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Beam steeringBeam steering: Changing the direction of the main lobe of a radiation pattern.Note: In radio systems, beam steering may be accomplished by switching antenna elements or by changing the relative phases of the rf signals driving the elements. In optical systems, beam steering may be accomplished by changing the refractive index of the medium through which the beam is transmitted or by the use of mirrors or lenses. Source: from Federal Standard 1037C 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Beam steering".