Electric power receiving and supplying circuit

An electric power receiving and supplying circuit comprising:

• an antenna, including a feeding point, for receiving a transmitted microwave signal and supplying an electric power from the received microwave signal;
• a rectifying circuit, comprising:
• a first diode including an anode, connected to said feeding point, and a cathode;
• a second diode including a cathode, connected to said cathode of said first diode through a junction point, and an anode;
• and a high frequency grounding circuit for high-frequency-grounding said anode of said second diode, said rectifying circuit rectifying said electric power and supplying a rectified electric power from said junction point;
• and
• a lowpass filter for low-pass filtering said rectified electric power to supply a dc supply power;
• wherein said high frequency grounding circuit comprised a resistor and a capacitor connected in parallel to each other.

An electric power receiving and supplying circuit comprising:

• an antenna, including a feeding point, for receiving a transmitted microwave signal and supplying an electric power from the received microwave signal;
• a rectifying circuit, comprising:
• a first diode including an anode, connected to said feeding point, and a cathode;
• a second diode including a cathode, connected to said cathode of said first diode through a junction point, and an anode;
• and a high frequency grounding circuit for high-frequency-grounding said anode of said second diode, said rectifying circuit rectifying said electric power and supplying a rectified electric power from said junction point;
• a lowpass filter for low-pass filtering said rectified electric power to supply a dc supply power;
• and
• an identification signal generation circuit coupled to said lowpass filter and said antenna, wherein said identification signal generation circuit receives said dc supply power from said lowpass filter and supplies an identification signal to said antenna.