RF Glossary: R | Terms Starting with R

Radar (Radio Detection and Ranging) — A system that transmits electromagnetic pulses and analyzes the reflected signals to determine the range, velocity, and characteristics of targets.

Radiation Pattern — A graphical representation of an antenna's radiation properties as a function of spatial coordinates, showing gain in all directions.

Receiver (RX) — A device or system that captures, amplifies, filters, and demodulates RF signals to extract the transmitted information.

Reflection Coefficient (Gamma) — The ratio of reflected wave amplitude to incident wave amplitude at an impedance discontinuity. Related to VSWR by: VSWR = (1+|G|)/(1-|G|).

Rejection — The attenuation provided by a filter at specified frequencies in its stopband, measured in dB below the passband level.

Resonance — The condition where a circuit or cavity naturally oscillates at a specific frequency where inductive and capacitive reactances are equal and opposite.

Return Loss (RL) — The ratio of incident power to reflected power at a port, expressed in dB. Higher return loss indicates a better impedance match.

RF (Radio Frequency) — Electromagnetic radiation in the frequency range from about 3 kHz to 300 GHz, encompassing all radio communications and radar bands.

Ripple — Periodic variations in the amplitude response of a filter or amplifier across its operating frequency band.

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