A Novel Dual-Band Frequency Selective Surface Absorber

Mudassar Abdin,Fahad Malik,Shahzaib Qasim,Umair Rafique,M Mansoor Ahmed,M Arif Khan

doi:10.5923/j.ijea.20120206.08

Abstract

In this paper, a dual-band Frequency Selective Surface (FSS) absorber is presented for Wireless Local Area Network (W LAN) security. The FSS absorber is designed for two frequencies of interest, i.e., 2.45 GHz (lo wer band) and 5.25 GHz (upper band), respectively. FSS design consists of two layers; first layer consists of conducting square-loop elements while second layer consists of resistive square-loop elements, placed in-front of a conducting FSS layer. The proposed FSS design provides good frequency stability for oblique incidences for perpendicular (TE) and parallel (TM ) polarizations. It provides better absorption rate for 2.45 GHz and 5.25 GHz frequency bands and allow the t ransmission of other microwave frequencies. Also, the proposed FSS design reduces multipath fading of additional WLAN signals which occurred due to the placement of conducting FSS layer. Presented results demonstrate that the proposed FSS design has a stable frequency response for the desired frequency bands for TE and TM polarizations with good absorption rate when the incident wave angle varied fro m 0 0 to 45 0 .

Highlights

Now-a-days, the use of Frequency Selective Surfaces (FSSs) is beco ming popular as a free-space filter design
Other applications associate d with FSSs are radar and analog absorbers[3,4], High Impedance Surfaces (HISs) for the enhancement of bandwidth and gain of an antenna[5], band-pass filter design for the transmission of radio frequencies through energy saving windows[6], resonator design or Electro magnetic Band-Gap (EBG) structure for the coupling reduction between microstrip patch antennas[7], quarter-wave polarizer to change the polarizat ion of incident wave[8], etc
As WLANs are based on radio frequency (RF), the information which transmitted fro m one point to another can be hacked or tapped by intruders

Summary

Introduction

Now-a-days, the use of Frequency Selective Surfaces (FSSs) is beco ming popular as a free-space filter design. In[14], authors presented same kind of FSS absorber as that of[13] for single band operation They used lossy dielectric slab and due to the use of this technique they got good frequency stability at different incident angles. In[15], authors presented a simple fractal FSS structure to get International Journal of Electromagnetics and Applications 2012, 2(6): 182-185 frequency stability They have designed different structures for different incident angles. In[16,17], authors presented fractal shaped band-stop and band-pass FSS to get stability at maximu m angle of incidence. They have presented good frequency stability, but the presented designs are difficult to model and fabricate.

Design and Configuration of Dual-Band FSS Absorber

Simulation Results and Discussions

Conclusions