Title :
A 6.2–7.5 GHz tunable bandpass filter with integrated Barium Strontium Titanate (BST) interdigitated varactors utilizing silver/copper metallization
Author :
Feng, Zhiping ; Fathelbab, Wael M. ; Lam, Peter G. ; Haridasan, Vrinda ; Maria, Jon-Paul ; Kingon, Angus I. ; Steer, Michael B.
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC
Abstract :
A 3rd-order combline tunable filter is implemented utilizing ferroelectric barium strontium titanate (BST) interdigitated varactors. The filter and its varactors are integrated on a ceramic substrate using a simple resistive biasing circuit. Upon the application of a bias voltage ranging from 0 to 40 V the passband of the filter tuned from 6.2 to 7.5 GHz while maintaining a fractional bandwidth of approximately 13.8 %. Over the tuning band the passband insertion loss varied from 8.5 dB to 6.3 dB while the return loss was better than 10 dB.
Keywords :
band-pass filters; barium compounds; circuit tuning; comb filters; copper; ferroelectric devices; ferroelectric materials; integrated circuit metallisation; losses; radiofrequency filters; radiofrequency integrated circuits; silver; strontium compounds; varactors; Ba0.6Sr0.4TiO3-Ag-Cu; ceramic substrate; combline tunable filter; ferroelectric barium strontium titanate; frequency 6.2 GHz to 7.5 GHz; integrated BST interdigitated varactors; loss 8.5 dB to 6.3 dB; passband insertion loss; resistive biasing circuit; return loss; silver-copper metallization; tunable bandpass filter; voltage 0 V to 40 V; Band pass filters; Barium; Binary search trees; Copper; Metallization; Silver; Strontium; Titanium compounds; Tunable circuits and devices; Varactors; Barium Strontium Titanate; ferroelectrics; interdigitated capacitors; tunable combline filter;
Conference_Titel :
Radio and Wireless Symposium, 2009. RWS '09. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2698-0
Electronic_ISBN :
978-1-4244-2699-7
DOI :
10.1109/RWS.2009.4957432
