11 Facts About Parabolic antenna

Parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves to the receiver in its focal point.

Parabolic antenna was invented by German physicist Heinrich Hertz during his discovery of radio waves in 1887.

Parabolic antenna used cylindrical parabolic reflectors with spark-excited dipole antennas at their focus for both transmitting and receiving during his historic experiments.

The feed Parabolic antenna is connected to the associated radio-frequency transmitting or receiving equipment by means of a coaxial cable transmission line or waveguide.

Radiation pattern of the feed Parabolic antenna has to be tailored to the shape of the dish, because it has a strong influence on the aperture efficiency, which determines the Parabolic antenna gain .

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Pattern of electric and magnetic fields at the mouth of a parabolic antenna is simply a scaled up image of the fields radiated by the feed antenna, so the polarization is determined by the feed antenna.

The receiving feed Parabolic antenna must have vertical polarization to receive them; if the feed is horizontal the Parabolic antenna will suffer a severe loss of gain.

The ability of an Parabolic antenna to keep these orthogonal channels separate is measured by a parameter called cross polarization discrimination .

Theoretical considerations of mutual interference where specific antenna performance has not been defined, a reference antenna based on Recommendation ITU-R S 465 is used to calculate the interference, which will include the likely sidelobes for off-axis effects.

The first parabolic antenna used for satellite communications was constructed in 1962 at Goonhilly in Cornwall, England to communicate with the Telstar satellite.

The Cassegrain Parabolic antenna was developed in Japan in 1963 by NTT, KDDI and Mitsubishi Electric.