Frequency-adjustable microwave absorber

An absorber, microwave technology, applied in electrical components, antennas, magnetic field/electric field shielding and other directions, can solve the problem that the absorption frequency cannot be changed, and achieve the effect of convenient processing, light weight and good absorption effect

Pending Publication Date: 2017-06-30

NANJING UNIV OF INFORMATION SCI & TECH

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AI-Extracted Technical Summary

Problems solved by technology

A single narrowband frequency will no longer apply

The fixed absorptio...

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Method used

The resonant unit group of sub-wavelength structure is made up of a plurality of resonant units, and each resonant unit is made up of the first metal horizontal bar, the first metal vertical bar, the two Ts that the second metal horizontal bar, the second metal vertical bar form type structure, plus a varactor diode between the first metal vertical bar and the second metal vertical bar. Two T-shaped metal sheets are equivalent to a planar dipole. The dielectric substrate FR-4 board has a dielectric constant of 4....

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Abstract

The invention discloses a frequency-adjustable microwave absorber. The frequency-adjustable microwave absorber comprises a medium substrate, an anti-transmission layer and resonance unit sets, wherein the multiple resonance unit sets are arranged on a top surface of the medium substrate with intervals, a back surface of the medium substrate is provided with the anti-transmission layer, the resonance unit sets comprise first metal horizontal stripes and second metal horizontal stripes, the first metal horizontal stripes and the second metal horizontal stripes are parallelly arranged, multiple sets of first metal vertical stripes and second metal vertical stripes which are oppositely arranged are arranged between the first metal horizontal stripes and the second metal horizontal stripes, and tail ends of the first metal vertical stripes and the second metal vertical stripes are connected through a variable capacitance diode. The frequency-adjustable microwave absorber is advantaged in that equivalent capacitance can be changed through an applied inverse bias voltage, so absorption frequency can be continuously adjusted in a quite wide scope, the structure is simple and easy to process, the conformal effect is realized, and the microwave absorber has quite high engineering application values.

Application Domain

Magnetic/electric field screeningAntennas

Technology Topic

Dielectric substrateVaricap +7

Image

Examples

Experimental program(1)

Example Embodiment

[0020] The present invention will be further explained below in conjunction with the drawings.

[0021] Such as Figure 1-Figure 3 As shown, a frequency-adjustable microwave absorber includes: a resonant unit group 1, a dielectric substrate 2, an anti-transmission layer 3. A plurality of resonant unit groups 1 are arranged on the top surface of the dielectric substrate 2 at intervals, and the dielectric substrate 2 An anti-transmission layer 3 is provided on the back side; the resonance unit group 1 includes: a first metal horizontal bar 11, a second metal horizontal bar 12, the first metal horizontal bar 11 and the second metal horizontal bar 12 are arranged in parallel, and the first A plurality of groups of oppositely arranged first metal vertical bars 13 and second metal vertical bars 14 are arranged between a metal horizontal bar 11 and a second metal horizontal bar 12, and each group of the first metal vertical bars 13, the second metal vertical bars The ends of the bars 14 are connected through a varactor diode 15.

[0022] The first metal vertical bars 13 and the second metal vertical bars 14 of each group are equally spaced between the first metal horizontal bars 11 and the second metal horizontal bars 12.

[0023] The first metal vertical bars 13 are vertically arranged below the first metal horizontal bars 11, and the second metal vertical bars 14 are vertically arranged above the second metal horizontal bars 12.

[0024] The sub-wavelength structure of the resonant unit group is composed of multiple resonant units. Each resonant unit is composed of two T-shaped structures composed of a first metal horizontal bar, a first metal vertical bar, a second metal horizontal bar, and a second metal vertical bar. Add the varactor diode between the first metal vertical bar and the second metal vertical bar. Two metal sheets with T-shaped structure are equivalent to a plane dipole. The dielectric substrate FR-4 board has a dielectric constant of 4.3 and a loss tangent of 0.027. When the electromagnetic wave with the polarization direction parallel to the y coordinate direction is incident from the front, a polarization current is formed, which is equivalent to an LC oscillator circuit. Adding different reverse bias voltages at both ends of the varactor diode changes the capacitance of the varactor diode, thereby changing the equivalent capacitance of the circuit, the resonant frequency changes, and the absorption frequency is continuously adjustable.

[0025] The dielectric substrate is an FR-4 board after 2mm, and a metal flat plate is attached to the lower surface of the dielectric substrate as an anti-transmission layer. Because the left and right adjacent resonant units are connected to each other, the edge of each row of resonant unit groups is broken. Figure 4 The S11 simulation result of the frequency changing with the capacitance of the varactor diode in the present invention is given. When the capacitance is 0.2V, the absorption frequency is 2.1G, and when the capacitance is 15V, the absorption frequency is 3.2G. From Figure 5 It can be seen that the absorption efficiency of 2.1-3.2G is above 90%, and the relative bandwidth is 43%.

[0026] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

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PUM

Property	Measurement	Unit
Thickness	2.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple structure
High engineering application value

Frequency-adjustable microwave absorber

An absorber, microwave technology, applied in electrical components, antennas, magnetic field/electric field shielding and other directions, can solve the problem that the absorption frequency cannot be changed, and achieve the effect of convenient processing, light weight and good absorption effect

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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