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Reactive impedance surface-based broadband circularly polarized Koch fractal boundary microstrip antenna

Published online by Cambridge University Press:  22 December 2014

V. V. Reddy  and
N.V.S.N. Sarma
V. V. Reddy*
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Warangal, Telangana, India
N.V.S.N. Sarma
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Warangal, Telangana, India
*
Corresponding authorV. V. Reddy Email: [email protected]
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Abstract

A circularly polarized (CP) broadband antenna is proposed for wireless applications in the range of 2–3 GHz frequency. It consists of asymmetrical Koch fractal boundary patch over a reactive impedance surface (RIS) substrate. The simulations of single-layer Koch fractal antenna, dual layer with square and fractal RIS elements are carried out in a systematic way for broadband CP radiation and corresponding results are presented. For better CP characteristics, properties of fractal curves and dimensions of RIS elements are optimized. The antenna with fractal RIS iteration order one (iteration1) is experimentally studied. The 10-dB return loss bandwidth is 50.35%, whereas 3-dB axial ratio bandwidth is 7.45%, which indicate that by applying fractals concept to RIS technique, with a single probe feed, broadband CP radiation can be obtained.

Keywords

Circular polarizationBroadbandFractal boundaryAxial ratio
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 2 , March 2016 , pp. 243 - 250
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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