Tunable Bandstop Filter with Bandwidth Compensation

Authors

  • Qianyin Xiang School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  • Quanyuan Feng School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  • Xiaoguo Huang School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  • Dinghong Jia School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China

Keywords:

Electric coupling, tunable bandstop filter

Abstract

In this paper, a tunable bandstop filter with bandwidth compensation is proposed. The equivalent circuit model of the tunable capacitor network is presented to study the tunable mechanism. The electric coupling factor of the tunable capacitor network increases while the tunable capacitor increases. This mechanism can be used to compensate the bandwidth of the tunable filter. In our work, semiconductor varactor diode loaded microstrip LC resonator is adopted to design a tunable bandstop filter. Each resonator requires only one varactor diode for both central frequency and resonator coupling coefficient control. The Sparameters and group delays of the tunable bandstop filter are presented. The measurement shows that the -30 dB absolute bandwidth varies from 371 MHz to 305 MHz, while the central frequency of the stopband varyies from 3.195 GHz to 2.285 GHz.

Downloads

Download data is not yet available.

References

M. Ojaroudi, N. Ojaroudi, and N. Ghadimi, “UWB slot antenna with band-stop operation by using H-shaped parasitic structures for UWB applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 12, pp. 1259, 2013.

Y. Ma, W. Che, W. Feng, and J. X. Cheng, “Square dual-mode quasi-elliptic bandpass filter with wide upper stopband,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 11, pp. 1056, 2013.

Q. Xiang, Q. Feng, and X. Huang, “Tunable bandstop filter based on split ring resonators loaded coplanar waveguide,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 7, pp. 591-596, 2013.

Z. H. Bao, Q. Y. Lu, C. Shao, J. X. Chen, and S. Zhang, “Novel bandwidth-agile bandpass filter using defected ground structure,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 28, no. 11, pp. 1050, 2013.

G. Mumcu, A. Dey, and T. Palomo, “Frequencyagile bandpass filters using liquid metal tunable broadside coupled split ring resonators,” IEEE Microw. Wireless Compon. Lett., vol. 23, no. 4, pp. 187-189, Apr. 2013.

D. Bouyge, D. Mardivirin, J. Bonache, A. Crunteanu, A. Pothier, M. Durán-Sindreu, P. Blondy, and F. Martín, “Split ring resonators (SRRs) based on micro-electro-mechanical deflectable cantilever-type rings: application to tunable stopband filters,” IEEE Microw. Wireless Compon. Lett., vol. 21, no. 5, pp. 243-245, May 2011.

K. C. Hwang and H. J. Eom, “Tunable notch filter of ferrite-filled grooves in parallel plates,” IEEE Microw. Wireless Compon. Lett., vol. 15, no. 5, pp. 363-365, May 2005.

H. S. Lee, D.-H. Choi, and J.-B. Yoon, “MEMSbased tunable LC bandstop filter with an ultrawide continuous tuning range,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 11, pp. 710- 712, Nov. 2009.

Q. Y. Xiang, Q.Y. Feng, and X.G. Huang, “A novel microstrip bandstop filter and its application to reconfigurable filter,” Journal Electromag. Waves Applica., vol. 26, no. 8-9, pp. 1039-1047, June. 2012.

Q. Y. Xiang, Q. Y. Feng, X. G. Huang, and D. H. Jia, “Electrical tunable microstrip LC bandpass filters with constant bandwidth,” IEEE Trans. Microw. Theory Tech., vol. 61, no. 3, pp. 1124- 1130, Mar. 2013.

X. Huang, Q. Feng, and Q. Xiang, “Bandpass filter with tunable bandwidth using quadruplemode stub-loaded resonator,” IEEE Microw. Wireless Compon. Lett., vol. 22, no. 4, pp. 176- 178, Apr. 2012.

X. Huang, L. Zhu, Q. Feng, Q. Xiang, and D. Jia, “Tunable bandpass filter with independently controllable dual passbands,” IEEE Trans. Microw. Theory and Tech., vol. 61, no. 9, pp. 3200-3208, Sept. 2013.

J. R. Mao, W. W. Choi, K. W. Tam, W. Q. Che, and Q. Xue, “Tunable bandpass filter design based on external quality factor tuning and multiple mode resonators for wideband applications,” IEEE Trans. Microw. Theory and Tech., vol. 61, no. 7, pp. 2574-2584, 2013.

X. Y. Zhang, Q. Xue, C. H. Chan, and B. J. Hu, “Low-loss frequency-agile bandpass filters with controllable bandwidth and suppressed second harmonic,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 6, pp. 1557-1564, Jun. 2010.

A. I. Abunjaileh and I. C. Hunter, “Tunable bandpass and bandstop filters based on dual-band combline structures,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 12, pp. 3710-3719, Dec. 2010.

X. Y. Zhang, C. H. Chan, Q. Xue, and B. J. Hu, “RF tunable bandstop filters with constant bandwidth based on a doublet configuration,” IEEE Trans. Ind. Electron., vol. 59, no. 2, pp. 1257-1265, Feb. 2012.

R. J. Cameron, “Advanced coupling matrix synthesis techniques for microwave filters,” IEEE Trans. Microw. Theory Tech., vol. 51, no. 1, pp. 1-10, 2003.

J.-S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York: Wiley, 2001.

Downloads

Published

2021-08-22

How to Cite

[1]
Q. . Xiang, Q. . Feng, X. . Huang, and D. . Jia, “Tunable Bandstop Filter with Bandwidth Compensation”, ACES Journal, vol. 30, no. 08, pp. 903–908, Aug. 2021.

Issue

2015: Vol 30 Iss 8

Section

General Submission