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Journal of Electromagnetic Waves and Applications Volume 26, 2012 - Issue 11-12
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Articles

A low-profile CP microstrip antenna with broad beamwidth based on loading with curved microstrip resonant structures

W.-Q. Cao Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China; State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, ChinaCorrespondence[email protected]
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B.-N. Zhang Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China
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A.J. Liu Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China
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T.-B. Yu Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China
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D.-S. Guo Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China
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Y. Wei Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China
&
Z.-P. Qian Institute of Communications Engineering, PLA University of Science and Technology, 2 Biaoying at YuDao Street, Nan Jing, Jiangsu, 210007, China; State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
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Pages 1602-1610 | Received 18 Mar 2012, Accepted 04 Jun 2012, Published online: 19 Jul 2012
 
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Abstract

A novel low-profile circularly polarized (CP) microstrip antenna with broad beamwidth is presented. A four-way power divider made by three Wilkinson power dividers is designed to feed this antenna. With eight curved microstrip resonant structures loaded around the circular radiating patch, the designed antenna has a height of only about and exhibits broad beamwidth for both -plane and -plane. The relation between the antenna radiation property and the resonant loading structures is analyzed and discussed. Measurement results show that the 3 dB beamwidth of the fabricated one is more than with good CP performance (axial ratio [AR] < 4 dB). Thus, this antenna can be used in occasions when CP antenna with broad beamwidth performance is desired.

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