Dielectric filter, dielectric duplexer, and communication...

Details Dielectric filter, dielectric duplexer, and communication... Dielectric filter, dielectric duplexer, and communication...

2005-02-08

2005-02-08

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S202000, C333S206000

Reexamination Certificate

active

06853266

ABSTRACT:
Resonator holes are provided so as to extend between opposing surfaces of a dielectric filter. At least one of the resonator holes have large-diameter hole portions, and small-diameter hole portions communicating with the large-diameter hole portions, respectively. The small-diameter hole portions are provided in one of the opposing surfaces. The axes of the small-diameter hole portions and the axes of the large-diameter hole portions are displaced, respectively, such that the displacement distance P therebetween is within a range which satisfies the relationship R−r<P<R+r, where R is the radii of the large-diameter hole portions and r is the radii of the small-diameter hole portions. The large-diameter hole portions and the small-diameter hole portions overlap each other in the axial directions of the resonator holes.

REFERENCES:
patent: 5945896 (1999-08-01), Miyamoto
patent: 6433651 (2002-08-01), Kuroda et al.
patent: 6580339 (2003-06-01), Kuroda

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