pencil beam(redirected from Pencil (physics))
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pencil beamSee antenna.
pencil beam[′pen·səl ‚bēm]
A beam of radiant energy concentrated in an approximately conical or cylindrical portion of space of relatively small diameter; this type of beam is used for many revolving navigational lights and radar beams.
An electronic beam that is narrow, has minimal side lobes, and is strongly directional.