Patent ID: 6483405
Filing Date: 2002-11-19
Classification: H01P

Abstract:
A dielectric filter, comprising:a dielectric block having a generally rectangular parallelepiped shape; a plurality of through holes provided in the dielectric block, extending from a first end face thereof and reaching a second end face thereof opposite to the first end face; internal conductors provided within the through holes; and a conductor provided on the external surface of the dielectric block, with the first end face of the dielectric block serving as an open circuit face and the second end face of the dielectric block serving as a short circuit face; thereby forming a plurality of dielectric resonators; wherein cross sections of the holes are rectangular, each hole of the plurality of holes has a large-size portion and a small-size portion which are connected to each other at a step portion, and the large-size portions are of the same length and are arranged at the first end face and the small-size portions are arranged at the second end face; the step portion being disposed at a depth which is greater than 25% and less than 50% of the hole length extending from the first end face to the second end face.