A bandwidth expanding microwave absorber based on cavity resonance and lumped elements

A technology of lumped components and wave absorbers, applied to electrical components, antennas, etc., can solve problems such as narrow working frequency band, easy to be limited, easy to generate frequency deviation, etc., and achieve the effect of popular structure, strong functionality and flexible design

Active Publication Date: 2018-12-25
NANJING UNIV OF POSTS & TELECOMM
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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 prac

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  • A bandwidth expanding microwave absorber based on cavity resonance and lumped elements
  • A bandwidth expanding microwave absorber based on cavity resonance and lumped elements
  • A bandwidth expanding microwave absorber based on cavity resonance and lumped elements

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[0032] The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0033] The present invention is a wave absorber based on cavity resonance and bandwidth expansion of lumped elements, such as Figure 1 to 7 As shown, its structure is composed of a bottom reflector, a dielectric substrate, an air column, a solid plasma resonance unit and a plasma excitation source controlled by a programmable logic array. The bottom reflector is provided with a dielectric substrate, and the dielectric substrate has For FR-4 with a larger loss tangent, periodically arranged air columns are inserted into the dielectric substrate, and a solid plasma resonance unit is provided on the upper surface of the dielectric substrate. The solid plasma unit on the surface of the medium is composed of four separate split rings. The four rings are connected by solid plasma rods. The four externally connected solid plasma rods are all cut...

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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...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/007
Inventor 章海锋张浩杨靖刘佳轩
Owner NANJING UNIV OF POSTS & TELECOMM
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