A Radio Frequency (RF) signal refers to a wireless electromagnetic signal act as a form of communication via radio waves which is a kind of electromagnetic radiation with identified RF range from 3kHz to 300 GHz. Radio waves occur from sun flares and lightning naturally with the frequency rate of radio waves oscillation. The propagation of RF occurs at the speed of light and does not require a medium to travel.
Wireless technology allows two or more devices communicate wirelessly, without any physical link connected. The wireless signals spread over in the air, it will receive and interpret by appropriate antennas. When an antenna is attached to the electrical circuit of a wireless device, it converts the digital data into wireless signals then spread all over with its frequency range. The receptor on the other end receives these signals and converts them back to digital data.
Humankind communicates with created different radio waves that oscillate at various chosen frequencies. Wireless Transmission communication is used in many devices including alarm system, wireless sensor, remote on/ off devices, smart home gadget and more for other industry devices.
THE ADVANTAGES :
．Special RF packet
．Long distance range
．Low power consumption
．Long life time