Title :
Dual-Band Circularly-Polarized CPW-Fed Slot Antenna With a Small Frequency Ratio and Wide Bandwidths
Author :
Chen, Can-Hui ; Yung, E.K.N.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China
fDate :
4/1/2011 12:00:00 AM
Abstract :
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.
Keywords :
UHF antennas; antenna feeds; antenna radiation patterns; coplanar waveguides; multifrequency antennas; slot antennas; CP bandwidths; crane-shaped strip; curved monopole; dual-band circularly-polarized CPW-fed slot antenna; fork-shaped monopole; frequency 1.54 GHz; frequency 1.98 GHz; impedance bandwidths; parallel monopoles; radiation patterns; Antenna measurements; Bandwidth; Dual band; Impedance; Reflection; Slot antennas; Circular polarization; coplanar waveguide (CPW)-fed; dual-band; slot antenna;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2011.2109347
