초록 ▼

A ceramic transverse-electromagnetic-mode filter having a resistive paste base and resistive paste layer 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, 20

A ceramic transverse-electromagnetic-mode filter having a resistive paste base and resistive paste layer 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 (210). 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 resistive paste base (218). A resistive paste layer (219) of predetermined resistivity is deposited thereon. The resistive paste layer attenuates a set of parasitic spurious responses in the filter frequency response curve while simultaneously maintaining a desired transverse-electromagnetic-mode passband.

대표청구항 ▼

[ What is claimed is:] [1.] A ceramic filter, comprising:a filter body comprising a block of dielectric material and having top, bottom and four side surfaces including vertical edges, and having a plurality of metallized through-holes extending from the top to the bottom surfaces defining transvers

[ What is claimed is:] [1.] A ceramic filter, comprising:a filter body comprising a block of dielectric material and having top, bottom and four side surfaces including vertical edges, and having a plurality of metallized through-holes extending from the top to the bottom surfaces defining transverse-electromagnetic-mode resonators, the surfaces being substantially covered with a conductive material defining a metallized layer, with the exception that the top surface is substantially uncoated, and with an additional exception that at least one vertical portion in proximity to the vertical edges of the block on at least one of the side surfaces is unmetallized defining an unmetallized base;the unmetallized base extending substantially vertically in proximity to the vertical edges of the block starting at a top edge of the block and extending a distance downwardly so as to attenuate a set of parasitic harmonic spurious passband responses in the filter frequency response curve while simultaneously maintaining a desired transverse-electromagnetic-mode passband;a layer of resistive paste of predetermined resistivity deposited immediately on top of the unmetallized base; andfirst and second input-output pads comprising an area of conductive material on at least one of the side surfaces and substantially surrounded by an uncoated area of the dielectric material.