Title :
Tunable bandstop filters using BST varactor chips
Author :
Chun, Young-Hoon ; Hong, Jia-Sheng ; Bao, Peng ; Jackson, Timothy J. ; Lancaster, Michael J.
Author_Institution :
Heriot-Watt Univ. Riccarton, Edinburgh
Abstract :
Ferroelectric Barium-Strontium-Titanate (BST) film varactor chips are fabricated and applied to the design of electronically tunable bandstop filters (BSFs) based on stepped impedance line resonator (SIR). Three different types of filters are designed and three different BST varactor chips are used to investigate the properties of BST varactors at microwave frequencies. The designed tunable BSFs show more than 30 dB of band rejection at the center frequency of 1.1 GHz with 10 % of frequency tuning ranges.
Keywords :
band-stop filters; barium compounds; ferroelectric materials; microstrip resonators; tuning; varactors; BST varactor chips; band rejection; electronically tunable bandstop filters; ferroelectric barium-strontium-titanate film varactor chips; frequency tuning ranges; microwave frequency; stepped impedance line resonator; Binary search trees; Circuit optimization; Fabrication; Ferroelectric materials; Frequency; Microwave circuits; Microwave filters; Tunable circuits and devices; Tuning; Varactors;
Conference_Titel :
Microwave Conference, 2007. European
Conference_Location :
Munich
Print_ISBN :
978-2-87487-001-9
DOI :
10.1109/EUMC.2007.4405138
