Dielectric filter, duplexer, and communication system

Details Dielectric filter, duplexer, and communication system Dielectric filter, duplexer, and communication system

1998-08-28

2000-07-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333134, 333207, H01P 1205

Patent

active

060879114

ABSTRACT:
The invention provides a dielectric filter, comprising: a dielectric block having a first end surface and a second end surface opposite to said first end surface; a plurality of resonator holes passing through from said first end surface to said second end surface of said dielectric block; an inner conductor provided on an inner surface of said resonator holes; and an outer conductor provided on an outside surface of said dielectric block; wherein said first end surface of said dielectric block constitutes a short-circuit end surface; said short-circuit end surface includes an inside portion including ends of said resonator holes adjacent to each other and an outside portion provided around said inside portion; said inside portion is electrically separated from said outside portion by a non-conducting portion substantially encircling said inside portion; and said inside portion is connected to said outside portion by a microinductance generating means.
According to this dielectric filter, it is possible to easily adjust the coupling between adjacent dielectric resonators without altering the configuration and dimensions of a dielectric block.

REFERENCES:
patent: 4464640 (1984-08-01), Nishikawa et al.
patent: 5602518 (1997-02-01), Clifford, Jr. et al.
patent: 5844454 (1998-12-01), Ono et al.

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