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UHF-band radar absorber

A radar absorption and frequency band technology, applied in the field of stealth, can solve the problems of large material thickness, narrow absorption bandwidth, and failure to meet performance requirements, and achieve the effect of low reflectivity and broadband absorption

Active Publication Date: 2018-09-04
BEIJING INST OF ENVIRONMENTAL FEATURES
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AI Technical Summary

Problems solved by technology

[0004] Structural radar absorbing materials are one of the low-frequency stealth technology methods, but there are still many problems: (1) Under the constraint of limited thickness, the absorbing bandwidth is very narrow, which cannot meet the performance requirements; (2) In order to achieve the low-frequency broadband absorption effect , the thickness of the material is very large, which cannot be tolerated by general aircraft

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] figure 1 It is a schematic diagram of the main components of the UHF band radar absorber of the embodiment of the present invention. Such as figure 1 As shown, the UHF frequency band radar absorber includes: a skin layer 1 , an active frequency selective surface 2 , a spacer layer 3 and a metal back plate 4 arranged in sequence. In ...

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Abstract

The invention relates to an UHF-band radar absorber, belongs to the technical field of stealth. The UHF-band radar absorber comprises a sheath layer, an active frequency selection surface, a spacing layer and a metal backboard arranged successively; the active frequency selection surface comprises a frequency selection surface and a resistor and a varactor connected to the frequency selection surface; and when electromagnetic waves irradiates the frequency selection surface, electromagnetic waves whose frequency is within the passband width passes the surface, and electromagnetic waves whose frequency is beyond the passband width are reflected. The UHF-band radar absorber can handle the contradiction between the material thickness and wave absorbing bandwidth, the resonant frequency of theUHF-band radar absorber can be adjusted continuously within a wide frequency band, and relatively larger equivalent bandwidth can be realized by tuning the wave absorbing frequency on the premise oflimited thickness.

Description

technical field [0001] The invention relates to the field of stealth technology, in particular to a UHF frequency band radar absorber. Background technique [0002] At present, with the development of low-frequency anti-stealth technology, more and more Ultra-high Frequency (UHF) radars have come out one after another. Effectively reducing the Radar Cross-section (RCS) in the UHF frequency band has always been a bottleneck in the design of aircraft stealth penetration. The basic methods to achieve target RCS reduction mainly include shaping technology, radar absorbing material technology and active cancellation technology. [0003] In the UHF band, because the size of the aircraft is similar to the wavelength of the radar, it is difficult to achieve the stealth effect through the shape design, and it is restricted by the aerodynamic performance of the target; due to the limitations of weight and mechanical strength, the radar absorbing material coated on the surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/002H01Q15/0093H01Q17/007
Inventor 戚开南万昊汪勇峰肖志河
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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