Dielectric filter

Details Dielectric filter Dielectric filter

1988-12-08

1990-03-06

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333223, H01P 1202

Patent

active

049069551

ABSTRACT:
A dielectric filter includes a plurality of coaxial resonators constituted by inner conductors formed on inner walls of a plurality of throughholes which are formed in parallel with each other on a dielectric block and an outer conductor which is formed on an outer surface of the dielectric block. A printed circuit board is disposed at a side of an open end of the dielectric block, and the printed circuit board and the dielectric block are accommodated in a metallic case which is electrically connected to the outer conductor. A projecting portion is formed on an inner surface of the metallic case to support the printed circuit board such that a predetermined gap can be formed between the printed circuit board and a bottom surface of the metallic case by the projecting portion, whereby a stray capacity is reduced. Therefore, it is possible to prevent resonant frequencies of the coaxial resonators from being changed or fluctuated, and thus a filter characteristic of the dielectric filter becomes good.

REFERENCES:
patent: 4342972 (1982-08-01), Nishikawa et al.
patent: 4686496 (1987-08-01), Syrett et al.

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