Coaxial resonator and dielectric filter using the same

A dielectric filter in which a plurality of coaxial resonators are provided side by side, wherein each of said coaxial resonators comprises:

• a respective dielectric block having at least four corresponding side surfaces, each of said at least four side surfaces having a respective outer peripheral surface and said respective dielectric block having a corresponding inner peripheral surface, each said respective outer peripheral surface and said respective inner peripheral surface being parallel to each other along a corresponding common axis, and said respective dielectric block further having first and second end faces crossing said corresponding axis;
• first and second layers of a conductor coating respectively disposed on said corresponding outer peripheral surface and said corresponding inner peripheral surface;
• a third conductor layer disposed on said respective second end face for short-circuiting said corresponding first and second conductor layers;
• a conductor for induction, having a portion parallel to the second conductor layer, disposed on at least one of said outer peripheral surfaces in a position in proximity to said second end face, and is brought into direct electrical contact with only said respective third conductor layer and is provided independently of said corresponding first conductor layer;
• and
• reactance means for positioning all or a part of said respective conductors for induction in said corresponding coaxial resonators in a common plane, thereby arranging the first end faces and the second end faces in said respective coaxial resonators in a similar direction along said common plane and connecting the respective conductors for induction in the adjacent coaxial resonators to each other.