Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC

A composite material and bow-tie-shaped technology, which is applied in the field of stealth, can solve the problems of reducing practical value, narrow operating frequency band of absorbing materials, and inability to support broadband, etc., and achieve the effect of small thickness, excellent broadband performance, and low processing and manufacturing difficulty

Inactive Publication Date: 2015-08-19
BEIHANG UNIV
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  • Application Information

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Problems solved by technology

[0006] However, the operating frequency band of this absorbing material is narrow, and the defect that it cannot support broadband work greatly reduces its practical value.

Method used

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  • Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC
  • Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC
  • Broadband reduction RCS composite material based on crossed bow-tie-shaped AMC

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] Compared with other patch antennas, the bowtie antenna has good broadband characteristics, and the characteristic impedance can be maintained in a wider frequency band, so the cross bowtie patch has broadband characteristics as an AMC unit, and at the same time, two reflected waves with opposite phases will occur The phenomenon of interference and destructiveness reduces the backward energy, and the closer the phase difference is to 180°, the lower the backward energy. According to the array antenna theory, there is a corresponding relationship between the phase difference frequency bands of the two AMC arrays and the RCS reduction frequency band of this composite material. Taking the metal plate of the same size as the comparison object, if -10dB is selected as the reduction target, the two AMC arrays The reflection phase difference range is 180°±37°....

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Abstract

The invention provides a broadband reduction RCS composite material based on crossed bow-tie-shaped AMC (artificial magnetic conductors). The material is characterized in that the composite material is in a three-layer structure, and comprises an AMC patch array, a medium substrate, and a metal floor in sequence from top to bottom, wherein the AMC patch array is arrays respectively formed by two kinds of crossed bow-tie-shaped AMC patches. The shapes of the two kinds of crossed bow-tie-shaped AMC patches are that the center is square, four edges of the square are respectively connected with four trapezoids, the short bottom edges of the trapezoids are connected with the square, the long bottom edges of the four trapezoids are connected with rectangles in sequence, and each patch is a whole integrated structure. The composite material is good in broadband performance. Compared with a metal sheet in the same size, the composite material has RCS reduction of more than -10 dB in the frequency range of 16.2-27.2 GHz, covering the whole K-band. The composite material is small in thickness, and can be conformal easily. The composite material is suitable to manufacture ultralight and ultrathin wave absorbers or radar absorbing materials. The composite material is simple in structure and materials, and is low in processing and manufacturing difficulty.

Description

technical field [0001] This application relates to the field of stealth technology, in particular to a composite material. Background technique [0002] Stealth technology is an important means in the modern military to hide oneself from the enemy's discovery, so as to enhance the assault capability or protect itself. The stealth performance of weapons or flying objects is mainly determined by the size of their radar cross section (Radar Cross Section, referred to as RCS). Only by reducing the RCS value of the target can it be more difficult for the enemy to detect. Common ways to reduce RCS are shape design and radar absorbing materials. The shape design is to make the energy reflection deviate from the incoming wave direction by rationally designing the target shape, that is, to move the large forward echo to the side. However, the shape design is limited by the structure, size, etc., and there are certain bottlenecks. Radar Absorbing Material (Radar Absorbing Material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00
Inventor 马剑南洪韬陈益龙
Owner BEIHANG UNIV
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