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Dual-Band Circularly-Polarized CPW-Fed Slot Antenna With a Small Frequency Ratio and Wide Bandwidths

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2 Author(s)
Can-Hui Chen ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Yung, E.K.N.

A novel dual-band circularly-polarized (CP) CPW-fed slot antenna is proposed in this communication. This antenna characterizes a small frequency ratio and wide CP bandwidths. The dual-band operations are realized by using two parallel monopoles, one curved monopole and one fork-shaped monopole. In addition, a crane-shaped strip is placed in the ground plane to achieve circular polarization. The experimental results show that the antenna has the axial ratio bandwidths of 9% for the lower band and 11% for the upper band. Both bands are left handed. The frequency ratio of the upper band to the lower band is 1.286 (1.98 GHz/1.54 GHz). Other characteristics such as impedance bandwidths, radiation patterns and gains will also be presented.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 4 )

Date of Publication:

April 2011

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