Patent ID: 11929725
Assignee: ANHUI ANUKI TECHNOLOGIES CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A multiplexer, comprising a bandpass filter circuit wherein the bandpass filter circuit comprises:
at least one electromagnetic LC filter circuit and at least one acoustic wave resonance unit,
wherein the at least one acoustic wave resonance unit comprises an input port, an output port, at least one circuit element and at least three resonators; the at least one electromagnetic LC filter circuit is electrically connected to the at least one acoustic wave resonance unit, and the at least three resonators include at least one first resonator and at least one second resonator; in a case where the at least one first resonator comprises one first resonator, the one first resonator is connected in series between the input port and the output port, and in a case where the at least one first resonator comprises a plurality of first resonators, the plurality of first resonators connected in series are connected in series between the input port and the output port; each of the at least one second resonator is connected to a respective terminal of the at least one first resonator; and the at least one circuit element is connected between the input port and the output port, wherein the circuit element comprises an inductor structure or a capacitor structure;
wherein the at least one acoustic wave resonance unit comprises three resonators; the three resonators are connected in a shape of π; and the circuit element is an inductor structure;
wherein a resonant frequency of the at least one first resonator is within a passband frequency range of the bandpass filter circuit, a resonant frequency of the at least one second resonator is within an adjacent band frequency range of the bandpass filter circuit, and a frequency within the adjacent band frequency range is lower than a frequency within the passband frequency range.