Abstract
A miniaturized frequency selective rasorber (FSR) with high selectivity passband and wideband absorption properties is presented. Its performance as an absorber over a wide absorption band from 8.08 to 18.08 GHz through the structure of metal incurved square loop structure loaded resistors. The frequency selective surface (FSS) using Jerusalem cross array and metallic patch realizes the transmission frequency band from 2.7 to 3.52 GHz. And the insertion loss (IL) is 0.37 dB at 3.08 GHz. The symmetry and miniaturized elements design enable the proposed FSR to achieve satisfactory incident angle stability. Its small unit size effectively avoids the generation of grating lobes in the absorption band and the interference to Radar Cross Section (RCS) reduction.
Highlights
In recent years, with the rapid development of metamaterials and metasurfaces, many technologies have been reported to improve the electromagnetic performance of radomes [1,2,3,4,5,6,7,8]
It is observed from the table that the frequency selective rasorber (FSR) we designed has a lower insertion loss (IL) in the low frequency range and a high absorption bandwidth in the high frequency range, which is difficult for works in other literatures
A Jerusalem cross aperture array and capacitive metal patch are used to generate of the high selective passband and reduce the unit size
Summary
With the rapid development of metamaterials and metasurfaces, many technologies have been reported to improve the electromagnetic performance of radomes [1,2,3,4,5,6,7,8]. To enhance the flexibility and application scope of FSR, some more complicated structures were designed Such as FSRs with two-sided absorption bands reported in [16,17,18,19], FSRs with high-frequency passband reported in [20,21,22,23], and employing the 3D FSS concept proposed in [24,25,26,27]. In order to achieve better transmitting characteristics in the low frequency band, the method of loading lumped capacitors on the Jerusalem cross was proposed in [29] This method is easy to produce grating lobes in the high frequency part. It has good angular stability under oblique incident
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