DIPLEXER INCLUDING TWO BANDPASS FILTERS

摘要

A diplexer includes a first bandpass filter provided between an input terminal and a first output terminal and selectively passing a signal in a first frequency band, and a second bandpass filter provided between the input terminal and a second output terminal and selectively passing a signal in a second frequency band. The first bandpass filter includes a plurality of first resonators. The second bandpass filter includes a second resonator and a series resonant circuit. The series resonant circuit is composed of a capacitor provided between the input terminal and the second resonator, and an inductance component of a line that connects the input terminal and the second resonator via the capacitor.

主权项

1. A diplexer comprising:
an input terminal to receive a first signal of a frequency within a first frequency band and a second signal of a frequency within a second frequency band higher than the first frequency band; a first output terminal for outputting the first signal; a second output terminal for outputting the second signal; a first bandpass filter provided between the input terminal and the first output terminal and selectively passing the first signal; and a second bandpass filter provided between the input terminal and the second output terminal and selectively passing the second signal, wherein the first bandpass filter includes a plurality of first resonators, the second bandpass filter includes a second resonator, and a series resonant circuit connecting the input terminal and the second resonator, and the series resonant circuit is composed of a capacitor provided between the input terminal and the second resonator, and an inductance component of a line that connects the input terminal and the second resonator via the capacitor.