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A bi-directional dual-bandwidth microwave absorber for applications in X and Ku bands

Published online by Cambridge University Press:  20 May 2019

Gobinda Sen  and
Santanu Das
Gobinda Sen*
Affiliation:
Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India
Santanu Das
Affiliation:
Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India
*
Author for correspondence: Gobinda Sen, E-mail: Gobinda.dets@gmail.com
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Abstract

This paper presents a microwave absorber with dual absorption bandwidth response based upon the direction of electromagnetic wave incident on the surface. The design unit cell comprises a staircase shape metallic patch on the top plane and an array of 2×2 meander square ring shape dual layer frequency selective surfaces (FSS) in the middle and bottom planes. The relative absorption bandwidth (RAB) of 39.40% (5 GHz) with more than 90% absorption of incident wave power is achieved when an electromagnetic wave impinges normally on the top plane making it suitable for wideband applications in the X and Ku bands. For the wave incident normally on the bottom plane, the same structure gives narrow band absorption with an RAB of 2.29% (260 MHz) for more than 90% absorption around 11 GHz. Thus, this bi-directional ability of the proposed design is found to be suitable for radar absorbing material, multi-bandwidth, and diverse applications. The absorption performance is also studied for different values of incident angle. The distribution of surface currents on the staircase patch and on the two FSS layers at resonant frequencies of 11 GHz and 14 GHz is analyzed to elaborate the absorption phenomenon physically. The prototype of this design is fabricated and the experimental results are found to be closely following the simulated one.

Keywords

Bi-directionaldual-bandwidthmicrowave absorbernarrowbandwideband
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 9 , November 2019 , pp. 983 - 987
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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