as the centers of circles; the refractive index gradually decreases with increase of the radius; and the refractive indexes in positions with the same radius are the same. The feedback radar antenna has the following beneficial effects: by changing the distribution conditions of the refractive indexes inside the metamaterial panel, the far-field power of the antenna is greatly enhanced, and the antenna propagation distance is further promoted; and meanwhile, by arranging a wave-absorbing material layer inside the cavity body of the antenna, the front-to-back ratio of the antenna is increased, and the directivity of the antenna becomes better.

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 Patents(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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