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| name = Radio-frequency engineering | official_names = Radio-frequency engineer ...

[[Category:Radio frequency propagation]] ...

...description|Scheme where multiple sites share a precise reference time or frequency}} ...sfer''' is a scheme where multiple sites share a precise reference time or frequency. ...

...1961.</ref> refers to the phenomenon in which certain [[Radio propagation|radio waves can propagate]] in the space between the ground and the boundary of t [[Extremely low frequency]] (ELF) (< 3&nbsp;kHz) and [[very low frequency]] (VLF) ...

...sponding free-space wavelength of 10μm. The permittivity of silver at this frequency is {{nowrap|(-2700 + 1400i)}}. The picture is {{nowrap|(0.6 × 10μm)}} acros ...st=Valone |editor1-first=Tom |chapter=Bell Labs and the Radio Surface Wave Propagation Experiment |title=Nikola Tesla's Electricity Unplugged: Wireless Transmissi ...

...because there are different interactions with circuits, transmissions and propagation characteristics at microwave frequencies. Some theories and devices that pertain to this field are [[antenna (radio)|antennas]], [[radar]], [[transmission line]]s, space based systems ([[remo ...

...e optics''', is the branch of [[optics]] that studies [[Interference (wave propagation)|interference]], [[diffraction]], [[Polarization (waves)|polarization]], an ...high-frequency approximation, it is often more accurate in optics than for radio. ...

...mb|A frequency vs. time plot ([[spectrogram]]) showing several [[Whistler (radio)|whistler]] signals amidst a background of sferics as received at [[Palmer A '''radio atmospheric signal''' or '''sferic''' (sometimes also spelled "spheric") is ...

...at approximately the same frequency as the [[Cyclotron resonance|gyratory frequency]] induced by the magnetic field. Pedersen currents are associated with a '' ...{cite journal |last1=Pedersen |first1=Peder Oluf |title=The Propagation of Radio Waves along the Surface of the Earth and in the Atmosphere |journal=Danmark ...

...le:Vixar3.jpg|bottom|thumb|300px|Example of multi-path [[radio propagation|propagation]]]] ...ication is difficult due to factors such as multi-path [[radio propagation|propagation]], time variations of the channel, small available bandwidth and strong [[a ...

where ''ε''(''ω'') is the [[complex number|complex]] frequency-dependent [[permittivity]] of the material, and ''ε''₀ is the [[ The relative permittivity of a material for a [[frequency]] of zero is known as its '''static relative permittivity'''. ...

...aveguide]]s which direct [[electromagnetic wave]]s other than light like [[radio wave]]s. ...IEEE Computer Society|1997}} [[Dielectric waveguide]]s are used at higher radio frequencies, and transparent dielectric waveguides and [[optical fiber]]s s ...

...pagating electromagnetic wave produced (e.g., by a transmitting [[Antenna (radio)|antenna]]), one can still identify as an evanescent field the component of ...espite energy flowing horizontally, along the vertical there is ''no'' net propagation of energy ''away'' from (or toward) the surface, so that one could properly ...

...ign and will be reinforcing each other. One says that [[interference (wave propagation)|constructive interference]] is occurring. At arguments <math>t</math> whe ...tiphase''. Then the signals have opposite signs, and [[interference (wave propagation)|destructive interference]] occurs. ...

[[AM radio]] – [[Amateur radio]] – ...

...system each, there are several independent factors in the time, space, and frequency domains that have to be taken into consideration in order to determine the ...does not know what the environment (also called a [[Communication channel|propagation channel]]) is beforehand, every system operates under the assumption that i ...

...tromagnetic quantities will solely be represented as Fourier's images in [[frequency domain]]. [[Lorenz gauge|Lorenz's gauge]] is used. ...rm{j}</math> being [[imaginary unit]], <math>\omega</math> being [[angular frequency]], <math>\boldsymbol{A}</math> being [[vector potential]] ...

[[Image:Wave group.gif|frame|[[Dispersion (water waves)|Frequency dispersion]] in groups of [[gravity wave]]s on the surface of deep water. T ...Wave packet propagation (phase faster than group, nondispersive).gif|thumb|Propagation of a wave packet demonstrating a phase velocity greater than the group velo ...

...[[wave packet]]'', a "pack" or "group" of oscillations centered around one frequency that travel together, formed for instance by multiplying ([[amplitude modul ...lay across the entire frequency range of a [[bandlimited]] signal and flat frequency response, the waveform will experience no distortion. ...

...''' is a second-order [[partial differential equation]] that describes the propagation of [[electromagnetic wave]]s through a [[Medium (optics)|medium]] or in a [ ...tic field {{math|'''B'''}} are both perpendicular to the direction of wave propagation. ...