DUPLEXER DIELECTRIC FILTER

摘要

PROBLEM TO BE SOLVED: To control the load capacitance and the coupling capacitance of a resonator by forming an open area which corresponds to a reception filtering area and in which a conductive material is not applied to a side of a dielectric block. SOLUTION: A duplexer dielectric filter is constituted of a dielectric block 101 which is formed of confronted upper face and lower face and sides between the upper face and the lower face and the conductive material is applied to at least a part of the lower face and the sides, plural resonance holes 107 which pass through the upper face and the lower face of the dielectric block 101 in an almost parallel state, in which the conductive material is applied to the part of the inner part and which form the resonator, transmission/reception terminals 112a and 112b which are formed of electrode areas insulated from the conductive material on the side of the dielectric block and form electromagnetic coupling with the resonator holes 107 and an open area 125 which is formed on the side of the dielectric block and to which the conductive material controlling the load capacitance and the coupling capacitance of the resonator is not applied.