Patent ID: 6393299
Filing Date: 2002-05-21
Classification: H03D,H04B

Abstract:
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.