Abstract
This paper presents tunable balanced bandpass filters with constant fractional bandwidth (FBW) and constant absolute bandwidth (ABW), respectively. The equivalent differential- and common-mode circuits of the proposed filters are analyzed. The differential-mode bandwidths can be maintained constant when the frequency is tuned by selecting proper coupling regions and controlling the external quality factor Qe. To suppress the common-mode response, different elements are loaded in the middle of the resonators to misalign common-mode resonant frequencies. The common-mode response can be suppressed without degrading the differential-mode performance. For demonstration, two tunable balanced filters with constant FBW and ABW are implemented, respectively. Comparisons of the calculated, simulated, and measured results are presented to verify the theoretical predications.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Microwave Theory and Techniques
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
