Which component collects the EM energy and selects polarity and frequency while rejecting unwanted signals?

Which component collects the EM energy and selects polarity and frequency while rejecting unwanted signals?

• A. Feedhorn
• B. Reflector
• C. Aperture
• D. Polarization

Answer: (A)

The feedhorn is the element that gathers the incoming EM energy from the parabolic reflector and couples it into the receiver. Its geometry and the waveguide/horn design determine the polarization of the signal that is carried into the system, and the horn operates efficiently only over the intended frequency band, helping reject out-of-band energy. The horn’s directional pattern also suppresses signals from directions outside the main beam, adding another layer of unwanted-signal rejection. In contrast, a reflector mainly focuses energy, the aperture defines the opening size, and polarization refers to a separate aspect of the antenna system rather than the energy-collection and channel-selection function carried out by the feedhorn.

The feedhorn is the element that gathers the incoming EM energy from the parabolic reflector and couples it into the receiver. Its geometry and the waveguide/horn design determine the polarization of the signal that is carried into the system, and the horn operates efficiently only over the intended frequency band, helping reject out-of-band energy. The horn’s directional pattern also suppresses signals from directions outside the main beam, adding another layer of unwanted-signal rejection. In contrast, a reflector mainly focuses energy, the aperture defines the opening size, and polarization refers to a separate aspect of the antenna system rather than the energy-collection and channel-selection function carried out by the feedhorn.