FILTER CIRCUIT, DUPLEXER, AND COMMUNICATION APPARATUS

A filter circuit (100) with good passive inter-modulation performance, a duplexer (100a) including the filter circuit (100), and a communication apparatus (1) are disclosed. The filter circuit (100) includes an input port (In) for receiving a radio frequency signal, a series resonator unit (110), a...

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Bibliographische Detailangaben
Hauptverfasser: ZHANG, Lei, TANG, Qingwu, LIU, Zhiyu, GU, Jian, WANG, Weibiao
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:A filter circuit (100) with good passive inter-modulation performance, a duplexer (100a) including the filter circuit (100), and a communication apparatus (1) are disclosed. The filter circuit (100) includes an input port (In) for receiving a radio frequency signal, a series resonator unit (110), a parallel resonator unit (120), and an output port (Out). The series resonator unit (110) is connected between the input port (In) and the output port (Out). The parallel resonator unit (120) cooperates with the series resonator unit (110) to filter the radio frequency signal, and the radio frequency signal is output through the output port (Out). The parallel resonator unit (120) includes at least two parallel resonance tributaries (120a and 120b) that are connected in parallel to each other. The parallel resonance tributaries (120a and 120b) are both connected between a first node (Nout), between the input port (In) and the output port (Out), and a grounding terminal (GND). The parallel resonator tributaries (120a and 120b) each include at least one parallel resonator. A parallel resonator unit is a parallel resonator unit at a level closest to the output port (Out). The parallel resonator includes a first electrode and a second electrode. An electrode, connected to the first node (Nout), in each parallel resonator tributary is the same.