What are the advantages of parabolic reflectors
Answers
Answer:
Some of the major advantages of the parabolic reflector antenna include the following:
High gain:
Parabolic reflector antennas are able to provide very high levels of gain. The larger the 'dish' in terms of wavelengths, the higher the gain.
High directivity:
As with the gain, so too the parabolic reflector or dish antenna is able to provide high levels of directivity. The higher the gain, the narrower the beamwidth. This can be a significant advantage in applications where the power is only required to be directed over a small area. This can prevent it, for example causing interference to other users, and this is important when communicating with satellites because it enables satellites using the same frequency bands to be separated by distance or more particularly by angle at the antenna.
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Parabola has a sharp focus, as you know.
Now the thing is, in case of parabolic reflectors, the marginal as well as the paraxial rays of light are focused on the focus of the parabola sharply,thus a sharp image is formed. But in case of spherical reflectors, these rays do not get focused at a sharp point. Marginal rays are focused somewhat nearer than the paraxial rays, thus it suffers from spherical aberrations due to which image formed is blurred.
See the attachment
