Patent ID: 7546091
Filing Date: 2009-06-09
Classification: H03H,H04B

Abstract:
1. 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 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 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