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Random surface with accurately designed bandwidth

A random surface and bandwidth technology, applied in the field of random surfaces, can solve the problems of consuming huge computer resources and computing time, achieve high engineering application value, reduce design workload, and simple unit structure

Active Publication Date: 2016-11-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional design is based on the point frequency design, and the bandwidth of the random surface needs to be learned through large-scale electromagnetic simulation, which consumes huge computer resources and computing time

Method used

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  • Random surface with accurately designed bandwidth
  • Random surface with accurately designed bandwidth

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] The random surface with precisely designed bandwidth proposed by the present invention is composed of three basic sub-arrays with the same size, and different sub-arrays are composed of different periodic arrangements of basic units, which is similar to the planar reflective array structure.

[0027] The present invention adopts three basic units altogether, and the unit structure is as follows: figure 1 As shown, it consists of a dielectric substrate 2, a metal patch 1 on the upper surface of the dielectric substrate, and a metal back plate 3 shown in the table below. The metal back plate 3 can prevent the transmission of electromagnetic waves. figure 1 (a) is the front view of the basic unit 1, which is a square ring unit; figure 1 (b) is the front view of the basic unit 2, which is a square ring unit; figure 1 (c) is the front view...

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Abstract

The invention discloses a random surface with an accurately designed bandwidth. The random surface is formed by arranging three fundamental submatrixes, wherein the submatrixes are the same in size and are basically the same in number; and different submatrixes are formed by periodically arranging the same fundamental units, so that three kinds of fundamental units are arranged in all. Each fundamental unit comprises a dielectric substrate, a metal patch and a metal backboard, wherein each metal patch and each metal backboard cover the upper surface and the lower surface of the corresponding dielectric substrate respectively. The fundamental units have low loss characteristics; and the phase relationship meets the condition that the phase difference between every two fundamental units does not exceed 180 degrees. The condition that the reflectivity does not exceed 1 / 9 of that of a same size of metal plate can be achieved under the condition. The operation bandwidth of the random surface can be accurately estimated under the premise of not needing large-scale simulation; and the random surface has important engineering application value. The random surface can be applied to large-angle incidence through optimizing arrangement of the submatrixes; obvious scattering is avoided in all back scattering directions; and the random surface has a potential application prospect in the field of stealth.

Description

technical field [0001] The invention relates to a random surface whose bandwidth can be precisely controlled, which can be applied to stealth and imaging, and belongs to the field of radar detection and new artificial electromagnetic materials. Background technique [0002] When the electromagnetic wave is incident on the electromagnetic surface with phase gradient distribution, it no longer obeys the mirror reflection theorem, and abnormal reflection will occur, so the scattering pattern of the electromagnetic wave can be adjusted. By designing elements with low loss and different reflection phases, these elements are randomly arranged to form a random surface. When the surface is covered on a metal plate, when electromagnetic waves are incident, due to the different reflection phases of each unit, the reflected waves will interfere, and the energy will no longer be concentrated in the mirror direction, but random diffuse reflection will appear. This method is often used t...

Claims

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Application Information

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IPC IPC(8): H01Q15/14H01Q15/00
CPCH01Q15/00H01Q15/14
Inventor 程强赵捷王天奇陈浩崔铁军
Owner SOUTHEAST UNIV
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