In this paper, a three-layered frequency-selective absorber (FSA) that can efficiently absorb electromagnetic waves (EM) in double-band is proposed. The proposed structure designed so signals reflected from the frequency selective ground plane are located at 2.4 and 5.5 GHz (ISM UNII bands) absorbed by front resistive layers. Simulation results show not only blocks transmission desired bands bu...

Cavity reflex antenna (CRA) employing a circular patch type FSS (Frequency Selective Surface) superstrate is investigated. Analysis in terms of gain, bandwidth (impedance and gain) and radiation pattern has been presented. The aim of this work was to study low profile CRA having very thin superstrate sizes. In this CRA a circular patch antenna is used as a feeding source. The circular patch typ...

This paper deals with single layer Frequency selective surface (FSS) which acts as a double band reject filter. The two stop bands are really broad with percentage bandwidth of 26.67% and 14.53%. The maximum and minimum band separation for this proposed design is around 45 dB and frequency ratio is more than 1.9.This results are almost same for different incident angles.. This design is investi...

A dual-band directional antenna for Industrial, Scientific, and Medical (ISM) band application is proposed in this article. The consists of two layers substrates. first layer contains the square loop loading with a meander stub to realize dual band. second frequency selective surface (FSS) structure, which periodic array loops. phase shift from FSS reflection distance between are optimized fiel...

An emission frequency selective surface, or eFSS, is made up of a periodic arrangement of resonant antenna structures above a ground plane. By exploiting the coupling and symmetry properties of an eFSS, it is possible to introduce polarization sensitive thermal emission and, subsequently, coherent emission. Two surfaces are considered: a linearly polarized emission surface and a circularly pola...

In this paper, a complete design and analysis of the frequency selective property of an array of patches with annular rectangular slots is presented. It is observed that there is a tremendous decrease in resonance frequency as the annular rectangular slot is made on the patch and it is also seen that, with the incorporation of another annular rectangular slot, FSS is resonant at dual frequencie...