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WiMAX and C bands semi-fractal circularly polarized antenna with satellite bands filtering properties

Published online by Cambridge University Press:  07 May 2018

T. Sedghi Open the ORCID record for T. Sedghi [Opens in a new window] ,
T. Aribi  and
A. Kalami
T. Sedghi*
Affiliation:
Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
T. Aribi
Affiliation:
Department of Electrical Engineering, Miandoab Branch, Islamic Azad University, Miandoab, Iran
A. Kalami
Affiliation:
Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
*
Author for correspondence: T. Sedghi, E-mail: t.sedghi@iaurmia.ac.ir
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Abstract

A compact coplanar waveguide (CPW)-fed circular polarization (CP)-antenna for new generation applications with dual bands filtering performance along with CP feature based on unit-cell semi-fractal is proposed in this paper. The CP-antenna privileges from semi-fractal radiator causes to have a miniaturized size. The stopped bands are designed to suppress the interference with present WLAN and ITU-R satellite systems. These properties are obtained by embedding semi-fractal unit-cell patterns stubs at the radiator and applying two rectangular-shaped slits inside CPW ground plane and a pair of grounded L-shaped strips. By introducing the first step of semi-fractal strips, and the mirrored defected ground surface structures, dual-band rejection functionality at WLAN (5–6 GHz) and ITU-R (7.725–8.5 GHz) are practically obtained. Besides that, semi-fractal strips results to two orthogonal modes stimulation on the radiator and CP attribute are obtained at WiMAX (3.1–3.7 GHz). CP-antenna presents omni-directional radiation H-plane patterns over the applicational frequency band. The CP-antennas size is 25 mm × 25 mm and fabricated on commercially available FR4-epoxy substrate with 1 mm thickness. Measured results illustrate that the proposed ultimate CP-antenna with miniaturized structure, efficient impedance tuning characteristics, and adequate radiation performances is the best choice for new generation of wireless communications.

Keywords

Antennaband-notched functionalitycircular polarizationfractalsITU-R
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 8 , October 2018 , pp. 978 - 983
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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