Dielectric filter having at least one stepped resonator hole wit

Details Dielectric filter having at least one stepped resonator hole wit Dielectric filter having at least one stepped resonator hole wit

1998-03-03

2000-07-11

Pascal, Robert

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333206, H01P 120, H01P 1202, H01P 1213

Patent

active

060879092

ABSTRACT:
A dielectric filter and a dielectric duplexer having a dielectric block with resonator holes formed therein, each having a large-sectional-area portion and a small-sectional-area portion so that the resonator hole has different respective inner diameters at an open-circuited end and a short-circuited end. Each large-sectional-area portion is formed with the cross-sectional shape of an elongated circle, an ellipse, or a rectangle, for example, the cross-sectional shape defining a longitudinal axis which is disposed at an angle against with respect to a plane in which the resonator holes are arranged. The invention increases the degree of freedom in providing a desired resonant frequency and a desired degree of coupling between resonators, in order to be able to easily provide desired filter characteristics, even in a case in which the external dimensions of the required dielectric block are restricted. Also disclosed is a method of manufacturing the dielectric filter and dielectric duplexer, as well as a radio transceiver utilizing the dielectric duplexer.

REFERENCES:
patent: 5124676 (1992-06-01), Ueno
patent: 5488335 (1996-01-01), Agahi-Kesheh et al.
patent: 5612654 (1997-03-01), Tsujiguchi et al.
patent: 5712648 (1998-01-01), Tsujiguchi
patent: 5742214 (1998-04-01), Toda et al.
patent: 5994981 (1999-11-01), Toda et al.
European Search Report dated Jun. 16, 1998.

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