In optics, a pencil or pencil of rays, also known as a pencil beam or narrow beam, is a geometric construct (pencil of half-lines) used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a cone or cylinder. Antennas which strongly bundle in azimuth and elevation are often described as "pencil-beam" antennas.
In optics, a pencil or pencil of rays, also known as a pencil beam or narrow beam, is a geometric construct (pencil of half-lines) used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a cone or cylinder. Antennas which strongly bundle in azimuth and elevation are often described as "pencil-beam" antennas.
Source: Wikipedia "Pencil (optics)" · CC BY-SA 4.0
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