Hostname: page-component-7c8c6479df-995ml Total loading time: 0 Render date: 2024-03-19T08:27:44.709Z Has data issue: false hasContentIssue false

A Tunable Bandstop Filter Using Thin Film Barium-Strontium-Titanate Varactors

Published online by Cambridge University Press:  28 July 2014

S. Alzahrani
Affiliation:
Microelectronics Laboratory, Department of Electrical and Computer Engineering, University of Colorado, Colorado Springs, CO 80918
T.S Kalkur
Affiliation:
Microelectronics Laboratory, Department of Electrical and Computer Engineering, University of Colorado, Colorado Springs, CO 80918
Get access

Abstract

Ferroelectric barium-strontium-titanate (BST) varactors are becoming extremely important particularly for frequency-agile RF and microwave circuits. Tunable bandstop filters are desired to eliminate unwanted signals for several communication systems. In this paper, a compact tunable bandstop filter (BSF) based on a single hairpin resonator, using ferroelectric BST varactors, is also presented. The frequency response of proposed BSF can be adjusted by increasing or decreasing the length, width, and space for the coupled line hairpin resonator. One pair of variable capacitors has been incorporated to the filter for tuning and miniaturization purposes. The notch frequency of BSF can be tuned from 705 MHz to 1.035 GHz with a tuning voltage of 6 Volts utilizing BST varactors.

Type
Articles
Copyright
Copyright © Materials Research Society 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

. Yalin, Ma; Che, Wenquan; Mao, Jinrong; Chen, Jianxin, “Novel tunable bandstop filter using end-loaded quarter-wavelength resonators,” Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on, vol. 5, no., pp.1,4, 5–8 May 2012.Google Scholar
Yan, W.D.; Mansour, R.R., “Compact Tunable Bandstop Filter Integrated with Large Deflected Actuators,” Microwave Symposium, 2007. IEEE/MTT-S International, vol., no., pp.1611, 1614, 3–8 June 2007.Google Scholar
Latip, M.A.A.; Wahab, N.A.; Salleh, M. K M; Awang, Z.; Hamzah, M.K., “Frequency-tuned microwave ring resonator using varactor diodes,” Electronic Devices, Systems and Applications (ICEDSA), 2011 International Conference on, vol., no., pp.195,198, 25–27 April 2011.Google Scholar
Chun, Y.-H.; Hong, J.-S.; Bao, P.; Jackson, T.J.; Lancaster, M.J., “Tunable slotted ground structured bandstop filter with BST varactors,” Microwaves, Antennas & Propagation, IET, vol. 3, no.5, pp.870,876, August 2009.CrossRefGoogle Scholar
Kabir, A.; Jamil, A.; Yulan, Zhang; Kalkur, T.S., “Voltage controlled oscillators with ferroelectric capacitors,” Frequency Control Symposium, 2008 IEEE International, vol., no., pp.414,417, 19–21 May 2008.CrossRefGoogle Scholar
Wei, F.; Chen, L.; Shi, X.-W.; Huang, Q.-L.; Wang, X.-H., “Compact lowpass filter with wide stop-band using coupled-line hairpin unit,” Electronics Letters, vol. 46, no.1, pp.88,90, January 7 2010.CrossRefGoogle Scholar