Ceramic filter with a transmission zero

Details Ceramic filter with a transmission zero Ceramic filter with a transmission zero

1994-04-28

1995-07-25

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333207, H01P 1205

Patent

active

054366020

ABSTRACT:
A ceramic filter with a high side transmission zero. The ceramic filter (10) has: a filter body (12) of a dielectric material having top, bottom and side surfaces (14, 16, 18, 20, 22, 24). Two through-holes extending from the top (14) to the bottom surface (16), defining resonators (26,28) are included. The surfaces are substantially covered with a conductive material, defining a metallized layer (30), with the exception that the top surface (14) is substantially uncoated and with the additional exception that a portion of the side surface is also uncoated (32) in proximity to the bottom surface (16), and it extends laterally at least in proximity to the resonators (26,28), defining a magnetic transmission line (32) for magnetically coupling the resonators (26,28). Surface mountable first and second input-output pads (34,38) are also provided.

REFERENCES:
patent: 4523162 (1985-06-01), Johnson
patent: 5146193 (1992-09-01), Sokola
patent: 5218329 (1993-06-01), Vangala et al.
patent: 5307036 (1994-04-01), Turunen et al.
patent: 5321374 (1994-06-01), Uwano

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