Title :
Voltage-Controlled Ku-Band and X-Band Tunable Combline Filters Using Barium-Strontium-Titanate
Author :
Sigman, Jennifer ; Nordquist, Christopher D. ; Clem, Paul G. ; Kraus, Garth M. ; Finnegan, Patrick S.
Author_Institution :
Nat. Labs., Albuquerque, NM
Abstract :
Tunable X-band and Ku-band combline bandpass filters using barium-strontium-titanate capacitors fabricated on alumina substrates with through-substrate CuW vias are reported. Under a 0-100 V bias, the X-band filter changes center frequency from 8.75 GHz to 10.96 GHz with 4-8 dB of loss while the Ku-band filter changes center frequency from 11.7 GHz to 14.3 GHz with 6-10 dB of loss. Advances in processing and integration related to the filter fabrication and design are discussed.
Keywords :
active filters; alumina; band-pass filters; barium compounds; circuit tuning; comb filters; copper alloys; microwave filters; strontium compounds; thin film capacitors; tungsten alloys; voltage control; (BaSr)TiO3; Al2O3; BST capacitors; CuW; X-band tunable combline filters; alumina substrates; bandpass filters; frequency 11.7 GHz to 14.3 GHz; frequency 8.75 GHz to 10.96 GHz; loss 4 dB to 8 dB; loss 6 dB to 10 dB; voltage 0 V to 100 V; voltage-controlled Ku-band filter; Band pass filters; Binary search trees; Capacitance; Capacitors; Electrodes; Fabrication; Microwave filters; Temperature; Tunable circuits and devices; Voltage; Barium titanate; combline filters; strontium titanate; tunable dielectrics; tunable filters;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.2002453
