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Circularly polarized beam-steering antenna array with enhanced characteristics using UCEBG structure

Published online by Cambridge University Press:  08 April 2015

Tohid Aribi
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Mohammad Naser-Moghadasi*
Affiliation:
Faculty of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
R. A. Sadeghzadeh
Affiliation:
Faculty of Electrical and Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran
*
Corresponding author: M. Naser-Moghadasi Email: mn.moghaddasi@srbiau.ac.ir

Abstract

A broadband circularly polarized (CP) beam-steering antenna array is presented. CP antenna is composed of four identical CP slot elements with 2 × 2 configuration and a 4 × 4 feeding network. CP slot element is utilized in array form to improve impedance bandwidth and sequentially rotation method is used to increase axial-ratio bandwidth. Moreover, uni-planer compact electromagnetic band-gap structure is applied to enhance the overall performance of antenna array. Measured results depict that the array has impedance bandwidth over a frequency range of 4.1–7 GHz (~53%) for S11 ≤ −10 dB and 3 dB axial-ratio bandwidth of 1.95 GHz that is between 4.6 and 6.55 GHz (~35%). The antenna array has peak gain of 11 dBi at 5.5 GHz.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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