Reconfigurable bandpass filter with center frequency and bandwidth control

This article presents a bandpass filter with independent center frequency and bandwidth control. It is based on four frequency-reconfigurable resonators arranged in a series cascade of a second-order bandpass filter and a dual-behavior resonator. A measured bandpass filter response with variable bandwidth between 440 and 0 MHz is demonstrated at 3.6 GHz. The center frequency of the filter can be continuously varied between 2.76 and 3.79 GHz (1.4:1) with continuous bandwidth variation between 300 and 100 MHz (3:1) for a minimum out-of-band isolation of −15 dB and insertion loss between 0.76 and 2.5 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2745–2750, 2013

[1]  J.I. Alonso,et al.  Tunable combline filter with continuous control of center frequency and bandwidth , 2005, IEEE Transactions on Microwave Theory and Techniques.

[2]  J. Papapolymerou,et al.  Electronic switchable bandpass filter using PIN diodes for wireless low cost system-on-a-package applications , 2004 .

[3]  Gabriel M. Rebeiz,et al.  A varactor-tuned RF filter , 2000 .

[4]  Gabriel M. Rebeiz,et al.  High-Performance 1.5–2.5-GHz RF-MEMS Tunable Filters for Wireless Applications , 2010, IEEE Transactions on Microwave Theory and Techniques.

[5]  H. Joshi,et al.  Substrate Integrated Evanescent-Mode Cavity Filter With a 3.5 to 1 Tuning Ratio , 2010, IEEE Microwave and Wireless Components Letters.

[6]  W.J. Chappell,et al.  High-$Q$ Fully Reconfigurable Tunable Bandpass Filters , 2009, IEEE Transactions on Microwave Theory and Techniques.

[7]  Gabriel M. Rebeiz,et al.  Low-Loss Two-Pole Tunable Filters With Three Different Predefined Bandwidth Characteristics , 2008, IEEE Transactions on Microwave Theory and Techniques.

[8]  G. Dionne,et al.  Compact tunable bandpass filter on YIG substrate , 2012 .

[9]  Wen-Hua Tu.  Compact Low-Loss Reconfigurable Bandpass Filter With Switchable Bandwidth , 2010, IEEE Microwave and Wireless Components Letters.

[10]  Jia-Sheng Hong,et al.  Reconfigurable cascaded coupled line filter with four distinct bandwidth states , 2011 .

[11]  I.C. Hunter,et al.  Electronically Reconfigurable Microwave Bandpass Filter , 2009, IEEE Transactions on Microwave Theory and Techniques.

[12]  Eric Rius,et al.  Narrow bandpass filters using dual-behavior resonators , 2003 .