Reactance filter comprising suppression in the stop band and duplexer component

摘要

A reactance filter comprising suppression in the stop band comprises an input connection for applying an input signal, an output connection for outputting an output signal, at least series resonator, which is connected in a signal path between the input connection and the output connection, a parallel resonator, which is connected between the signal path and a connection in order to apply a reference potential, and an inductor, which is connected in series to the parallel resonator. A capacitor is connected by means of one connection between the at least one parallel resonator and the inductor and by means of the additional connection to the output connection. By connecting the reactance filter as a transmission filter in a duplexer component, the isolation in the receiving band of the duplexer component can be improved.

主权项

1. A reactance filter comprising suppression in the stop band, comprising:
an input connection for applying an input signal; an output connection for outputting an output signal; at least one series resonator, which is connected into a signal path between the input connection and the output connection; a plurality of parallel resonators being respectively connected between the signal path and a connection for applying a reference potential, wherein the plurality of parallel resonators is respectively connected to the signal path at different locations, wherein a first one of the parallel resonators is connected to the signal path at a first one of the different locations of the signal path and at least a second one of the parallel resonators is connected to the signal path at a second one of the different locations of the signal path, wherein the first location is arranged nearer to the input connection than the at least one second location, and wherein the at least one second location is arranged nearer to the output connection than the first location; an inductance, which is exclusively connected in series with one of the parallel resonators; and a capacitor having a connection and a further connection, wherein the connection of the capacitor is connected between the first at least one parallel resonator and the inductance and the further connection of the capacitor is connected to the output connection.