Microstrip-line-fed reactively loaded circularly polarized annular-ring slot antenna

Jianxing LiSchool of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, China;Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA

Changqing WangSchool of Electronic and Electrical Engineering, Henan Normal University, Xinxiang, ChinaCorrespondence[email protected]

Anxue ZhangSchool of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, China

William T. JoinesDepartment of Electrical and Computer Engineering, Duke University, Durham, NC, USA

Qing Huo LiuDepartment of Electrical and Computer Engineering, Duke University, Durham, NC, USA

Abstract

A simple and novel reactively loaded annular-ring slot antenna (ARSA) fed by a microstrip line is proposed and investigated for circularly polarized (CP) radiation. An appropriate reactive component, i.e. lumped capacitor/inductor, is introduced across the annular-ring slot at a proper position to achieve CP radiation. To validate the design concept, a capacitively loaded ARSA (CL-ARSA) and an inductively loaded ARSA (IL-ARSA) were implemented and measured, showing that good CP characteristics have been attained. The measured 3-dB axial ratio (AR) bandwidths for the CL-ARSA and IL-ARSA are 5.5 and 6.7%, respectively.

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Microstrip-line-fed reactively loaded circularly polarized annular-ring slot antenna

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Microstrip-line-fed reactively loaded circularly polarized annular-ring slot antenna

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