"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"

Scatter Angle: The angle at which the receiving antenna must be aimed to capture the scattered energy of tropospheric scatter.

Scattering: The spreading or breaking up of electromagnetic waves when they encounter objects of different electrical properties than those in which the wave is traveling.

Schmidt Antenna: A style of scanning microwave antenna.

Shortened dipole: A dipole antenna made to resonate at a lower frequency by use of a coil.

Signal: A radio wave that contains the transmitted message.

Signal loss: The amount of signal power lost between the transmitter and receiver.

Signal-to-noise ratio: [SNR] The power intensity of the signal compared to that of the noise.

Single, Stationary-Lobe System. Antenna (with a single, stationary beam) that is rotated to obtain 360-degree coverage.

Skip distance: The distances on the Earth’s surface between the points where a radio wave sky wave leaves the antenna and is successfully reflected and/or refracted back to Earth from the ionosphere. At a given azimuth, the minimum distance between the transmitting station and the closest point of return to the Earth of a transmitted wave reflected from the ionosphere.

Skip zone: The space or region within the transmission range where signals from a transmitter are not received, i.e., between the ground wave and the point where the refracted wave returns.

Sky wave: A radio wave that is reflected from the ionosphere. A radio wave that travels upward from the antenna.

Sloping long-wire antenna: A wire antenna of length greater than one wave-length and supported in an inclined orientation with respect to the ground.

Slot Antenna: A radiating element formed by a slot in a conducting surface or in the wall of a waveguide.

Spoiler Antenna: An antenna used to change (spoil) the antenna pattern of a second antenna so as to reduce the nulls in the pattern of the second antenna. See also Null Fill.

Spreader: Insulator used with transmission lines and antennas to keep the parallel wires separated.

Standing-wave: The distribution of voltage and current formed by the incident and reflected waves which have minimum and maximum points on a resultant wave that appears to stand still.

Standing-wave ratio: [SWR] The ratio of the maximum to minimum amplitudes of voltage, or current, along a transmission line.

Standing waves: Waves that appear not to be moving as the result of power traveling in both directions along a transmission line.

Stratosphere: The second layer of the Earth’s atmosphere, extending from 10 to 50 km.

Stub: Short section of a transmission line used to match the impedance of a transmission line to an antenna.

Superturnstile Antenna: A stacked antenna with radiation elements shaped like a bat-wing.

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Antenna "T" Terms and definitions

 
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