In radio engineering,antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. Antennas are essential components of all radio equipment.

Antennas can be classified as omnidirectional antennas,or directional antenna(or beam antenna), high-gain antenna, or low-gain antenna

Omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis. Omnidirectional antennas are widely used for radio broadcasting antennas,and in mobile devices that use radio.

Directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. This can increase the power transmitted to receivers in that direction, or reduce interference from unwanted sources.

High-gain antenna (HGA) is a directional antenna with a focused, narrow beam width, permitting more precise targeting of the radio signals.

Low-gain antenna (LGA) is an omnidirectional antenna with a broad radiowave beam width. They are often used in spacecraft.

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