Dielectric filter

Details Dielectric filter Dielectric filter

1987-09-03

1989-01-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333203, 333206, 333222, H01P 1205, H01P 704

Patent

active

048003476

ABSTRACT:
A dielectric filter includes a single block made of dielectric material having three or more through holes, in each of which an inner conductor is deposited, to define three or more dielectric resonators coupled in a cascade manner. Coupling holes are each formed between a pair of neighboring dielectric resonators. A bypass circuit, having a reactance component, is provided for connecting between two or more coupling holes; or for connecting the through hole of the dielectric resonator and a coupling hole; or for connecting the input terminal and one or more through holes of the dielectric resonators or the coupling holes. By selecting the holes to be interconnected and the value of the reactance of the bypass circuit, it is possible to provide a filter having a frequency characteristic in a desired format, including at least one pole at a selected point in an attenuation region thereof, without any increase in the number of dielectric resonator stages of the dielectric filter.

REFERENCES:
patent: 4423396 (1983-12-01), Makimoto et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4523162 (1985-06-01), Johnson
patent: 4692726 (1987-09-01), Green et al.
Hagele--"Mikrowellenfilter mit Umwegkopplungen sur Erzeugung von Dampfungspolen," Frequenz, 24 (1970) 11; pp. 330-331.

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