Interdigital ceramic filter with transmission zero

Details Interdigital ceramic filter with transmission zero Interdigital ceramic filter with transmission zero

1995-03-31

1996-07-16

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333207, H01P 1205

Patent

active

055370853

ABSTRACT:
A ceramic filter (10) is shown. The filter has a filter body of dielectric material, has top (14), bottom (16), and side surfaces (18, 20, 22 and 24), and further has metallized through holes extending from the top (14) to the bottom surface (16) defining resonators. A metallization layer substantially coats the top (14), bottom (16), and side surfaces (18, 20, 22 and 24), with the exception that a portion of one of the side surfaces is unmetallized in proximity to the bottom surface (16) and extends laterally between the resonators, defining a magnetic transmission line (32) for magnetically coupling alternate resonators. Also unmetallized are predetermined portions of the top and bottom surfaces which are alternately unmetallized, defining an interdigital configuration. Input-output couplings (34, 38) are included for coupling signals into and out of the filter. With this configuration, a desired frequency response can be obtained.

REFERENCES:
patent: 5150089 (1992-09-01), Komazaki et al.
patent: 5208565 (1993-04-01), Sogo et al.
patent: 5436602 (1995-07-01), McVeety et al.

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