Abstract
A 3-D frequency-selective rasorbers (FSR) with wide absorption bands at both sides of the transmission window based on stepped impedance resonator (SIR) is presented and investigated in this article. The proposed FSR features thin thickness, wide absorption bands and lumped-element-free characteristics. The transmission channel is constructed from a parallel waveguide based on SIR to provide the transmission path and reduce the thickness of the whole structure. The absorption channel is filled with magnetic absorber to provide a wide absorption band, while meander-line in shunt connection with the absorber is used to avoid lumped components and to obtain a low insertion loss at the passband. The detailed design concept and analysis are illustrated and the fundamental operating principle of the FSR is demonstrated with the help of an equivalent circuit model (ECM). A design example is provided and it exhibits a passband at 7.1 GHz with a transmission bandwidth of 22.6% for less than 3 dB insertion loss and fractional bandwidth of 128.0% with reflectivity less than −10 dB. Moreover, one dual-polarized FSR is also designed and analyzed to generalize the design strategy. Both single- and dual-polarized prototypes are designed, fabricated, and measured to verify the design concept. Good agreement can be observed between the simulated and measured results.
Highlights
Frequency-selective rasorber (FSR) [1], termed as absorptive frequency-selective transmission structure (AFST) in [2]–[4] and absorptive frequency-selective surface (AFSS) in [5], [6], has attracted increasing interest due to its importance in numerous applications aiming to reduce radar cross-section (RCS) of antenna systems and to improve the communication security
A design of 3-D frequency-selective rasorbers (FSR) based on magnetic absorber and stepped impedance resonator (SIR) with wide absorption bands, thin thickness and lumped-component-free characteristics is initially presented for single-polarized applications
The absorption channel is mainly constructed by a short-circuited parallel-plate waveguide filled with magnetic absorber at the end and a bypassing
Summary
Frequency-selective rasorber (FSR) [1], termed as absorptive frequency-selective transmission structure (AFST) in [2]–[4] and absorptive frequency-selective surface (AFSS) in [5], [6], has attracted increasing interest due to its importance in numerous applications aiming to reduce radar cross-section (RCS) of antenna systems and to improve the communication security. A design of 3-D FSR based on magnetic absorber and SIR with wide absorption bands, thin thickness and lumped-component-free characteristics is initially presented for single-polarized applications. Meander-line is used to subduct the lumpedelements and replace the series L-C circuit, resulting in a short circuit at the resonant frequency of the passband and a low insertion loss can be achieved within the transmission band. Based on this construction, a dualpolarized FSR employing a symmetrical structure is further proposed. The absorption channel is mainly constructed by a short-circuited parallel-plate waveguide filled with magnetic absorber at the end and a bypassing
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