Definition of Antenna terms
"A", "B", "C", "D", "E", "F", "G"/"H", "I"/"J"/"K"/"L", "M"/"N"/"O",
"P"/"Q", "R", "S", "T", "U"/"V"/"W"/"X"/"Y"/"Z"

Earth Station: The ground-based portion of a satellite communications system, also called a ground station. The station consists of an antenna and receiver (or transceiver) that are in communication with a satellite in geosynchronous orbit.

Military Satellite Antenna
SAT Antenna

Efficiency: The ratio of power output to power input.

Effective Antenna Height: [Effective Height] The height of the center of radiation of an antenna above the effective ground level. In low-frequency applications involving loaded or non-loaded vertical antennas, the moment of the current distribution in the vertical section divided by the input current. Note: For an antenna with symmetrical current distribution, the center of radiation is the center of distribution. For an antenna with asymmetrical current distribution, the center of radiation is the center of current moments when viewed from points near the direction of maximum radiation.

Effective Antenna Length: Text in review.

Effective Monopole Radiated Power: [e.m.r.p.] The product of the power supplied to the antenna and its gain relative to a short vertical antenna in a given direction.

Effective Radiated Power: [ERP] The antenna power times the antenna power gain squared.

Effective Radiated Power; Distance Per Watt, Cell Antenna
Effective Radiated Power

Electric Dipole: See Dipole.

Electromagnetic field: The field of force that an electrical current produces around the conductor through which it flows.

Electromagnetic waves: A wave propagating as a periodic disturbance of the electric and magnetic fields and having a frequency in the electromagnetic spectrum; the means by which energy is transmitted from one place to another.

Electrostatic Discharge: [ESD] The rapid, spontaneous transfer of electrostatic charge induced by a high electrostatic field. Usually the charge flows through a spark (static discharge) between two bodies at different electrostatic potentials as they approach one another.
More information; all about electrostatic discharge page.

Element: A part of an antenna that can be either an active radiator or a parasitic radiator.

Elevation: The angle between the horizontal plane and the line of sight to a target or object.

Elevation-over-Azimuth Mount: An antenna mounting style that uses the azimuth as the primary movement and the elevation as the secondary movement. An alternate style is the X-Y mount.

Emission: The electromagnetic energy radiated from an antenna.

End-Fed: An antenna whose power is applied to one end rather than at some point between the ends.

End-Feed Method. A method in which one end of an antenna is connected through a capacitor to the final output stage of a transmitter.

End-Fire Array. An array in which the direction of radiation is parallel to the axis of the array.

PC motherboard

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