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Transmission/reception integrated radio-frequency apparatus

  • US 7,159,236 B2
  • Filed: 02/28/2001
  • Issued: 01/02/2007
  • Est. Priority Date: 06/30/2000
  • Status: Expired due to Fees
First Claim
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1. A transmission/reception integrated radio-frequency apparatus comprising,an input/output terminal for inputting/outputting of a radio-frequency signal;

  • a reception system block for processing a reception radio-frequency signal supplied to the input/output terminal;

    a transmission processing section including a semiconductor element for outputting a transmission radio-frequency signal to the input/output terminal;

    a first high-pass filter connected between the reception system block and the input/output terminal and having a first cut-off frequency (lower-limit frequency) less than a lower-limit frequency of reception frequencies;

    a second high-pass filter connected to an output terminal of the transmission processing section and having a second cut-off frequency (lower-limit frequency) in a frequency band lower than said first cut-off frequency;

    a low-pass filter connected between the second high-pass filter and the input/output terminal and having a cut-off frequency (upper-limit frequency) in a frequency band which is higher than said second cut-off frequency and tower than said first cut-off frequency; and

    an overvoltage breakdown protection circuit connected between the output terminal of the transmission processing section and the second high-pass filter.

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