Two frequency-selective rasorber (FSR) structures using novel centrosymmetric bended-strip resonator (CBSR) are proposed in this paper. Both FSRs consist of the resistive sheet layer and the bandpass FSS layer with an air gap in the middle. The resistive sheet layer is constructed by inserting the CBSR into the center of the resistor-loaded dipole. The CBSR resonates at the transmission band of the bandpass FSS and exhibits infinite impedance, which is used to realize high-transmittance performance at the transmission band. The full wave simulation results show that the transmission band of one FSR is above the absorption band (A-T FSR), while the transmission band of another FSR is below the absorption band (T-A FSR). The transmission band of the AT FSR and T-A FSR are separately located at 12.76 and 6.08 GHz with 0.66-and 0.13-dB insertion loss, and the corresponding absorption bands with absorption rate >90% are located at 6.10-10.98 GHz and 9.04-15.94 GHz, respectively. The CBSR used in T-A FSR (M-CBSR) is a miniaturized design of the CBSR used in AT FSR. Comparing with the CBSR structure, the electric length of the M-CBSR's longer side is reduced to about 50%, which is only 12.2% of the wavelength of the transmission band. Two prototypes are fabricated and measured to verify the absorption/transmission performance of the proposed FSRs. The measured results are in good agreements with simulated results, which evidently demonstrates the validity of the proposed design. INDEX TERMS Frequency-selective rasorber (FSR), centrosymmetric bended-strip resonator, transmission band below the absorption band, transmission band above the absorption band.
A design to achieve frequency-selective rasorber (FSR) and reflector with two-sided absorption bands is proposed. The theoretical analysis and the calculation method for the structure parameters are presented by utilizing the equivalent circuit model. The reflector and the rasorber are designed in simple 2-D structures, consisting of only one layer of resistive sheet and a pure ground or a bandpass frequencyselective surface, respectively. Based on the analysis of the condition for realizing two-sided absorption, we found that the parameters of each element in the resistive sheet are correlative and proportional to each other. The calculation method of actual physical dimensions of the proposed structure is provided, so the element sizes of unit cell structure can be calculated and designed to approximate the desired values. Hence, based on these proposed methods, the perfect two-sided absorption FSR or reflector can be realized directly when the deduced relationship of the parameters is satisfied. Therefore, the approach of impedance matching becomes much easier. The simulation results show the two wideband absorption bands located above and beneath the reflection/transmission band. An FSR and a reflector are designed, fabricated, and measured. The measurement results match well with the simulation results and verify the designing principle. The FSR realizes the two-sided absorption bands at 2.1-5.1 and 11.9-17.5 GHz and a transmission band at 9.7 GHz. The reflector shows a wide reflective bandwidth and two wide absorption bands at 2.8-6.5 and 12-17.4 GHz. INDEX TERMS Frequency selection rasorber (FSR), reflector, two-sided absorption, radar cross section reduction (RCSR).
State of polarization of light is one of the fundamental characters of light and has great significance to optical communication, imaging, quantum optics and medical facilities. The generation and maintenance...
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