Compact microstrip bandpass filters using triple‐mode resonator with lumped elements

Compact microstrip bandpass filters using triple‐mode resonator are investigated in this paper. At the center frequency of 2.45 GHz, a half‐wavelength microstrip open‐circuited resonator is loaded with a chip capacitor and a chip inductor to realize the triple‐mode resonator. By adjusting the resona...

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Bibliographic Details
Published in:Microwave and optical technology letters 2021-05, Vol.63 (5), p.1354-1359
Main Authors: Chang, Wei‐Chung, Tu, Wen‐Hua
Format: Article
Language:English
Subjects:
Bandpass filters
microstrip bandpass filters
Resonators
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Summary:Compact microstrip bandpass filters using triple‐mode resonator are investigated in this paper. At the center frequency of 2.45 GHz, a half‐wavelength microstrip open‐circuited resonator is loaded with a chip capacitor and a chip inductor to realize the triple‐mode resonator. By adjusting the resonator's parameters, the first three resonant mode frequencies could be tuned for bandpass filters with various fractional bandwidths. Three bandpass filters with different measured bandwidths (13.8%, 55.5%, 98.6%) are designed, fabricated, and tested to validate the design concept.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.32749