What is the range of parabolic antenna?
This antenna features high gain, long coverage, light weight, compact structure and excellent wind-resistance. It is used for outdoor and the range is up to 56 km(34.8 miles) .
What is the disadvantage of parabolic reflector?
Like all forms of antenna, the parabolic reflector has its limitations and drawbacks: Requires reflector and drive element: the parabolic reflector itself is only part of the antenna. It requires a feed system to be placed at the focus of the parabolic reflector. Cost : The antenna needs to be manufactured with care.
Where is the power concentrated in a parabolic antenna?
In parabolic antennas, virtually all the power radiated is concentrated in a narrow main lobe along the antenna’s axis. The residual power is radiated in sidelobes, usually much smaller, in other directions. Because in parabolic antennas the reflector aperture is much larger than the wavelength,…
When to use a parabolic antenna for narrow beamwidth?
In order to achieve narrow beamwidths, the parabolic reflector must be much larger than the wavelength of the radio waves used, so parabolic antennas are used in the high frequency part of the radio spectrum, at UHF and microwave ( SHF) frequencies, at which the wavelengths are small enough that conveniently-sized reflectors can be used.
When was the first parabolic reflector antenna made?
German physicist Heinrich Hertz constructed the world’s first parabolic reflector antenna in 1888. The antenna was a cylindrical parabolic reflector made of zinc sheet metal supported by a wooden frame, and had a spark-gap excited 26 cm dipole as a feed antenna along the focal line.
When did Heinrich Hertz invent the parabolic antenna?
The parabolic antenna was invented by German physicist Heinrich Hertz during his discovery of radio waves in 1887.