Multi-stage monolithic ceramic bandstop filter with isolated fil

Details Multi-stage monolithic ceramic bandstop filter with isolated fil Multi-stage monolithic ceramic bandstop filter with isolated fil

1991-07-22

1993-04-13

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, H01P 1205

Patent

active

052026540

ABSTRACT:
A multi-stage ceramic bandstop filter electrically isolates coupling between stages in a monolithic block of ceramic material (21) by including holes (32 and 36) between the resonator stages (30, 34, and 38) that are shorted at both the top and the bottom ends, that are coated with conductive material and that behave as electrical shields between the succeeding resonator stages electrically isolating and reducing signal coupling between stages. Isolation between stages is also provided by impedance inverting lengths of transmission line (50 and 52) that coupled the stages together.

REFERENCES:
patent: 4673902 (1987-06-01), Takeda et al.
patent: 4742562 (1988-05-01), Kommrusch
patent: 4823098 (1989-04-01), DeMuro et al.

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