pencil beam

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pencil beam

See antenna.

pencil beam

[′pen·səl ‚bēm]
(electromagnetism)
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.

pencil beam

An electronic beam that is narrow, has minimal side lobes, and is strongly directional.