Patent ID: 6150905
Filing Date: 2000-11-21
Classification: H01P

Abstract:
A dielectric filter, comprising:a dielectric block having a first surface and a second surface being opposite to said first surface;a plurality of dielectric resonators having through-holes which pass through from said first surface to said second surface and internal conductors which cover the internal surfaces of said through-holes; andan external conductor which covers the external surface of said dielectric block except for said first surface,wherein at least one of said through-holes has a large-diameter hole portion, a small-diameter hole portion which communicates with said large-diameter hole portion, and a shoulder portion which forms a transition between said large- and small-diameter hole portions; andwherein said at least one of said through-holes further comprises a coupling adjustment hole portion which communicates with said large- and small-diameter hole portions and can be adjusted in size for making a fine adjustment of electromagnetic coupling between adjacent said dielectric resonators, disposed at the side adjacent to said first surface of said dielectric block, and having a different diameter from those of said large-diameter hole portion and said small-diameter hole portion.