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Title of Journal: Wireless Pers Commun

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Abbravation: Wireless Personal Communications

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Springer US

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DOI

10.1007/s00398-014-1083-x

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1572-834X

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Broadband Circularly Polarized 2 × 2 Antenna Array

Authors: Tohid SedgeechongaralouyeYekan Mohammad NaserMoghadasi R A Sadeghzadeh
Publish Date: 2016/07/05
Volume: 91, Issue: 2, Pages: 653-660
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Abstract

In this paper a unique broadband circularly polarized antenna array with sequentially rotated feednetwork for Cband applications is proposed In order to implement presented array element a novel and miniaturized square slot antenna with one pair of attached Lshaped and a Tshaped strips at ground surface for decreasing cross polarization purity is presented Two Lshaped strips with different length are inserted at slot antenna’s patch to enhance impedance matching The symmetric coplanar waveguide is used for feeding the slot element The antenna element obtains a 3 dB axial ratio bandwidth from 585 to 625 GHz For further improving of radiation attributes elements in 2 × 2 array are linked together by sequentially rotated feed to achieve wider axial ratio and impedance matching bandwidths The main advantage of feed network is designed in a way that to have less coupling effect between elements The axial ratio AR and impedance bandwidths of array is from 49 to 645 GHz for AR 3 dB and 4 to 81 GHz for VSWR 2 respectively Simulation and measurement results validated the proposed array design

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