Patent ID: 11929539
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The directional coupler according to claim 1, wherein the directional coupler comprises:
a third amplifier circuit to output either a current directly proportional to the first voltage applied to the one end of the resistive element or a current directly proportional to the second voltage applied to the other end of the resistive element;
a fourth amplifier circuit to output a third current which is directly proportional to the voltage difference between the first voltage and the second voltage and whose polarity is different from that of the current outputted from the third amplifier circuit when a signal is flowing from the second terminal to the first terminal, and to output a fourth current which is directly proportional to the voltage difference and whose polarity is identical to that of the current outputted from the third amplifier circuit when a signal is flowing from the first terminal to the second terminal; and
a second adder circuit to output either a signal having a voltage value directly proportional to a current which is a sum total of the current outputted from the third amplifier circuit and the third current or a signal having a voltage value directly proportional to a current which is a sum total of the current outputted from the third amplifier circuit and the fourth current to a fourth terminal.