%0 Journal Article
%J IEEE Transactions on Antennas & Propagation
%D 2011
%T Monofilar Spiral Slot Antenna for Dual-Frequency Dual-Sense Circular Polarization
%A X. L. Bao
%A M. J. Ammann
%X A dual-band antenna with right-hand circular polarization for the first frequency and the counter polarization at the second frequency is realized with compact printed spiral slots. The coupled spiral slots are fed by a 50 Ω microstrip line. Dual-sense circularly-polarized performance is achieved by realizing oppositely-directed current rotation for the two frequency bands. A parametric study shows that the additional slot significantly improves the bandwidth for both frequency bands. Measured results show that the fractional impedance bandwidth is greater than 18% for both bands. The 3 dB axial-ratio bandwidths are 4.5% and 3.5% for the RHCP and LHCP bands, respectively.
%B IEEE Transactions on Antennas & Propagation
%V 59
%P 3061-3065
%8 08/2011
%U http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5871273
%N 8
%1 http://arrow.dit.ie/ahfrcart/27/
%R 10.1109/TAP.2011.2158964