Miniature broadband bandpass filters using double-layer coupled stripline resonators

A novel double-layer coupled stripline resonator structure is introduced to realize miniature broadband bandpass filters. Filters with relative bandwidth up to 60% and size less than lambda/8timeslambda/8timesh (lambda is wavelength at the midband frequency; h is the substrate height, which is much...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-08, Vol.54 (8), p.3370-3377
Main Authors: Yunchi Zhang, Zaki, K.A., Piloto, A.J., Tallo, J.
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bandpass filter
Bandpass filters
Bandwidth
Broadband
Ceramics
Circuit properties
combline
compact
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Frequency filters
interdigital
low-temperature co-fired ceramic (LTCC)
Manufacturing
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Miniature
Mode matching methods
Optimization methods
Oscillators, resonators, synthetizers
resonator
Resonator filters
Resonators
Stripline
Striplines
Transmission line matrix methods
Tuning
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Summary:A novel double-layer coupled stripline resonator structure is introduced to realize miniature broadband bandpass filters. Filters with relative bandwidth up to 60% and size less than lambda/8timeslambda/8timesh (lambda is wavelength at the midband frequency; h is the substrate height, which is much smaller than lambda/8) can be fulfilled using such resonators. Two possible filter configurations are proposed in this paper: combline and interdigital. The filter synthesis procedure follows the classical coupling matrix approach that generates very good initial responses. Optimization by the mode-matching method and fine tuning in Ansoft's High Frequency Structure Simulator are combined to improve the filter performance. Two filter design examples are given to validate the feasibility. Low temperature co-fired ceramic (LTCC) technology is employed to manufacture the filters. Experimental results of the two manufactured filters are presented. The effects of LTCC manufacturing procedure on the filter performance are also discussed
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.879176