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Omnidirectional antenna

An antenna is a resonant device that transmits and/or receives electromagnetic waves. Electromagnetic waves are often referred to as radio waves. Antennas in transmitters convert electrical signals into airborne radio frequency (RF) waves, and in receivers they convert airborne waves into electrical signals. Without antennas there are no wireless communications. An antenna must be tuned to the same frequency band that the radio system to which it is connected. The directivity of an antenna is defining a radiation of the RF energy directionally. Accordingly antennas are usually classified by the radiation characteristics into omnidirectional and directional antennas. Directional antennas focus energy in a particular direction. Directional antennas are primary used in applications where the coverage is preferable over some particular sector, and when one site needs to connect to only one other site or to multiple sites in same directional line, and omnidirectional coverage is not required. The most common type of antenna for transmitting and receiving signals at a mobile station is a monopole or omnidirectional antenna. Omnidirectional antennas transmit and receive signals omnidirectionally, i.e., transmit signals to and receive signals from all directions.

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