Patent ID: 9294070
Filing Date: 2016-03-22
CPC Classification: H03H

Claim Text:
1. A duplexer, comprising a substrate, which has at least one patterned metallization plane, and, arranged at least partly on the substrate, a transmission path and a reception path, which are both connected to an antenna connection, comprising: a transmission filter, which is arranged in the transmission path and which has a first acoustic wave filter having one or more resonators; a reception filter, which is arranged in the reception path and next to the antenna, and which has a second acoustic wave filter having one or more resonators and has a single-ended output; and in the reception path a balun connected downstream of the reception filter, the balun supplying a balanced signal on the output side and being embodied as an LC circuit, wherein at least one inductance or at least one capacitance of the balun is realized in the patterned metallization plane of the substrate, wherein the substrate is constructed from a multilayer ceramic, wherein the first acoustic wave filter or the second acoustic wave filter has at least one resonator that operates with bulk acoustic waves, wherein the balun has: wherein the transmission filter has a first matching network, wherein the reception filter has a second matching network, wherein the balun, the first matching network, the second matching network, and an antenna matching network are integrated into the substrate constructed from the multilayer ceramic, and wherein the substrate has at least one soldering pad and the soldering pad is at least partly utilized as the third capacitance.