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Radio communication equipment

  • US 6,393,299 B1
  • Filed: 03/08/1999
  • Issued: 05/21/2002
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Fees
First Claim
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1. A radio communication apparatus which performs communication by selectively using at least one of a first frequency band and a second frequency band higher than the first frequency band, each frequency band respectively allocated for first and second radio communication systems, comprising:

  • local oscillator signal generating means for generating a local oscillator signal with an arbitrary frequency;

    frequency dividing means for dividing the frequency of the local oscillator signal generated by the local oscillator signal generating means by a factor of N (N>

    0) to produce a frequency-divided local signal having a frequency outside the first and second frequency bands;

    first frequency conversion means for converting a communication signal in the first frequency band using the frequency-divided local signal from the frequency dividing means, wherein the first frequency conversion means includes;

    first down-conversion means for down-converting a first radio-frequency (RF) signal, received on the first frequency band, to a first intermediate-frequency (IF) signal using the frequency-divided local signal from the frequency dividing means; and

    first up-conversion means for up-converting a second IF signal, to be transmitted on the first frequency band, to a second RF signal using the frequency-divided local signal from the frequency dividing means; and

    second frequency conversion means for converting a communication signal in the second frequency band using the local oscillator signal from the local oscillator signal generating means, wherein the second frequency conversion means includes;

    second down-conversion means for down-converting a third RF signal, received on the second frequency band, to a third IF signal using the local oscillator signal.

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