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Wideband Circularly Polarized Antenna With Gain Improvement

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4 Author(s)
Zhi-ya Zhang ; Nat. Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi'an, China ; Neng-Wu Liu ; Jia-Yue Zhao ; Guang Fu

A wideband circularly polarized antenna with coaxial balun feed, using a broadband 90° hybrid feed network, is proposed. By introducing a narrow patch connecting the pair of bowtie dipoles as an entity that increases the effective radiation area, the proposed antenna delivers a higher gain than that of the conventional dual-fed-type circularly polarized antenna. It can achieve a measured impedance bandwidth for VSWR ≤ 1.5 of 57% and a 3-dB axial-ratio bandwidth of 51.8%. Moreover, the antenna has stable peak circularly polarized gain better than 9.0 dBi ranging from 1.1 to 1.6 GHz. For the entire half-power beamwidth, the axial ratio can be kept below 3 dB.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:12 )

Date of Publication:


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