Dielectric filter having a longitudinal through-hole and a transverse connection conductor

摘要

A dielectric filter includes: a dielectric block having a pair of opposing end faces; a through-hole formed between the pair of opposing end faces of the dielectric block; an inner conductor formed on the inner surface of the through-hole, the inner conductor being open-circuited at both its ends; an outer conductor formed on the outer surface of the dielectric block; and a connection conductor by which a central part of the inner conductor between its two opposing ends is connected to the outer conductor. Although the dielectric filter is composed of the single dielectric block, it behaves as a band-elimination filter having pass-bands around the elimination-band centered at a trap frequency wherein elimination occurs at both edges of the pass-bands.