HIGH-FREQUENCY DUAL BAND PASS FILTER USING DIELECTRIC CERAMIC

摘要

PURPOSE: A high-frequency dual band pass filter is provided to be small and light and have a good filtering property of different frequency bands. CONSTITUTION: The first and second band pass filters(30,40) are connected in parallel between a signal input terminal(11) and a signal output terminal(12) so as to filter different frequency bands. A connection node between the signal output terminal and the first band pass filter is connected to a ground via a signal compensation unit, and a connection node between the signal output terminal and the second band pass filter is connected in series to an inductor for matching a phase. The first and second impedance matching resistors(R1,R2) are connected between both ends of the first and second band pass filters. Each of the first and second band pass filters consists of a plurality of dielectric resonators connected to condensers. The signal compensation unit consists of the first resistor(R3) connected in series between the first band pass filter and the signal output terminal and the second and third resistors(R4,R5). The first to third resistors is a phi-type pad that configured such that both ends of the first resistor are grounded through connected in parallel.