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In broadcast engineering, directional array refers to an antenna array arranged such that the superposition of the electromagnetic waves produce a predictable electromagnetic field. By spacing 2 or more antenna elements apart, changing the length of the transmission line from the transmitter, varying the power output, and shifting the phase, radio broadcasters can "shape" the area of signal coverage.

Geographically close co-channel or adjacent channel stations employ directional arrays (or a single directional antenna) so that other broadcasters may utilize the same or adjacent frequency. In the United States, the Federal Communications Commission offers a first-come, first-served approach, meaning licenses granted on co-channel or adjacent channels must protect the service contour of the previously licensed facility, thus, a directional array may be used to "shape" the station around existing facilities.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Directional_array — Please support Wikipedia.
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2 news items

Live Design

Live Design
Mon, 07 Apr 2014 16:26:15 -0700

Four arrays of nine M'elodie loudspeakers each covered the wide seating arc, with three 700-HP subwoofers flown in a steered directional array. Fill was provided by 10 UPM-2P and six UPA-1P loudspeakers and two UPJ-1P VariO™ loudspeakers.

Rugged PC Review

Rugged PC Review
Tue, 25 Mar 2014 07:29:37 -0700

Motion has always been big on audio, and so the R12 includes a multi-directional array microphone system as well as two speakers. For wireless, there's a Intel Dual Band Wireless-AC 7260 WiFi module that also includes Bluetooth 4.0. Optionally ...

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