K-band quasi-planar tapped combline filter and diplexer

Quasi-planar realizations of a combline bandpass filter and diplexer using multiple coupled suspended substrate striplines (MCSSSs) have demonstrated good performance at K-band without any tuning. The N MCSSSs excite N zero-cutoff-frequency quasi-TEM modes. A computer-aided filter design approach em...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1993-02, Vol.41 (2), p.215-223
Main Authors: Wen-Teng Lo, Tzuang, C.-K.C.
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bars
Circuit optimization
Circuit properties
Coupling circuits
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fasteners
Frequency
K-band
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave filters
Resonator filters
Stripline
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Summary:Quasi-planar realizations of a combline bandpass filter and diplexer using multiple coupled suspended substrate striplines (MCSSSs) have demonstrated good performance at K-band without any tuning. The N MCSSSs excite N zero-cutoff-frequency quasi-TEM modes. A computer-aided filter design approach employing a rigorous spectral domain approach and 2N-port microwave circuit theory accounts for the effects of the N quasi-TEM modes, the couplings through nonadjacent MCSSSs, and cover height. Two 19.5-20.5 GHz MCSSS combline filters with different cover heights have been built and tested to compare their filter characteristics. The reduction in cover height has been found to decrease the amount of nonadjacent coupling through MCSSSs and to result in better filter stopband performance. An 18.5-19 GHz and 20-20.5 GHz MCSSS diplexer is also presented. All the measured results for the combline filters and diplexers agree well with the theoretic calculations.< >
ISSN:0018-9480
1557-9670
DOI:10.1109/22.216459