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Tunable bandpass filters with constant absolute bandwidth

open access: closedProceedings of the 9th International Symposium on Antennas, Propagation and EM Theory, 2010
This paper presents the design of novel tunable bandpass filters with constant absolute bandwidth. A novel mixed electric and magnetic coupling scheme is utilized. Theoretical analysis indicates that it is able to achieve desired coupling coefficients between the proposed resonators at various frequencies so as to obtain constant absolute bandwidth ...
Hong-Lin Zhang   +2 more
exaly   +3 more sources

Corrugated Microstrip Coupled Lines for Constant Absolute Bandwidth Tunable Filters

open access: closedIEEE Transactions on Microwave Theory and Techniques, 2010
This paper presents corrugated coupled lines for miniaturized fixed and tunable microstrip bandpass filters. The novel approach uses microstrip corrugated coupled-line concept to synthesize a coupling coefficient, which maintains a nearly constant absolute bandwidth across the tuning range.
Gabriel M Rebeiz
exaly   +3 more sources

Varactor-tuned dual-band filter with constant absolute bandwidth

open access: closed2012 IEEE/MTT-S International Microwave Symposium Digest, 2012
This paper proposed a novel varactor-tuned dual-band filter with constant absolute bandwidth. It is composed of a pair of half-wavelength open-ended resonators and a pair of quarter-wavelength short-ended resonators. The resonators utilized two different methods to control the electric and magnetic coupling so as to achieve constant absolute bandwidth.
Taijun Liu   +2 more
exaly   +3 more sources

High-Selectivity Tunable Balanced Bandpass Filter With Constant Absolute Bandwidth

open access: closedIEEE Transactions on Circuits and Systems II: Express Briefs, 2017
This brief presents a new and effective approach for designing a high-selectivity tunable balanced bandpass filter (BPF) with constant absolute bandwidth (ABW). The filter is composed of two open-loop resonators with a pair of symmetrically loaded varactor diodes to obtain tunable responses.
Jian-Xin Chen
exaly   +3 more sources

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