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Monofilar Spiral Slot Antenna for Dual-Frequency Dual-Sense Circular Polarization

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2 Author(s)
Xiu Long Bao ; Antenna & High Freq. Res. Centre, Dublin Inst. of Technol., Dublin, Ireland ; Ammann, M.J.

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.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 8 )