A fully tunable C-band reflectionless bandstop filter using L-resonators

This paper presents a fully tunable reflectionless bandstop filter using multi-section L-Resonators. The bandstop filter is designed to operate in the C-Band, tunable from 3.96–4.4 GHz with greater than 20 dB of in-band rejection and a return loss of better than 8 dB across the full tuning range. Simulation and measurement results are presented.

[1]  Yo-Shen Lin,et al.  Narrowband Coupled-Line Bandstop Filter With Absorptive Stopband , 2015, IEEE Transactions on Microwave Theory and Techniques.

[2]  D. Jachowski,et al.  Passive enhancement of resonator Q in microwave notch filters , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[3]  Dimitrios Peroulis,et al.  Octave tunable lumped-element notch filter with resonator-Q-independent zero reflection coefficient , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[4]  Douglas R. Jachowski,et al.  Tunable lumped-element notch filter with constant bandwidth , 2010, 2010 IEEE International Conference on Wireless Information Technology and Systems.

[5]  E. M. Jones,et al.  Microwave Filters, Impedance-Matching Networks, and Coupling Structures , 1980 .

[6]  H. C. Bell.  L-resonator bandstop filters , 1996 .

[7]  G. L. Matthaei,et al.  DESIGN OF MICROWAVE FILTERS, IMPEDANCE-MATCHING NETWORKS, AND COUPLING STRUCTURES. VOLUME 2 , 1963 .

[8]  A.C. Guyette,et al.  Perfectly-matched bandstop filters using lossy resonators , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[9]  Jia-Sheng Hong,et al.  Microstrip filters for RF/microwave applications , 2001 .

[10]  Yo-Shen Lin,et al.  Millimeter-wave bandstop filter with absorptive stopband , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[11]  Roberto Gomez-Garcia,et al.  Bio-Inspired Hybrid Filter Bank for Software-Defined Radio Receivers , 2013, IEEE Transactions on Microwave Theory and Techniques.

[12]  D.R. Jachowski,et al.  Compact, frequency-agile, absorptive bandstop filters , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[13]  Gabriel M. Rebeiz,et al.  Lumped-Element Fully Tunable Bandstop Filters for Cognitive Radio Applications , 2011, IEEE Transactions on Microwave Theory and Techniques.

[14]  M A Morgan,et al.  Theoretical and Experimental Study of a New Class of Reflectionless Filter , 2011, IEEE Transactions on Microwave Theory and Techniques.