Patent ID: 7626471

Claim:
A non-reciprocal circuit device comprising a first inductance element L 1 disposed between a first input/output port P 1 and a second input/output port P 2 , a first capacitance element Ci parallel-connected to said first inductance element L 1 to constitute a first resonance circuit, a resistance element R parallel-connected to said first parallel resonance circuit, a second inductance element L 2 disposed between a second input/output port P 2 of said first resonance circuit and a ground, and a second capacitance element Cfa parallel-connected to said second inductance element L 2 to constitute a second resonance circuit, and a third inductance element Lg disposed between said second resonance circuit and the ground, and a third capacitance element Cfb disposed between a second input/output port P 2 of said first resonance circuit and the ground.