Ceramic transverse-electromagnetic-mode filter having a waveguid

Details Ceramic transverse-electromagnetic-mode filter having a waveguid Ceramic transverse-electromagnetic-mode filter having a waveguid

1997-04-18

1998-12-15

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333134, H01P 1205, H01P 512

Patent

active

058501681

ABSTRACT:
A ceramic transverse-electromagnetic-mode filter having a waveguide cavity mode frequency shifting void and method of tuning same is provided. The ceramic filter includes a filter body (200) comprising a block of dielectric material and having top (202), bottom (204) and four side surfaces (206, 208, 210, 212) including vertical edges (214). The filter also has metallized through-holes providing transverse-electromagnetic-mode resonators (216). At least one vertical portion in proximity to the vertical edges (214) of the block on at least one of the side surfaces is unmetallized providing a waveguide cavity mode frequency shifting void (218). The waveguide cavity mode frequency shifting void (218) shifts a set of parasitic spurious responses in the filter frequency response curve to a lower frequency while simultaneously maintaining a desired transverse-electromagnetic-mode passband.

REFERENCES:
patent: 4431977 (1984-02-01), Sokola et al.
patent: 5150089 (1992-09-01), Komazaki et al.
patent: 5349315 (1994-09-01), Ala-Kojola
patent: 5416454 (1995-05-01), McVeety
patent: 5436602 (1995-07-01), McVeety et al.
patent: 5537085 (1996-07-01), McVeety

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