Radio Propagation
37 entries in the Radio Propagation compendium.
Radio propagationRadio waves travel via line-of-sight, ground wave, and skywave modes.Index of radio propagation articlesReference compendium of radio propagation terminology.Airplane scatterMomentary radio propagation via reflection from passing aircraft.Anomalous propagationRadio propagation beyond the normal horizon due to atmospheric anomalies.Artificial dielectricsFabricated composites mimicking dielectrics for microwave manipulation.Atmospheric ductA horizontal atmospheric layer that guides radio waves around Earth's curvature.Carrier-to-noise ratioRatio of modulated carrier power to noise power in a receiver.Channel soundingEvaluates radio environments for MIMO wireless system design.Chapman functionChapman function models slant-path atmospheric integration on a spherical Earth.Clutter (radar)Unwanted radar echoes from natural and man-made sources.Clutter foldingClutter folding occurs when clutter range exceeds the PRF interval.Co-channel interferenceCrosstalk from two transmitters using the same channel.Coherence bandwidthFrequency range over which channel fading is correlated.Communication with submarinesSubmerged submarines use VLF and ELF radio for one-way communication.Communications blackoutA loss of communications capability due to power, ionospheric, or atmospheric causes.Critical frequencyThe frequency boundary between ionospheric reflection and penetration at vertical incidence.DBmLogarithmic power unit referenced to one milliwatt, used in communications.Doppler effectFrequency shift due to relative motion between source and observer.Earth–ionosphere waveguideNatural waveguide between Earth and ionosphere for ELF and VLF waves.Earth–Moon–Earth communicationMoon bounce enables two-way radio via lunar reflection.Radio beaconA fixed transmitter used for navigation, direction finding, and emergency location.Epstein profileExactly solvable refractive-index profile for stratified media.F regionThe ionospheric layer with the highest free electron concentration.F2 propagationRare VHF skywave reflection off the F2 ionospheric layer.Forward scatterForward scattering deflects waves by small angles, continuing near their original direction.Fresnel zoneEllipsoidal zones predicting wave interference from path obstructions.Fresnel zone antennaA diffractive antenna using phase control for focusing.Group velocityVelocity of the envelope of a wave packet.International Beacon ProjectA worldwide network of HF beacons for assessing ionospheric propagation.International Reference IonosphereInternational standard empirical model of the terrestrial ionosphere.IonosphereIonized upper atmosphere enabling long-distance radio propagation.Ionospheric absorptionIonospheric absorption is the primary limiting factor in radio propagation.Ionospheric soundingReal-time technique for measuring ionospheric layer altitudes via radio signals.Kennelly–Heaviside layerIonised layer reflecting medium-frequency radio waves beyond the horizon.Lateral waveInterfacial waves launched at grazing incidence, distinct from conventional surface waves.Line-of-sight propagationRadio waves above 30 MHz travel in a direct visual path.Link budgetAn accounting of gains and losses in a telecommunication system.
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