PURPOSE: To provide the dielectric filter which can easily form an attenuation pole near a passing band concerning the frequency characteristics and can be miniaturized as well.
CONSTITUTION: Dielectric resonantors 10a and 10b constituted by forming through holes 4 at dielectric blocks 2, forming inner conductors 6 on the internal faces of these through holes and forming outer conductors 8 on the external faces of these dielectric blocks 2 are arranged. A conductive shield member 30 is arranged while connecting one part to the outer conductors of the dielectric resonantors 10a and 10b so as to cover a block 12 for coupling, and the head part of this shield member 30 is grounded through a capacitor formed by a conductor film pattern 26 and a conductor film 28 formed on both the sides of a wiring board 20. An element 24a is an input wire, an element 24b is an output wire, and an element 29 is a through hole.
FUJIYAMA YOSHITADA
OYAMA TAKAHARU
