Y
Yagi antenna: An antenna that is configured to maximise directional gain. This is often achieved by the use of a dipole radiator (driven element), with a reflector mounted behind the dipole and one or more directors in front. (Figure Y.1.) Only the driven element connects to the antenna feed. The other elements are passive and currents are induced in them by mutual coupling, their spacing ensuring that this is in the correct amplitude and phase to give a directional radiation pattern. Named after its inventor, Hidetsugu Yagi, a Japanese physicist.
Yahoo: A popular programme used for searches on the World Wide Web (WWW), where it can locate Internet sites by their content.
yellow alarm: An alarm signal, used in a T1 system, to indicate a fault. ...
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