What are the types of reflector antenna?
What are the types of reflector antenna?
The most popular reflector antennas are (1) comer reflectors, and (2) parabolic and paraboloid reflectors. A comer reflector is shown in Figure 5.20. Most comer reflectors have an angle of 90°, but other angles are also used.
What are the applications of reflector antennas?
The parabolic reflector or dish antenna is the form of antenna which finds many uses in domestic satellite television reception, terrestrial microwave data links, general satellite communications and many more.
In which of the following the secondary reflector faces the primary reflector?
In which of the following the secondary reflector faces the primary reflector? Explanation: In Gregorian antenna, sub-reflector is ellipsoidal and has its concave side faces the primary reflector.
Which of the following is used as a secondary antenna in the reflector antenna?
parabolic reflector
Explanation: A parabolic reflector is used as a secondary antenna. Horn and dipole are used for feed antenna. Feed antenna of the reflector antenna is called Primary antenna.
In which of the following secondary reflector is Hyperboloid?
3. In which of the following the secondary reflector faces the primary reflector? Explanation: In Gregorian antenna, sub-reflector is ellipsoidal and has its concave side faces the primary reflector. In Cassegrain, sub-reflector is hyperboloid with its convex side facing the feed.
In which of the following secondary reflector is hyperbolic?
6. In which of the following secondary reflector is concave? Explanation: Cassegrain and Gregorian are dual reflector antennas having primary and secondary reflectors. In Gregorian concave ellipsoidal is used as secondary reflector whereas in Cassegrain convex hyperboloid.
In which of the following secondary reflector is hyperboloid?
What is the function of reflector in antenna?
• Reflectors are used to concentrate flux of EM energy radiated/ received, or to change its direction • Usually, they are parabolic (paraboloidal). – The first parabolic (cylinder) reflector antenna was used by Heinrich Hertz in 1888.
What is the working principle of antenna?
When the antenna acts as a transmitting antenna, the energy from the feed radiates through a horn antenna onto the hyperboloid concave reflector, which again reflects back on to the parabolic reflector. The signal gets reflected into the space from there.
What is the effective radiated power of a parabolic reflector?
The following image shows a Parabolic Reflector Antenna. The gain of the paraboloid is a function of aperture ratio (D/λ). The Effective Radiated Power (ERP) of an antenna is the multiplication of the input power fed to the antenna and its power gain.
What is the frequency range used for the application of parabolic reflector antennas?
The frequency range used for the application of Parabolic reflector antennas is above 1MHz. These antennas are widely used for radio and wireless applications.
