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Device for attenuating creeping wave on antenna surface

A creeping wave and antenna technology, which is applied in the field of devices for attenuating creeping waves on the surface of an antenna, can solve problems such as affecting antenna performance, difficult to identify electromagnetic waves, and affecting radar scanning accuracy, so as to improve the front-to-back ratio, reduce the impact, and ensure high efficiency. Effect

Active Publication Date: 2015-03-11
KUANG CHI INST OF ADVANCED TECH +1
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Problems solved by technology

[0003] In existing antennas, creeping waves will be generated on the surface of the antenna when electromagnetic waves are emitted, and the existence of creeping waves will affect the performance of the antenna. For example, in radar antennas, creeping waves will be generated at the same time when the radar antenna emits electromagnetic waves. In this way, it is difficult for us to identify whether the received electromagnetic wave is the radar wave reflected from the required reconnaissance object or the crawling wave, which has a great impact on the accuracy of radar scanning

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  • Device for attenuating creeping wave on antenna surface
  • Device for attenuating creeping wave on antenna surface
  • Device for attenuating creeping wave on antenna surface

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Embodiment Construction

[0020] The present invention will be further described below with reference to the drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0021] Metamaterials are a new type of material with artificial microstructures as basic units and spatially arranged in a specific manner, with special electromagnetic response. It includes artificial microstructures and substrates to which the artificial microstructures are attached. Artificial microstructures are planar or three-dimensional structures composed of at least one metal wire responsive to electromagnetic waves. Multiple artificial microstructures are periodically arranged on a substrate. Each artificial microstructure and the substrate to which it is attached occupies Part is a metamaterial unit. The substrate can be any material different from the man-made microstructure. The superposition of these two materials makes each metamaterial unit produce an equivalent dielectric cons...

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Abstract

The invention relates to a device for attenuating creeping wave on antenna surface. The device comprises an antenna and a metamaterial film layer, wherein the antenna comprises a waveguide tube and a bell mouth; the metamaterial film layer consists of a plurality of metamaterial gradient layers, and is distributed on the surface of the waveguide tube of the antenna; and each metamaterial gradient layer comprises a platy substrate and a plurality of artificial microstructures arranged on the substrate. By the device, the metamaterial film layer is arranged on the surface of the antenna, and the creeping wave which occurs on the surface of the antenna is attenuated by changing refractive index of the metamaterial film layer, so that the influence of the creeping wave on the antenna can be greatly reduced to ensure that front-to-rear ratio of the antenna is obviously improved; and therefore, the high efficiency of the antenna is guaranteed.

Description

Technical field [0001] The invention relates to the field of antennas, and more specifically, to a device for attenuating creeping waves on the surface of an antenna. Background technique [0002] The diffraction phenomenon of electromagnetic waves means that electromagnetic waves will go around when they encounter obstacles or gaps smaller than the wavelength. However, electromagnetic waves will continue to propagate on the smooth surface of obstacles or gaps. Such electromagnetic waves are called creeping waves. Creeping waves have two characteristics, that is, if the electromagnetic wave encounters bumps, depressions, edges, discontinuities, gaps, gaps, and junctions of different materials when propagating along the surface, the slope changes, that is, when the surface is discontinuous. There will be a part of the electromagnetic wave returning in the same way. Another characteristic of crawling waves is that if electromagnetic waves encounter the terminal of a slender objec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q13/02H01Q19/00H01Q15/00
Inventor 刘若鹏季春霖岳玉涛宿超
Owner KUANG CHI INST OF ADVANCED TECH
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