HIGH-FREQUENCY CIRCUIT AND HIGH-FREQUENCY COMPONENT

WIPO Patent Application WO/2005/088833

A1

A high-frequency circuit for demultiplexing high-frequency signals of communication methods of different frequencies. The high-frequency circuit comprises a lowpass filter circuit provided between first and second ports and/or a highpass filter circuit provided between the first port and a forth port and a matching circuit and a bandpass filter both provided between the first port and a third port. The lowpass filter circuit, the highpass filter circuit, and the matching circuit each have a capacitance element and inductance element. The bandpass filter circuit is composed of an SAW filter. The passband f1 of the lowpass filter circuit, the passband f2 of the bandpass filter circuit, and the passband f3 of the highpass filter are in a relation f1