Title :
BST varactor tuned bandstop filter with slotted ground structure
Author :
Chun, Young-Hoon ; Hong, Jia-Sheng ; Bao, Peng ; Jackson, Timothy J. ; Lancaster, Michael J.
Author_Institution :
Department of Electrical, Electronic and Computer Engineering, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK
Abstract :
This paper presents an investigation of tunable bandstop filter using slotted ground structure. A Barium-Strontium-Titanate (BST) varactor chip is used to tune each resonator and its location is determined by electromagnetic simulation for an optimum frequency tuning. 2-pole bandstop filter is measured at the center frequency from 1.2 to 1.4 GHz and its rejection is more than 15 dB at the stop band while the insertion loss at the pass band is less than 1 dB.
Keywords :
band-stop filters; barium compounds; resonators; slot lines; strontium compounds; titanium compounds; tuning; varactors; 2-pole bandstop filter; BST; barium-strontium-titanate varactor chip; electromagnetic simulation; frequency tuning; resonator tuning; slotted ground structure; varactor tuned bandstop filter; Band pass filters; Binary search trees; Electromagnetic measurements; Frequency measurement; Insertion loss; Loss measurement; Resonator filters; Semiconductor device measurement; Tuning; Varactors; BST; Tunable filter; bandstop filter; slotted ground; tunable circuit; varactor;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4633252
