Abstract
A frequency selective rasorber (FSR) with three transmission bands and three absorption bands is proposed in this paper. The FSR is constructed via cascading a lossy resistive surface and a multiple bandstop frequency selective surface (FSS) separated by air spacer. The transmission characteristics are obtained by the impedance poles of the interdigital capacitor-meander inductor resonators in the resistive surface and also the rectangular loop resonators in the FSS. The absorption bands are achieved using the ohmic loss of the resistors in the resistive surface along with the reflections of the FSS. The physical principle of operation of the multiband FSR is explained based on an equivalent circuit model. A prototype is fabricated and measured. The experimental results exhibit three transmission bands at 6.1 GHz, 8 GHz and 10 GHz with insertion loss below 0.9 dB, 0.8 dB and 0.8 dB, respectively. The effective absorption bands are in range of 7.05 GHz - 7.55 GHz, 8.87 - 9.35 GHz and 12.59 GHz - 14.22 GHz, respectively. The simulation results show the angular stability of the FSR response. In addition, the effect of FSR dimensions on the transmission/absorption bands is studied.
Highlights
In the past decades, frequency selective surfaces (FSS) have been attracting attention due to their applications in reduction of radar cross section (RCS), electromagnetic compatibility (EMC), electromagnetic security of buildings, resonant cavity antennas, etc [1]–[4]
We presented a multiband frequency selective rasorbers (FSR) structure supporting three transmission bands and three absorption bands arranged alternately in the frequency spectrum
This paper presents a multiband FSR which has three transmission bands and three absorption bands distributed alternately
Summary
Frequency selective surfaces (FSS) have been attracting attention due to their applications in reduction of radar cross section (RCS), electromagnetic compatibility (EMC), electromagnetic security of buildings, resonant cavity antennas, etc [1]–[4]. The reflected waves may be detected by a bi-static radar, which is a critical issue in aircraft stealth function To overcome this challenge, frequency selective rasorbers (FSR) were proposed with a transmission band along with a broad absorption band [6], [7]. An FSR is designed by cascading a lossy resistive surface with a transmission window and a lossless bandpass FSS [8]–[10]. For the double-layer FSA structures, the transmission performance of the pass band is determined by combining the insertion loss of both the resistive surface and the bandpass FSS. The gaps between the stop bands coincide with the transmission windows of the resistive surface This ensures the low loss and the wide bandwidth of the pass-bands.
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