Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

antenna
a device used to couple energy from a guiding structure (transmission line, waveguide, etc.) into a propagation medium, such as free space, and vice versa. It provides directivity and gain for the transmission and reception of electromagnetic waves.
antenna beamwidth
the effective angular extent of the antenna radiation pattern usually specified between points of fixed amplitude relative to the main lobe gain (e.g., -3 dB points).
antenna gain
the maximum ratio of an antenna's ability to focus or receive power in a given direction relative to a standard; the standard is usually an isotropic radiator or a dipole. The gain includes the efficiency of the antenna.
antenna Q
ratio of the energy stored to the energy dissipated (ohmically or via radiation) per cycle.
aperture antenna
an antenna with a physical opening, hole, or slit.
resonant antenna
linear antennas that exhibit current and voltage standing wave patterns formed by reflections from the open end of the wire.
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