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Small circularly polarised folded patch antenna

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4 Author(s)
H. Wong ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; P. -Y. Lau ; K. -M. Mak ; K. -M. Luk

A small circularly polarised (CP) patch antenna with dual T-shaped probe feeds is presented. The patch is folded like a cap to generate a CP wave as well as to reduce the size of the antenna. The proposed antenna is operated at the centre frequency of 2.28 GHz with circular polarisation. The impedance bandwidth (SWR<2) is 21.8% from 2 to 2.49 GHz and the axial ratio bandwidth (AR<3 dB) is 3.5%. The measured gain is around 7.5 dBi. The antenna shows a good CP performance with a symmetric radiation pattern. The total area of reduction is 54% in comparison with the conventional half-wave patch antenna.

Published in:

Electronics Letters  (Volume:41 ,  Issue: 25 )