Frequency Selective Rasorber and Reflector With Two-Sided Absorption Bands

Abstract

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).

3-D Single- and Dual-Polarized Frequency-Selective Rasorbers With Wide Absorption Bands Based on Stepped Impedance Resonator

“…One is to use cascading multilayer 2-D frequencyselective surface (FSS) layers [10]- [24], and the other is employing 3-D structures where each unit is a multi-mode cavity [25]- [32]. In terms of performance, the FSR structures can also be divided into two types: 1) those with a one-sided absorption band with either lower or upper transmission band [5]- [7] and 2) those with a transmission band with two-sided absorption bands [2], [23]. As required in many practical FSR applications, the most important challenge is to expand the absorption bands, reduce the thickness of the whole structure and implement the polarization insensitivity at the same time.…”

Design of Dual-Polarized Frequency Selective Rasorber With Two Independent Transmission Windows Using Multi-Resonators

“…Generally, FSR can be sorted into three types with respect to the relative locations of the pass-band and the absorption band: 1) the pass-band below the absorption band [14][15][16], 2) the pass-band above the absorption band [17][18][19], and 3) the pass-band among the absorption band [20][21][22][23][24][25][26]. However, most of these FSRs have only one transmission band, which limits their applications in the multiband communication system.…”

Design Dual-Polarization Frequency Selective Rasorber Using Split Ring Resonators

“…As the incident angle increases, the insertion loss increases rapidly. In [19], the inductor and the capacitor are simplified to a microstrip structure, and the parameters of the equivalent circuit model can be calculated from the actual physical size. However, the absorption coefficient near the transmission band is not sufficient, which is disadvantageous for the reduction of the RCS.…”