Abstract
In this paper, a dual-polarized frequency selective rasorber (FSR) with two independent transmission windows and three absorption bands is designed and characterized. The proposed FSR is composed of the resistive sheet and the bandpass frequency selective surface (FSS), which are separated by the air spacer. At the top resistive sheet, two concentric modified square loops with different lengths are inserted into the square loop with four lumped-resistor-loaded legs, which provides two independent transmission windows. The bottom bandpass FSS, consisting of the combination of the square slot and the four-leg arrow shaped slot, is adopted to realize the same transmission bands as the upper resistive sheet. Performance of the proposed FSR is investigated via its equivalent circuit model and full-wave simulations. The simulated results exhibit dual-band frequency response, which has two independent transmission windows within three absorption bands. The two pass-bands operate at 8.5GHz and 13GHz with insertion loss of 0.31dB and 0.48dB, respectively. And the three absorption bands are in the range of 4.1GHz-7.5GHz, 9.1GHz-12.3GHz, and 14GHz-19.7GHz, respectively. Also, the band with reflection coefficient lower than −10dB covers from 4.2 GHz to 19.6GHz and the fractional bandwidth is up to 129.4%. Furthermore, prototype of the FSR is fabricated and measured. Good agreements between the measured and the simulated results can be observed.
Highlights
Frequency selective surface (FSS) is a periodic structure composed of identical constituting elements, which exhibits frequency filtering response [1], [2]
STRUCTURE AND EQUIVALENT CIRCUIT ANALYSIS Fig.1 shows the geometrical structure of the frequency selective rasorber (FSR), which is composed of the upper resistive sheet, the bottom bandpass FSS, and the air spacer
Two independent resonant paths are obtained with the design of three concentric resonators in the resistive sheet, which ensures the independent controllability of the two transmission windows
Summary
Frequency selective surface (FSS) is a periodic structure composed of identical constituting elements, which exhibits frequency filtering response [1], [2]. Due to its frequency filtering property, FSS has been widely applied in the field of microwave to construct hybrid radome, antenna reflector, EM shelter, and so on. When the FSS is applied to construct hybrid radome, the EM waves within the pass-band of FSS can pass through the radome with low loss and the outof-band EM waves will be reflected [3]–[5]. Considering the out-of-band EM waves are only reflected rather than absorbed, the reflected EM waves can be detected by the bistatic radar system. The FSS loaded hybrid radome is only suitable for monostatic RCS reduction.
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