67 relations: Air traffic control, Antenna (radio), Antenna aperture, Antenna boresight, Antenna gain, Bandwidth (signal processing), Beamwidth, C band (IEEE), Cellular network, Coaxial cable, Communications satellite, Diathermy, Dielectric heating, Dipole antenna, Directional antenna, Extremely high frequency, F band (NATO), Fresnel zone, G band (NATO), H band (NATO), Hertz, Horn antenna, Hyperthermia, I band (NATO), Integrated circuit, International Telecommunication Union, J band (NATO), K band (IEEE), K band (NATO), Ka band, Knife-edge effect, Ku band, Line-of-sight propagation, Luneburg lens, Marine radar, Metre, Microwave, Microwave burn, Microwave oven, Microwave transmission, Mobile phone, Monopole antenna, Omnidirectional antenna, Parabolic antenna, Patch antenna, Phase shift module, Phased array, Point-to-point (telecommunications), Radar, Radio frequency, ..., Radio spectrum, Radome, Refraction, RF front end, S band, Signal processing, Skywave, Slot antenna, Surface wave, Transmission line, Tropopause, Troposphere, Tropospheric scatter, Waveguide (electromagnetism), Wavelength, Wireless LAN, X band. Expand index (17 more) » « Shrink index
Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through controlled airspace, and can provide advisory services to aircraft in non-controlled airspace.
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
In electromagnetics and antenna theory, antenna aperture, effective area, or receiving cross section, is a measure of how effective an antenna is at receiving the power of electromagnetic radiation (such as radio waves).
In telecommunications and radar engineering, antenna boresight is the axis of maximum gain (maximum radiated power) of a directional antenna.
In electromagnetics, an antenna's power gain or simply gain is a key performance number which combines the antenna's directivity and electrical efficiency.
Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.
In a radio antenna pattern, the half power beam width is the angle between the half-power (-3 dB) points of the main lobe, when referenced to the peak effective radiated power of the main lobe.
The C-band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz); however, this definition is the one used by radar manufacturers and users, not necessarily by microwave radio telecommunications users.
A cellular network or mobile network is a communication network where the last link is wireless.
Cross-sectional view of a coaxial cable Coaxial cable, or coax (pronounced), is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.
A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
Diathermy is electrically induced heat or the use of high-frequency electromagnetic currents as a form of physical or occupational therapy and in surgical procedures.
Dielectric heating, also known as electronic heating, RF (radio frequency) heating, and high-frequency heating, is the process in which a radio frequency alternating electric field, or radio wave or microwave electromagnetic radiation heats a dielectric material.
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
A directional antenna or beam antenna is an antenna which radiates or receives greater power in specific directions allowing increased performance and reduced interference from unwanted sources.
Extremely high frequency (EHF) is the International Telecommunication Union (ITU) designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz).
The NATO F band is the obsolete designation given to the radio frequencies from 3 000 to 4 000 MHz (equivalent to wavelengths between 10 and 7.5 cm) during the cold war period.
A Fresnel zone, named for physicist Augustin-Jean Fresnel, is one of a series of concentric prolate ellipsoidal regions of space between and around a transmitting antenna and a receiving antenna system.
The NATO G band is the obsolete designation given to the radio frequencies from 4 000 to 6 000 MHz (equivalent to wavelengths between 7.5 and 5 cm) during the cold war period.
The NATO H band is the obsolete designation given to the radio frequencies from 6 000 to 8 000 MHz (equivalent to wavelengths between 5 and 3.75 cm) during the cold war period.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam.
Hyperthermia is elevated body temperature due to failed thermoregulation that occurs when a body produces or absorbs more heat than it dissipates.
The NATO I band is the obsolete designation given to the radio frequencies from 8 000 to 10 000 MHz (equivalent to wavelengths between 3.75 and 3 cm) during the Cold War period.
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, normally silicon.
The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.
The NATO J band is the obsolete designation given to the radio frequencies from 10 to 20 GHz (equivalent to wavelengths between 3 and 1.5 cm) during the cold war period.
The IEEE K band is a portion of the radio spectrum in the microwave range of frequencies from 18 to 27 gigahertz (GHz).
The NATO K band is the obsolete designation given to the radio frequencies from 20 to 40 GHz (equivalent to wavelengths between 1.5 and 0.75 cm) during the cold war period.
The Ka band (pronounced as either "kay-ay band" or "ka band") is a portion of the microwave part of the electromagnetic spectrum defined as frequencies in the range 26.5–40 gigahertz (GHz), i.e. wavelengths from slightly over one centimeter down to 7.5 millimeters.
In electromagnetic wave propagation, the knife-edge effect or edge diffraction is a redirection by diffraction of a portion of the incident radiation that strikes a well-defined obstacle such as a mountain range or the edge of a building.
The Ku band is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz).
Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves travel in a direct path from the source to the receiver.
A Luneburg lens (originally Lüneburg lens, often incorrectly spelled Luneberg lens) is a spherically symmetric gradient-index lens.
Marine radars are X band or S band radars on ships, used to detect other ships and land obstacles, to provide bearing and distance for collision avoidance and navigation at sea.
The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI).
Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.
Microwave burns are burn injuries caused by thermal effects of microwave radiation absorbed in a living organism.
A microwave oven (also commonly referred to as a microwave) is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range.
Microwave transmission is the transmission of information or energy by microwave radio waves.
A mobile phone, known as a cell phone in North America, is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane.
In radio communication, an omnidirectional antenna is a class of antenna which have an axis about which radio wave power is radiated symmetrically, and, upon that axis, is zero.
A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves.
A patch antenna is a type of radio antenna with a low profile, which can be mounted on a flat surface.
A phase shift module is a microwave network module which provides a controllable phase shift of the RF signal.
In antenna theory, a phased array usually means an electronically scanned array; a computer-controlled array of antennas which creates a beam of radio waves which can be electronically steered to point in different directions, without moving the antennas.
In telecommunications, a point-to-point connection refers to a communications connection between two Communication endpoints or nodes.
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3 000 GHz (3 THz).
A radome (which is a portmanteau of radar and dome) is a structural, weatherproof enclosure that protects a radar antenna.
Refraction is the change in direction of wave propagation due to a change in its transmission medium.
In a radio receiver circuit, the RF front end is a generic term for all the circuitry between the antenna up to and including the mixer stage.
The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz).
Signal processing concerns the analysis, synthesis, and modification of signals, which are broadly defined as functions conveying "information about the behavior or attributes of some phenomenon", such as sound, images, and biological measurements.
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
A slot antenna consists of a metal surface, usually a flat plate, with one or more holes or slots cut out.
In physics, a surface wave is a mechanical wave that propagates along the interface between differing media.
In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to conduct alternating current of radio frequency, that is, currents with a frequency high enough that their wave nature must be taken into account.
The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere.
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place.
Tropospheric scatter (also known as troposcatter) is a method of communicating with microwave radio signals over considerable distances – often up to, and further depending on terrain and climate factors.
In electromagnetics and communications engineering, the term waveguide may refer to any linear structure that conveys electromagnetic waves between its endpoints.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
A wireless local area network (WLAN) is a wireless computer network that links two or more devices using wireless communication within a limited area such as a home, school, computer laboratory, or office building.
The X band is the designation for a band of frequencies in the microwave radio region of the electromagnetic spectrum.