Offset feed type radar antenna

Abstract

The invention relates to an offset feed type radar antenna, which comprises a feed source, a metamaterial panel and a reflective plate, wherein the feed source is positioned on the other side of the metamaterial panel and in the non-facing region of the metamaterial panel, 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. The offset feed type radar antenna greatly enhances antenna far-field power by changing the refractive index distribution in the metamaterial panel, so as to further improve an antenna transmission distance, and increases the front-to-rear ratio of the antenna to make the antenna more directional; furthermore, the invention uses the offset feed type radar antenna to prevent the feed source blocking the radiation of electromagnetic waves and the radiated electromagnetic waves affecting the feed source.

Description

technical field [0001] The invention relates to the field of radar antennas, in particular to a bias-feed radar antenna using metamaterials. Background technique [0002] The radar antenna converts the spherical wave radiated by the feed source into a plane wave through the reflector, so as to realize directional reception or emission of electromagnetic waves. The reflector currently used is in the shape of a parabola, and the feed source is located near the focus of the reflector. [0003] The working principle of the radar antenna is similar to that of an optical mirror. The existing radar parabolic antenna is as figure 1 As shown, it includes a collapsible source 1, a parabolic reflector 2 and a bracket 3. A feed 1 for transmitting or receiving electromagnetic waves is placed at the focus of the parabolic reflector 2. Using the focusing characteristics of the parabolic reflector 2, the The spherical wave is reflected by the parabolic reflector 2 and converted into a plan...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of complex production process of manufacturing parabolic antenna in the prior art, and provide a kind of offset radar antenna, which proposes a radar antenna with a simple structure and a flat reflector. The antenna has the advantage that the parabolic antenna can receive or transmit electromagnetic waves in a directional manner, and at the same time avoids the complicated process of producing the parabolic antenna

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