Feedforward radar antenna

Abstract

The invention relates to a feedforward radar antenna. The antenna comprises a feed source and a metamaterial panel. The antenna also comprises a reflecting plate clinging to one side of the metamaterial panel, wherein the metamaterial panel comprises a plurality of core layers with the same refractive index distribution; each core layer 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 feedforward radar antenna has the following beneficial effects: by designing the distribution law of the refractive indexes inside the metamaterial panel, the deflection of large-angle incidence of electromagnetic waves is improved, and the energy radiation efficiency is improved; meanwhile, the front-to-back ratio of the antenna is increased, and the directivity of the antenna becomes better; and as the antenna adopts the flat metamaterial, the space of the antenna is saved.

Description

technical field [0001] The invention relates to the field of radar antennas, and more specifically, to a feedforward radar antenna using metamaterials. Background technique [0002] Such as figure 1 As shown, the feedforward parabolic antenna includes a feed source 1, a main reflector 2 and a bracket 3, the feed 1 is installed at the focal point of the main reflector 2, and the mouth surface of the feed source 1 and the mouth surface of the main reflector 2 On the contrary, the electromagnetic waves reflected by the main reflecting surface 2 are concentrated into the feed source. The advantage of the feedforward parabolic antenna is that the feed source has little shielding of electromagnetic waves in the air, the structure is simple, the cost is low, and the installation and debugging are easy. The tuner is located at the focal point of the parabola, and sunlight is sometimes focused on the tuner, which increases the temperature of the tuner, reduces the signal-to-noise r...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of manufacturing parabolic reflectors in the prior art, and provide a feed-forward radar antenna. The antenna adopts a flat metamaterial, which saves the space of the antenna, improves the deflection problem of electromagnetic wave incident at a large angle, and improves the The efficiency of energy radiation; at the same time, it also improves the front-to-back ratio of the antenna, making the antenna's directivity better, and also solves the difficulty of avoiding the manufacture of high-precision parabolic reflectors

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