Title :
Design and application of a liquid crystal varactor based tunable coupled line for polarization agile antennas
Author :
Karabey, Onur Hamza ; Bausch, S. ; Bildik, Saygin ; Strunck, Sebastian ; Gaebler, Alexander ; Jakoby, Rolf
Author_Institution :
Inst. for Microwave Eng. & Photonics, Tech. Univ. Darmstadt, Darmstadt, Germany
fDate :
Oct. 31 2012-Nov. 2 2012
Abstract :
This paper presents design and application of a varactor loaded tunable coupled line for a polarization agile antenna. Based on the investigations, a method is proposed to reduce the required varactor tunability. Later on, the results are verified by prototyping an antenna, which consists of a liquid crystal based tunable coupled line. The antenna operates at 13.75 GHz with a return loss of better than 10dB. The measurement results confirm that the polarization state of the antenna can be changed continuously between linear and circular polarizations by applying a DC bias voltage to the varactors.
Keywords :
antennas; liquid crystal devices; polarisation; varactors; DC bias voltage; circular polarizations; frequency 13.75 GHz; linear polarizations; liquid crystal varactor based tunable coupled line; polarization agile antennas; polarization state; return loss; varactor loaded tunable coupled line; varactor tunability; Antenna measurements; Antennas; Capacitance; Polarization; Prototypes; Tuning; Varactors;
Conference_Titel :
Radar Conference (EuRAD), 2012 9th European
Conference_Location :
Amsterdam
Print_ISBN :
978-1-4673-2471-7
