High-frequency circuit and high-frequency device

Details High-frequency circuit and high-frequency device High-frequency circuit and high-frequency device

2005-03-16

2009-06-09

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

C455S083000, C333S100000

Reexamination Certificate

active

07546091

ABSTRACT:
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 the first port and a fourth port; and a matching circuit and a bandpass filter circuit disposed between the first port and a third port; the lowpass filter circuit, the highpass filter circuit and the matching circuit comprising capacitance elements and inductance elements; the bandpass filter circuit being a SAW filter; and the passband f1of the lowpass filter circuit, the passband f2of the bandpass filter circuit, and the passband f3of the highpass filter circuit meeting the condition of f1<f2<f3.

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