Radio Frequency(RF) Fundamentals
An energy wave transmitted by a transmitter antenna is called radio wave. It is a complex form of energy containing both electric and
magnetic fields. As
such radio waves are also called as EM waves or radiation. Like the light and heat waves, these can be reflected, refracted and diffracted
in the atmosphere.
The basic shape of the wave generated by a transmitter is a sine wave. However, once radiated into the space, it may not retain the
characteristics of the sine wave in total.
There is bound to be distortion.
Radiowaves are often referred to by their wavelength(in meters) rather than by frequency(in Hertz). A wavelength is the space occupied
by one full cycle of a radio wave at a given time. The frequency
and wavelength are related by,
In the EM spectrum, the frequencies in the range 3KHz to 300GHz are called Radio Frequencies(RF) as they are commonly uses in radio
This part of the RF spectrum(3KHz - 300GHz) is divided into bands. Each band is 10 times higher in frequency than the one immediately below it. The RF
bands are listed in the table.