RF transmission is widely used in vehicle monitoring module, remote control, remote sensing, small wireless network, wireless meter reading, entrance guard system, the pager, industrial data acquisition system, wireless label, identification, non-contact RF smart card, small wireless data terminals, security and fire prevention systems, wireless remote control system, meteorological and hydrological monitoring, biological signal acquisition, robot control, wireless 485/422 data communication, digital audio, digital image transmission and even other fields.