CST – Computer Simulation Technology

Monofilar Spiral Slot Antenna for Dual-Frequency Dual-Sense Circular Polarization
Xiu Long Bao, Max J. Ammann
IEEE Transactions on Antennas and Propagation
Volume: 59, Issue: 8, August 2011
Dual circular polarization, dual frequency, spiral slot antenna.
Adual-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 ?? 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.

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