Design of Dual- and Triple-Passband Filters Using Alternately Cascaded Multiband Resonators Alternately Cascaded Multiband Resonators
Journal
IEEE Transactions on Microwave Theory and Techniques
Journal Volume
54
Journal Issue
9
Pages
3550-3558
Date Issued
2006
Author(s)
Abstract
A novel method for designing multiband bandpass filters has been proposed in this paper. Coupling structures with both Chebyshev and quasi-elliptic frequency responses are presented to achieve dual- and triple-band characteristics without a significant increase in circuit size. The design concept is to add some extra coupled resonator sections in a single-circuit filter to increase the degrees of freedom in extracting coupling coefficients of a multi-band filter and, therefore, the filter is capable of realizing the specifications of coupling coefficients at all passbands. To verify the presented concept, four experimental examples of filters with a dual-band Chebyshev, triple-band Chebyshev, dual-band quasi-elliptic, and triple-band quasi-elliptic response have been designed and fabricated with microstrip technology. The measured results are in good agreement with the full-wave simulation results. © 2006 IEEE.
Subjects
Coupling coefficient; External quality factor; Microstrip filter; Stepped-impedance resonator; Transmission zero
SDGs
Other Subjects
Coupling coefficients; External quality factors; Microstrip filters; Stepped-impedance resonator; Transmission zero; Computer simulation; Coupled circuits; Microstrip devices; Natural frequencies; Optical resonators; Waveguide couplers; Bandpass filters
Type
journal article
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