Title :
Tunable 3.5GHz and 1.5GHz chip antennas based on thin-film BaSrTiO3 capacitors
Author :
Ni, Nan ; Cardona, Albert Humirang
Author_Institution :
Agile RF, Inc., Santa Barbara, CA, USA
Abstract :
Tunable 3.5GHz and 1.5GHz chip antennas are presented in this paper. By applying tunable matching networks, the chip antennas show tunable characteristic. Especially, the capacitors in the matching networks are tunable thin-film BST capacitors, which have a 3:1 tuning ratio. The capacitance of the BST capacitors can be tuned by an external DC bias voltage. By varying the capacitance, the tunable matching networks increased the bandwidth of the 3.5GHz antenna by 80%, and the 1.5GHz antenna by 26%.
Keywords :
UHF antennas; barium compounds; circuit tuning; microwave antennas; strontium compounds; thin film capacitors; BaSrTiO3; bandwidth 1.5 GHz; bandwidth 3.5 GHz; external DC bias voltage; thin-film BST capacitors; tunable chip antennas; tunable matching networks; Bandwidth; Broadband antennas; Capacitance; Capacitors; Tuning; BST; Chip antennas; tunable circuits and devices;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2011 IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
978-1-4244-7687-9
DOI :
10.1109/RWS.2011.5725454
