Multi-passband dielectric filter construction having a filter po

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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333202, 333207, H01P 120

Patent

active

054883350

ABSTRACT:
A filter duplexer, such as a filter duplexer for a radio transceiver, of minimum dimensions is disclosed. First and second filter portions of the duplexer each include a plurality of transmission lines. Cross sections of the plurality of transmission lines of each filter portion are of at least two different geometries. The amount of coupling between adjacent ones of the resonators, as well as the loading capacitances of such resonators, is controlled by the relative geometric configuration of the adjacent ones of the resonators. Because the amount of coupling between the resonators and the loading capacitances of the resonators is determinative of the filter characteristics of the filter duplexer, desired filter characteristics may be effectuated by careful selection of the geometric configurations of the resonators of each filter portion.

REFERENCES:
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patent: 4742562 (1988-05-01), Kommrusch
patent: 4879533 (1989-11-01), de Muro et al.
patent: 4954796 (1990-09-01), Green et al.
patent: 4965537 (1990-10-01), Kommrusch
patent: 5109536 (1992-04-01), Kommrusch
patent: 5250916 (1993-10-01), Zakman

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