Frequency Tunable Microwave Absorber
A microwave and frequency technology, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems of inability to change the absorption frequency and poor flexibility, and achieve the effect of simple production, convenient processing, and easy conformality
Active Publication Date: 2015-09-16
SOUTHEAST UNIV
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Problems solved by technology
However, this kind of electromagnetic absorber has poor flexibility, and the absorption frequency cannot be changed after the device is processed.
Method used
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[0021] The microwave absorber with adjustable frequency proposed by the present invention is composed of absorbing units on a sub-wavelength scale arranged along certain rules. The technical scheme adopted by a single absorbing unit is as follows: process two ELC units (capacitive inductive coupling unit) 1 on the upper surface of the dielectric substrate 2, and weld the two units 1 with a varactor diode 7 . Two metal strips 3 are processed on the lower surface of the dielectric substrate 2 to serve as DC feeders. Two metallized through holes 6 are drilled inside the dielectric substrate 2 to connect the DC feeder 3 and the positive and negative poles of the varactor diode 7 for applying a reverse voltage bias to the varactor diode 7 . The lower surface of the dielectric substrate 2 is covered with an ultra-thin insulating layer 4, and the lower surface of the insulating layer 4 is covered with a metal plate 5. The metal plate 5 is used to prevent the transmission of electroma...
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The invention provides a frequency-adjustable microwave absorber, which is formed by a plurality of wave absorbing units on the sub wave length dimension through regular arrangement in the orthogonal direction. The frequency-adjustable microwave absorber is characterized in that capacitance and inductance coupling units are processed on the upper surface of a medium base plate, variable capacitance diodes are used for welding the adjacent capacitance and inductance coupling units, the positive and negative electrodes of each variable capacitance diode are respectively connected with a direct current feed line arranged at the back side of the medium base plate through one metallization through hole, all feed lines are combined into a feed network, the feed network at the lower surface of the medium base plate is divided into two parts including a positive part and a negative part, the two parts are respectively connected with the negative electrodes and the positive electrodes of all of the variable capacitance diodes, and the reverse bias is exerted on all of the variable capacitance diodes arranged on the upper surface of the medium base plate, and the current voltage source voltage is regulated in a range not exceeding the breakthrough voltage value of the variable capacitance diodes for changing the equivalent parameters of the variable capacitance diodes. The frequency-adjustable microwave absorber has the adjustable characteristics, the absorption frequency points in the wider bandwidth range are continuously adjustable, in addition, the regulation is very convenient, and wide application prospects can be realized in the fields of invisibility, radiation meters and the like.
Description
technical field [0001] The invention relates to an electromagnetic wave absorber used in a microwave frequency band, belonging to the field of radar and new artificial electromagnetic materials. Background technique [0002] The new artificial electromagnetic materials (Metamaterials) in the present invention is an emerging research field in electromagnetism, and its basis is the equivalent medium theory, which consists of a series of artificially designed units arranged according to certain rules on the sub-wavelength scale. By carefully designing the cell structure and size, the required equivalent permittivity and permeability can be obtained. After more than ten years of development, new artificial electromagnetic materials have been greatly developed, and they are widely used in stealth and antenna engineering. Microwave absorbers based on new artificial electromagnetic materials use the resonance characteristics of new artificial electromagnetic units to achieve i...
Claims
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IPC IPC(8): H05K9/00
Inventor 程强赵捷陈洁潘柏操周永春崔铁军
Owner SOUTHEAST UNIV