RF Glossary: F | Terms Starting with F

Faraday Rotation — The rotation of the plane of polarization of an electromagnetic wave as it passes through a magnetized ferrite material.

Feedhorn — A horn antenna used to illuminate or collect energy from a reflector antenna, designed to provide optimal aperture illumination.

Ferrite — A ceramic magnetic material used in circulators, isolators, and phase shifters that exhibits nonreciprocal behavior when magnetized.

Filter — A frequency-selective network that passes desired frequencies while attenuating unwanted frequencies.

Flange — A mechanical interface used to connect waveguide sections together, providing both mechanical alignment and electrical continuity.

FM (Frequency Modulation) — A modulation technique where the instantaneous frequency of the carrier is varied in proportion to the information signal amplitude.

Free Space Path Loss (FSPL) — The attenuation of an electromagnetic wave due to spreading as it propagates through free space, proportional to frequency squared and distance squared.

Frequency — The number of complete cycles of an electromagnetic wave per second, measured in hertz (Hz).

Frequency Multiplier — A nonlinear device that generates an output signal at a harmonic of the input frequency.

Friis Equation — An equation relating received power to transmitted power, antenna gains, wavelength, and distance for a free-space radio link.

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