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Journal of Electromagnetic Waves and Applications Volume 29, 2015 - Issue 14
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Articles

Strip-coupling circularly polarized antenna and its same-sense bidirectional array

Jianjun WuNational Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Taibai South Road 2, Yanta District, Xi’an, Shaanxi710071, ChinaCorrespondence[email protected]
,
Ruina LianNational Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Taibai South Road 2, Yanta District, Xi’an, Shaanxi710071, China
,
Zedong WangNational Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Taibai South Road 2, Yanta District, Xi’an, Shaanxi710071, China
&
Yingzeng YinNational Laboratory of Science and Technology on Antennas and Microwaves, Xidian University, Taibai South Road 2, Yanta District, Xi’an, Shaanxi710071, China
Pages 1859-1866 | Received 27 Jan 2015, Accepted 04 Jun 2015, Published online: 04 Aug 2015
 
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Abstract

A strip-coupling antenna and its bidirectional array with the same-sense circular polarization are introduced. By placing a bending strip above a narrow slot, circular polarization is obtained by combing the electric and magnetic currents. An array consisting of a three-element long slot and coupled strips on both sides of the slot is then constructed for bidirectional radiations with high gain. The fabricated antenna array shows wide bandwidth of 16.6% (2.16–2.55 GHz) for |S11| < −10 dB and 5.8% (2.33–2.47 GHz) for axial ratio  <3 dB. In addition, same-sense bidirectional radiation patterns are also achieved with a high gain over 6.5 dBic.

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