Broadband wave absorbing material based on frequency selective surface
A wave-absorbing material and base material technology, applied in the field of wave-absorbing materials, can solve the problems of unsatisfactory, limited mechanical properties of materials, lack of large-scale promotion, etc., and achieve good wave-absorbing effect
Active Publication Date: 2015-04-22
KUANG CHI INST OF ADVANCED TECH
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Problems solved by technology
[0004] The existing wave-absorbing materials make use of the absorption properties of each material for electromagnetic waves. By designing the components of different materials, the mixed materials have wave-absorbing properties. The design of such materials is complicated and does not have large-scale promotion. The mechanical properties of the material are limited by the mechanical properties of the material itself, which cannot meet the needs of special occasions
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[0022] Please refer to figure 1 , figure 1 It is a schematic diagram of the three-dimensional structure of the broadband absorbing material of the present invention. figure 1 Among them, the broadband absorbing material includes a first base material 10 and a second base material 20 that are closely attached to each other. A plurality of resonant units 30 are arranged on the outer surface of the first base material 10, and a reflection unit 30 is attached to the outer surface of the second base material 20. layer (not shown in the figure).
[0023] In order to achieve the impedance matching effect, the dielectric constant of the first substrate 10 is smaller than that of the second substrate 20 . Preferably, the first substrate 10 can be made of FR-4 material, and the second substrate 20 can be made of Rohacell material. The Rohacell material refers to the polymethacrylic imide rigid foam material produced by Evonik. More preferably, the thickness of the first substrate 10...
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The invention discloses a broadband wave absorbing material based on a frequency selective surface. The broadband wave absorbing material comprises a first substrate and a second substrate which are in close contact with each other. A plurality of resonant units are distributed on the external surface of the first substrate. A reflecting layer is attached onto the external surface of the second substrate. Each resonant unit comprises a metal frame and a metal block in the center of the metal frame. By using a frequency selective surface principle to design the broadband wave absorbing material and by designing the resonant units with a specific shape and / or size, the broadband wave absorbing material provided by the invention has a good wave absorbing effect at frequency of 7.5GHz to 18GHz.
Description
technical field [0001] The invention relates to a wave-absorbing material, in particular to a broadband wave-absorbing material based on a frequency selective surface. Background technique [0002] With the rapid development of science and technology, there are more and more technologies and various products that use electromagnetic waves as the medium, and the impact of electromagnetic radiation on the environment is also increasing. For example, radio waves may cause interference to the airport environment, causing aircraft flights to fail to take off normally; mobile phones may interfere with the work of various precision electronic medical devices; even ordinary computers will radiate electromagnetic waves carrying information, which may It is received and reproduced kilometers away, resulting in the leakage of national defense, political, economic, technological and other intelligence. Therefore, controlling electromagnetic pollution and finding a material that can res...
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IPC IPC(8): H01Q17/00H01P1/20
Inventor 刘若鹏赵治亚寇超锋叶金财
Owner KUANG CHI INST OF ADVANCED TECH