A frequency selective surface with absorption-reflection-absorption properties

A technology of frequency selective surface and absorption characteristics, applied in antennas, electrical components, etc., can solve problems such as large thickness, limited material thickness and weight, affecting antenna radiation performance, etc.

Active Publication Date: 2020-12-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past few decades, it has been proposed to use metamaterial absorbers to reduce RCS, but it is usually limited by the thickness and weight of the material itself
In addition, some people use polarization conversion metasurface and artificial magnetic conductor surface to achieve low RCS performance. Although this structure can reduce its own weight to a certain extent, it often has a large thickness.
In addition, achieving low RCS performance in a wider frequency band often affects the radiation performance of the antenna in its operating frequency band at the same time

Method used

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  • A frequency selective surface with absorption-reflection-absorption properties
  • A frequency selective surface with absorption-reflection-absorption properties
  • A frequency selective surface with absorption-reflection-absorption properties

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Embodiment Construction

[0014] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0015] The present invention provides a frequency-selective surface with absorption-reflection-absorption characteristics. In order to better explain the principle of the present invention, a theoretical analysis can first be carried out on a metal strip with a chip resistor welded in its center. Because when the plane wave is incident, an induced current will be generated on the metal strip, and when the current flows through the chip resistor, the energy of the electromagnetic wave will be dissipated by being converted into heat energy. According to the principle of reciprocity, the metal strip welded with chip resistors in the center can be equivalent to a center-fed dipole antenna, so the current distribution is:

[0016]

[0017] Among them, I 0 is the current amplitude of a fixed size, λ is the wavelength, is the wave number, and l is the lengt...

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Abstract

The invention discloses a frequency selective surface with an absorption-reflection-absorption characteristic. The frequency selective surface comprises a dielectric substrate and a plurality of metalunits arranged in a rectangular period, wherein the metal units are arranged on the upper surface of the dielectric substrate; each metal unit comprises four identical rectangular metal strips with gaps; each gap is from a vertex to the 3 / 4 part of a long side where the vertex is located; a chip resistor is welded at the 1 / 2 part of the total length of the metal strips; by taking one point in onerectangular metal strip as the rotating center, rotation is performed by 90 degrees, 180 degrees and 270 degrees in sequence; and the positions of the rectangular metal strips which are not crossed and overlapped mutually are determined. A reflective plate as an antenna can ensure the radiation performance of the antenna while reducing the RCS of the antenna.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a frequency selective surface with absorption-reflection-absorption characteristics. Background technique [0002] With the rapid development of stealth technology and wireless communication systems, a platform with low observability is of great significance, and the antenna as a special scattering source, reducing its radar cross section (RCS) has gradually caused more and more attention Notice. In the past few decades, the use of metamaterial absorbers has been proposed to reduce RCS, but it is usually limited by the thickness and weight of the material itself. In addition, some people use polarization conversion metasurface and artificial magnetic conductor surface to achieve low RCS performance. Although this structure can reduce its own weight to a certain extent, it often has a large thickness. In addition, achieving low RCS performance in a wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00
CPCH01Q15/0013
Inventor 金城张彬超吕奇皓陈建宏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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