Compact, Coupled Strip-line Broad-Band Bandpass Filters

A miniature broad-band bandpass filter with size less than lambda/8 times lambda/8 times h (lambda is wavelength at the midband frequency; h is substrate height, much smaller than lambda/8), employing broadside-coupled strip-line resonators is introduced. Such resonators can be used to design combli...

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Bibliographic Details
Main Authors: Yunchi Zhang, Zaki, K.A.
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Bandwidth
Broad-band bandpass filter
broadside-coupled strip-line
combline
Coupling circuits
Educational institutions
interdigital
LTCC
Matched filters
Mode matching methods
Optimization methods
Resonant frequency
Resonator filters
Strips
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Description
Summary:A miniature broad-band bandpass filter with size less than lambda/8 times lambda/8 times h (lambda is wavelength at the midband frequency; h is substrate height, much smaller than lambda/8), employing broadside-coupled strip-line resonators is introduced. Such resonators can be used to design combline and interdigital filters of very wide relative bandwidth. The synthesis procedure follows the classical coupling matrix approach, which generates very good initial responses. Optimization by mode matching method (MMM) and fine-tuning in HFSS are combined to improve the filter performance. Two design examples are given to illustrate the design procedures and a 45% bandwidth interdigital filter in LTCC is being built for testing
ISSN:0149-645X
DOI:10.1109/MWSYM.2006.249404