Title :
Varactor-diode loaded passive polarisation-agile patch antenna
Author :
Haskins, P.M. ; Dahele, J.S.
Author_Institution :
Sch. of Electr. Eng. & Sci., R. Mil. Coll. of Sci., Shrivenham
fDate :
6/23/1994 12:00:00 AM
Abstract :
A passive polarisation-agile microstrip patch antenna has been developed. Using independently biased varactor diodes on the patch axes to tune or detune orthogonal modes, it can produce linear polarisation, or left or right hand circular polarisation according to the bias voltages. Crosspolar levels when operated in the linear state, and axial ratios in the circular state can be optimised by fine adjustment of the diode bias
Keywords :
antenna radiation patterns; diodes; electromagnetic wave polarisation; microstrip antennas; microwave antennas; varactors; axial ratios; bias voltages; circular state; crosspolar levels; detune; diode bias; fine adjustment; independently biased varactor diodes; left hand circular polarisation; linear polarisation; linear state; microstrip patch antenna; orthogonal modes; passive polarisation-agile patch antenna; patch axes; right hand circular polarisation; tune; varactor-diode loaded;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19940720
