| 摘要 |
A miniature and inexpensive transmitter/receiver apparatus is disclosed which is satisfactorily applicable to microwave band communications even if the isolation between descrete circuits is insufficient. The transmitter/receiver apparatus includes a local oscillator for generating a local oscillation frequency at a predetermined position between a transmit and a receive frequency band. Also included is a transmit frequency converter for converting a transmit intermediate frequency band into the transmit frequency band based on the local oscillation frequency such that a transmit image frequency band of the transmit frequency band does not overlap the receive frequency band. The apparatus also includes a receive frequency converter for converting, based on the local oscillation frequency, the receive frequency band into a receive intermediate frequency band, which does not overlap the transmit intermediate frequency band, such that a receive image frequency band of the receiver intermediate frequency band does not overlap the transmit frequency band. |
