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Journal of Electromagnetic Waves and Applications Volume 30, 2016 - Issue 2
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Articles

A novel wideband circularly polarized dual-fed slot antenna with microstrip feeding network

Chi-Jung KuoGraduate Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei106, Taiwan, Republic of China
,
Chong-Yi LiouDepartment of Electrical Engineering, National Taiwan University, Taipei106, Taiwan, Republic of China
,
Jen-Chun YehGraduate Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei106, Taiwan, Republic of China
&
Shau-Gang MaoDepartment of Electrical Engineering, National Taiwan University, Taipei106, Taiwan, Republic of ChinaCorrespondence[email protected]
Pages 175-187 | Received 24 Feb 2015, Accepted 15 Sep 2015, Published online: 01 Dec 2015
 
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Abstract

This study presents the design of novel dual-fed circularly polarized (CP) antenna. This antenna consists of a tapered slot, a backside metal plate and a microstrip-fed delay line phase shifter. Based on the analysis of the radiation mechanism of antenna ground plane, the edge shape is optimized as a half-circle type to enhance the bandwidth of antenna gain and CP purity. The proposed antenna possesses a wideband return loss better than 10 dB in the range of 4.18–7.57 GHz, covering the bandwidth of axial ratio lower than 3 dB from 4.25 to 6.75 GHz. The measured antenna gain is approximately 9–10.5 dBic and the radiation patterns are broadside and consistent within the CP operating bandwidth.

Disclosure statement

No potential conflict of interest was reported by the authors.

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