Feed-forward type radar antenna

Abstract

The invention relates to a feed-forward type radar antenna, which comprises a feed source and a metamaterial panel and further comprises a reflection plate tightly adhered to one side of the metamaterial panel. 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 unitcomprises a unit substrate and an artificial micro-structure. The refractive index of each core layer of the metamaterial panel is circularly distributed based on the centre as the circle centre. Therefractive index is gradually reduced as the radius increases. The refractive indexes at the parts with the same radius are the same. According to the feed-forward type radar antenna disclosed by theinvention, the refractive index distribution rule of the metamaterial panel is changed by designing the shape and arrangement of a metal micro-structure in the metamaterial panel; the panel metamaterial is adopted, so the space of the antenna is saved, the deflection problem resulted from large-angle incidence of electromagnetic wave is improved, and the energy radiation efficiency is increased; simultaneously, the front-to-back ratio of the antenna is increased, thus, the antenna has better directivity.

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...

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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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