Engineering Terms used in the Antenna Field
"A", "B", "C", "D", "E"/"F", "G"/"H", "I"/"J"/"K"/"L", "M"/"N"/"O",
"P"/"Q", "R", "S", "T", "U" to "Z"

A to Am, An, Ao to Az

Aperiodic Antenna: An antenna designed to have a constant impedance over a wide frequency range.

Aperture: The portion of the plane surface area near the antenna perpendicular to the direction of maximum radiation through which the major portion of the radiation passes. The effective and/or scattering aperture area can be computed for wire antennas which have no obvious physical area.

Aperture Antenna: An antenna with a beam width the size of the horn radiator.

Array: Several simple antennas, usually dipoles, used together to control the direction in which most of the antennas power is radiated.

Artificial Antenna: A dummy antenna.

Atmospheric Attenuation. The attenuation of a radio signal as it passes through the atmosphere because of particles in the atmosphere.

Attenuation: Power loss resulting from conductor resistance and dielectric loss within the insulating material used to separate the conductors. Also see Manufacturers of RF Attenuators. The decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path to the detector, but not including the reduction due to geometric spreading.

Attenuation Coefficient: The rate of diminution of average power with respect to distance along a transmission path.

Attenuation Constant: The real part of the propagation constant in any electromagnetic propagation medium.

Automatic Tracking: Tracking done by equipment that compares the direction of the antenna axis and the direction of the received signal and uses the difference (error) signal to reposition the antenna. Also see Antenna Tracking System Manufacturers.

Azimuth: An angle measured in a horizontal plane from a known reference point.

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