A Broadband Absorber Based on Cavity Resonance and Lumped Elements

Abstract

The invention discloses a bandwidth expanding microwave absorber based on cavity resonance and lumped elements, which comprises a bottom metal reflector plate, a dielectric substrate above the metal plate, and solid-state plasma resonance units on the dielectric substrate, wherein the resonance units are electrically connected with one other through resistors, and an air column inserted in the dielectric substrate. The absorber can absorb both TE polarized waves and TM polarized waves, and the excitation region of the resonant units composed of solid-state plasma can be programmed to excite different resonant units so as to achieve the purpose of dynamically regulating different frequencies of the microwave absorber; moreover, the working frequency of the absorber can cover multiple bandswhen the excitation region is selected properly, and the absorber can absorb lower frequency electromagnetic waves in a smaller physical size. The absorber has the characteristics of simple structure,programmable control, flexible design and strong functionality.

Description

technical field [0001] The invention relates to an ultra-broadband wave absorber, in particular to a wave absorber based on cavity resonance and bandwidth expansion of lumped elements, belonging to the technical fields of radio communication and microwave devices. Background technique [0002] Nowadays, the electromagnetic radiation generated by electronic equipment floods the surrounding living environment, causing electromagnetic pollution to people's lives, and endangering people's health to a certain extent. Due to the characteristics of low reflectivity, the absorbing material can effectively lose the electromagnetic wave entering its interior, which makes it have broad application prospects in electromagnetic protection and electromagnetic shielding. Common absorbing materials include ferrite absorbing materials, magnetic Absorbing materials, chiral materials, etc. Electromagnetic metamaterials are usually defined as an artificial medium with unusual properties not fo...

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Problems solved by technology

For single-frequency or multi-frequency electromagnetic metamaterial absorbers, the absorption rate can reach very high, but the working frequency band is narrow, and frequency deviation is easy to occur, which is very easy to be limited in practical applications, so widening the frequency band is bound to become Research Trends of Electromagnetic Metamaterial Absorbers

Moreover, the biggest defect of conventional absorbers is that it is difficult to obtain a tunable absorption spectrum

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