Patent ID: 11947032
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 3:
4. The full duplex radio apparatus according to claim 3, wherein:
the variable impedance component comprises the variable phase shifter and the variable resistance;
the variable phase shifter comprises:
a hybrid coupler comprising an eighth port, a ninth port, a tenth port, and an eleventh port;
a first varactor diode; and
a second varactor diode;

the eighth port of the hybrid coupler is coupled to the fourth port of the first directional coupler;
the ninth port of the hybrid coupler is coupled to an anode of the first varactor diode;
the tenth port of the hybrid coupler is coupled to an anode of the second varactor diode;
a cathode of the first varactor diode and a cathode of the second varactor diode are coupled to a phase control input;
the variable resistance comprises:
a capacitor comprising a first terminal and a second terminal, the first terminal being coupled to the eleventh port of the hybrid coupler; and
a PIN diode;

the anode of the PIN diode is coupled to the second terminal of the capacitor and an amplitude control input; and
the cathode of the PIN diode is coupled to ground.