• Any particle, body, material, or system, which emits radiation.
  • The part of an antenna or element which emits radio waves. Also called antenna radiator.
  • A device or surface which vibrates to produce sound waves. Examples include headphone diaphragms, speaker cones, and distributed-mode speaker panels. Also called acoustic radiator, or sound radiator. 4, An enclosure which is sealed, except for a small opening through which radiant energy may enter or escape. The radiation of such an enclosure approximates that of a blackbody. Also called cavity radiator.

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