Patent ID: 8868013

Claim:
A signal transmitting apparatus comprising: a signal distributor configured to distribute baseband signals corresponding respectively to a plurality of frequency bands; a frequency converter configured to convert each of the distributed baseband signals into one of a positive frequency signal and a negative frequency signal according to the frequency band; and a frequency synthesizer configured to synthesize the positive frequency signals and the negative frequency signals outputted from the frequency converter to generate a transmission signal, wherein the positive frequency signals and the negative frequency signals are signals included in one predetermined intermediate frequency band, wherein the frequency converter comprises a positive frequency converting unit configured to convert a portion of the distributed baseband signals into positive frequency signals included in a positive frequency region, and a negative frequency converting unit configured to convert the other portion of the distributed baseband signals into negative frequency signals included in a negative frequency region, wherein the signal distributor selects and distributes one of the baseband signals, wherein the frequency converter further comprises a switch configured to provide the selected baseband signal to the frequency synthesizer, and wherein the frequency synthesizer comprises a signal synthesizing unit configured to convert a provided baseband signal into a center frequency signal included in a center frequency region and to synthesize the positive frequency signals, the center frequency signal and the negative frequency signals, and an intermediate frequency converting unit configured to convert the positive frequency signals, the center frequency signal and the negative frequency signals to a second intermediate frequency region different from the intermediate frequency band, wherein the center frequency signal is included in the intermediate frequency band.