Which term corresponds to the component that gathers EM energy and filters by polarity and frequency?

Which term corresponds to the component that gathers EM energy and filters by polarity and frequency?

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

Answer: (D)

The main idea is that the feedhorn is the device at the focus of a parabolic SATCOM dish that both collects the energy shaped by the dish and imposes the proper mode, polarization, and bandwidth for the signal. The horn’s shape and aperture act as a transition from free-space waves to the guided wave in the feed line, so it naturally filters which electromagnetic modes can pass and which frequencies are efficiently supported. This structural filtering also helps set the polarization: the horn is designed to excite a specific polarization (or dual orthogonal polarizations in dual-polarized systems) and to minimize leakage into other polarizations. In short, the feedhorn gathers the energy from the dish and, through its geometry and connection to the waveguide, selects the appropriate polarization and frequency band for clean, efficient transmission.

The main idea is that the feedhorn is the device at the focus of a parabolic SATCOM dish that both collects the energy shaped by the dish and imposes the proper mode, polarization, and bandwidth for the signal. The horn’s shape and aperture act as a transition from free-space waves to the guided wave in the feed line, so it naturally filters which electromagnetic modes can pass and which frequencies are efficiently supported. This structural filtering also helps set the polarization: the horn is designed to excite a specific polarization (or dual orthogonal polarizations in dual-polarized systems) and to minimize leakage into other polarizations. In short, the feedhorn gathers the energy from the dish and, through its geometry and connection to the waveguide, selects the appropriate polarization and frequency band for clean, efficient transmission.