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Wireless communication RF circuit and communication apparatus including the same

  • US 7,133,641 B2
  • Filed: 04/23/2003
  • Issued: 11/07/2006
  • Est. Priority Date: 04/23/2002
  • Status: Expired due to Fees
First Claim
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1. A wireless communication radio frequency circuit comprising:

  • an antenna that transmits and receives radio waves;

    a demodulator circuit that detects a received radio wave received by the antenna and extracts a signal wave; and

    a modulator circuit that mixes a signal wave supplied from a signal feeder with a carrier;

    whereinthe antenna, the modulator circuit, and the demodulator circuit are serially connected to one another in a sequence;

    a Single Pole Single Throw switching circuit is serially connected directly between the modulator circuit and the demodulator circuit;

    the Single Pole Single Throw switching circuit is switched ON upon reception to transmit a signal received by the antenna to the demodulator circuit and is switched OFF upon transmission to separate the demodulator circuit from the modulator circuit; and

    the Single Pole Single Throw switching circuit includes an FET.

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