Patent ID: 8102220

Claim:
A non-reciprocal circuit device comprising: a permanent magnet; a ferrite arranged to receive a direct-current magnetic field from the permanent magnet; a first central electrode and a second central electrode arranged on the ferrite so as to cross each other and so as to be electrically insulated from each other, a first end of the first central electrode is electrically connected to an input port and a second end of the first central electrode is electrically connected to an output port, a first end of the second central electrode is electrically connected to the output port and a second end of the second central electrode is electrically connected to a ground port; a first matching capacitor electrically connected between the input port and the output port; a second matching capacitor electrically connected between the output port and the ground port; a terminating resistor electrically connected between the input port and the output port; wherein the non-reciprocal device is arranged to allow high frequency signals to easily flow in a forward direction but not to easily flow in a reverse direction; characteristics of the terminating resistor and the first central electrode are set such that when high frequency signals flow in the reverse direction, power consumption at the first central electrode is increased due to a decreased equivalent parallel resistance of the first central electrode in relation to a power consumption at the terminating resistor.