Abstract
This paper introduces an angular-insensitive dual-polarized 3-D absorptive frequency-selective transmission structure (AFST), which has a transmission window and an upper absorption band. The transmission band is produced by lossless resonators implemented using an aperture antenna embedded notched parallel plate waveguide with a metalized via hole in the center. The absorption band is obtained by lossy resonators constructed by the single resistor embedded bent metallic strips. In addition, the whole structure is constructed without backing discontinuous metallic ground plane, which overcomes the fabrication difficulty of conventional 3-D structures. Physical mechanism of the proposed AFST is explained with the aid of an equivalent circuit model, as well as current and electric field distributions. A prototype of the designed AFST is fabricated and measured, and experimental results show that a fractional transmission bandwidth of 20.5% and an upper absorption bandwidth of 28.8% with absorptivity around 90% for both TE- and TM-polarizations are achieved under oblique incident wave up to 50°.
Highlights
Frequency selective structures (FSSs) are widely known as a spatial filter for electromagnetic waves, which have been used in a large range of applications for their attractive frequency filtering characteristics [1]–[3]
Traditional FSSs are often designed as bandpass structures transmitting the in-band waves while reflecting the out-of-band waves, which prevent interference but results in a large radar cross section (RCS)
A new kind of structures termed as absorptive frequency-selective transmission structure (AFST) was
Summary
Frequency selective structures (FSSs) are widely known as a spatial filter for electromagnetic waves, which have been used in a large range of applications for their attractive frequency filtering characteristics [1]–[3]. The AFSTs perform unique characteristic of being transparent to incident EM waves in the passband and absorptive outside the passband, out-of-band RCS can be reduced. In order to obtain expectable transmission and absorption performances, various lossy resonant structures are utilized in the lossy layer to realize the absorption band, while a lossless resonance is built to generate the transmission band. These multilayer based AFSTs often suffer from large unit cell size and unstable filtering response over a large incident angle of waves. Most of the existing AFSTs have the feature of narrow transmission band and relatively large insertion loss
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