RF is a short-term RF in the RF connector. RF is any frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to the antenna, an electromagnetic field is generated, which can then propagate through the space. Many wireless technologies are based on RF field propagation. These frequencies form part of the spectrum of electromagnetic radiation.
Electromagnetic radiation consists of waves of electrical energy and magnetic energy that move together (ie, radiate) in space at the speed of light. In summary, all forms of electromagnetic energy are called electromagnetic spectra. The radio waves and microwaves emitted by the transmitting antenna are a form of electromagnetic energy. Generally, the term electromagnetic field or radio frequency (RF) field can be used to indicate the presence of electromagnetic or RF energy.
The RF field has electrical and magnetic components (electric and magnetic fields), and it is generally convenient to represent the intensity of the RF environment at a given location in units specific to each component. For example, the unit "volts per meter" (V / m) is used to measure the electric field strength, and the unit "ampere per meter" (A / m) is used to indicate the strength of the magnetic field.
RF waves can be characterized by wavelength and frequency. The wavelength is the distance covered by a complete period of electromagnetic waves, and the frequency is the number of electromagnetic waves passing through a given point per unit time. The frequency of the RF signal is usually expressed in units called Hertz (Hz). 1 Hz is equal to one cycle per second. One megahertz (MHz) is equal to one million cycles per second. Different forms of electromagnetic energy are classified by their wavelength and frequency. The RF portion of the electromagnetic spectrum is typically defined as part of the spectrum where the electromagnetic waves have frequencies in the range of about 3 kilohertz (3 kHz) to 300 GHz (300 GHz).