Broadband wave-absorbing frequency selection surface

A technology for selecting the surface and wave frequency, applied in the field of electromagnetic metamaterials, can solve the problems of limited practical application, high surface quality and density, large volume, etc., and achieve the effect of simple structure, easy processing, and good angular stability

CN110165421APending Publication Date: 2019-08-23NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-08-23

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a broadband wave-absorbing frequency selection surface, and the surface comprises an upper dielectric plate and a lower dielectric plate, wherein an air layer is arranged between the upper dielectric plate and the lower dielectric plate, the surface of the upper dielectric plate is provided with periodically arranged double-ring metal patches, both the inner square ring metal patch and the outer square ring metal patch are loaded with resistors, and the lower dielectric plate is a metal plate. The problems that an existing wave absorber is large in thickness and narrowin wave-absorbing frequency band can be effectively solved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of electromagnetic metamaterials, and in particular relates to a frequency selective surface. Background technique

[0002] Frequency Selective Surface (FSS) is composed of periodically arranged metal patches or gaps, which has good spatial filtering characteristics and can reflect out-of-band electromagnetic waves while transmitting in-band electromagnetic waves.

[0003] Electromagnetic wave absorbers can be used to reduce the radar scattering cross-sectional area and realize radar stealth. Microwave absorber design requires wide bandwidth and small thickness. The earliest wave absorber, the Salisbury screen, consists of a resistive film, a dielectric, and a metal bottom plate. When the thickness of the medium is a quarter of the wavelength, the free space matches the impedance of the absorber to produce a wave-absorbing effect. However, this absorber has a narrow absorption bandwidth and a thicker thic...

Examples

Embodiment Construction

[0017] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, the broadband wave-absorbing frequency selective surface designed by the present invention includes upper and lower layers of dielectric plates, an air layer is between the two layers of dielectric plates, and the surface of the upper layer of dielectric plates is provided with two ring metal patches arranged periodically, each A square ring metal patch is loaded with a resistor, and the lower dielectric board is a metal plate. Preferably, a resistor is connected in series at the midpoint of each side of each square ring metal patch.

[0019] figure 2 Equivalent circuit diagram of the broadband absorbing frequency selective surface designed for the present invention. Each square ring in the two rings is equivalent to a capacitor (C in the figure 1 、C 2 ), inductance (L 1 , L 2 ) and resistance (R 1...