Patent ID: 7580727

Claim:
A multi-mode radio module comprising: a terminal for connection to signal propagating and receiving means, a transmitting branch coupled to the terminal, and a branching circuit coupled to the terminal, the branching circuit comprising at least a first and a second branch for receiving signals in first and second frequency bands, respectively, each of the first and second branches comprising: a phase shifting circuit, wherein the phase shifting circuit has an input terminal and an output terminal, the input terminal of the phase shifting circuit being coupled to the terminal, a band pass filter coupled to the output terminal of the phase shifting circuit, the bandwidth of the filter being selected to pass a wanted signal in one of the first and second frequency bands but reject an unwanted signal in the other of the second and first frequency bands, and a low noise amplifier coupled to an output of the band pass filter, wherein the phase shifting circuit has input impedance and output impedance, the input impedance being smaller than the output impedance, the input impedance being applied to the terminal through the input terminal of the phase shifting circuit, the output impedance being applied to the band pass filter through the output terminal of the phase shifting circuit.