Spatial filter based on artificial surface plasmon

Abstract

The invention proposes a spatial filter based on an artificial surface plasmon. The problems of narrow working frequency band and large cycle size in the prior art are solved. The spatial filter comprises a first dielectric plate (1), a second dielectric plate (2) and multiple metal branches, wherein the first dielectric plate (1) and the second dielectric plate (2) are stacked up and down. Each dielectric plate is composed of two dielectric substrates crossing each other to produce 8 planes. Multiple metal branches are combined in two forms. In one form, the metal branches are arranged in arccosine form, partially folded and combined to form a first kind of metal branch patches (3). In the other form, the metal branches are arranged in arc cosine form, partially folded, raised and combined to form a second kind of metal branch patches (4). The first kind of metal branch patches are printed on eight planes of the first dielectric plate. The second kind of metal branch patches are printed on eight planes of the second dielectric plate. Each branch is loaded with a resistor. According to the invention, the working frequency band is broadened; the cycle size of the structure is reduced; and the spatial filter can be used for reducing the radar cross section RCS.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a spatial filter which can be used to reduce the RCS of the radar scattering cross section. Background technique [0002] Surface plasmon is a mixed excited state formed by the interaction between free electrons bound on the interface between metal and dielectric and external photons. It is a type of surface electromagnetic wave, which generally propagates along the interface between metal and dielectric. , and decays exponentially in the direction perpendicular to the interface. Through the artificially designed special structure, the dispersion relationship similar to that of surface plasmons can be obtained, so that the artificial surface plasmons SSPP with unique electromagnetic field strong binding characteristics can be obtained. Because artificial surface plasmons have very good transmission and blocking characteristics for electromagnetic waves, they can rea...

AI Technical Summary

Problems solved by technology

In the high frequency band of SSPP, by introducing an elliptical gradient structure to widen the absorbing band with a stop band bandwidth of 8-12 GHz, the out-of-band absorbing characteristics of the antenna are realized. However, the structure has a narrow stop band bandwidth and corresponds to the high frequency band There are too few branches at the end of the ellipse, which makes the wave absorption effect in the high frequency band poor, resulting in a small transmission loss, which prevents the external wave from being well filtered out

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