A parabolic reflector that collects and focuses radio waves from space onto a receiver at its focal point. The curved shape concentrates weak cosmic radio signals, allowing radio telescopes to detect faint emissions from distant celestial objects.
Compound of 'dish' from Old English 'disc' (plate, shallow vessel) describing the shape, and 'antenna' from Latin meaning 'sail yard' or 'feeler.' Originally a nautical term for ship rigging, 'antenna' was adopted for radio technology in the early 1900s due to resemblance to insect antennae that sense their environment.
The parabolic shape of a dish antenna is mathematically perfect - every radio wave that hits the surface bounces to exactly the same focal point, no matter where it strikes! This means a 100-meter dish can collect whisper-faint radio signals from galaxies billions of light-years away and concentrate them into a beam smaller than a pencil tip.
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