Patent ID: 7546091

Claim:
A high-frequency circuit for branching high-frequency signals for pluralities of communications systems of different frequencies, which comprises: a lowpass filter circuit disposed between first and second ports and/or a highpass filter circuit disposed between said first port and a fourth port; and a matching circuit and a bandpass filter circuit disposed between said first port and a third port; said matching circuit having an inductance element disposed between said first port and ground, and a capacitance element disposed between said first port and said bandpass filter circuit; said bandpass filter circuit being a SAW filter; the passband f 1 of said lowpass filter circuit, the passband f 2 of said bandpass filter circuit, and the passband f 3 of said highpass filter circuit meeting the condition of f 1 <f 2 <f 3 ; said lowpass filter circuit having a parallel resonance circuit comprising an inductance element and a capacitance element, said parallel resonance circuit having a resonance frequency within the passband f 2 of said bandpass filter circuit; said highpass filter circuit having a series resonance circuit comprising an inductance element and a capacitance element, said series resonance circuit having a resonance frequency within the passband f 2 of said bandpass filter circuit.