Duplexer dielectric filter

Abstract

A duplexer dielectric filter comprises a dielectric block, a first filtering area including resonators having resonant holes disposed to pass through first and second surfaces of the dielectric block in a substantially parallel manner, a second filtering area including resonators having resonant holes disposed to pass through the first and second surfaces of the dielectric block in a parallel manner; first conductive pattern formed on the surroundings of the resonant holes of the first surface, thus to be connected with the conductive material covered with the interior of the resonant holes and for applying a loading capacitance to the resonators and an electromagnetic coupling between adjacent resonators, a second conductive pattern disposed on the first surface of the first filtering area along the arrangement direction of the resonant hole and for forming the electromagnetic coupling between the adjacent resonators, third conductive pattern disposed on the first surface of the first filtering area for forming the electromagnetic coupling between the adjacent resonators, and fourth conductive pattern disposed on the first surface for adjusting resonant frequencies of the resonators.