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Antenna (radio)

In radio-frequency engineering, an antenna (American English) or aerial (British English) is a structure used to convert alternating electric currents into radio waves for transmission, and to convert radio waves back into electric currents for reception. It is the interface between radio waves propagating through space and electric currents moving in…

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Component type
Passive
First produced
1898
First produced by
Marconi Company
Invention year
1886
Inventor
Heinrich Hertz

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Overview

Terminology

Reciprocity

Resonant antennas

Characteristics

Effect of ground

Modeling antennas with line equations

Mutual impedance and interaction between antennas

Antenna types

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Antenna (radio)

Nodes184
Edges183
Triples18
Avg. degree1.99
Density0.01087
Components1

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Antenna (radio)

Top relations

Component type · 1
Antenna (radio) → Passive
First produced · 1
Antenna (radio) → 1898
First produced by · 1
Antenna (radio) → Marconi Company
Invention year · 1
Antenna (radio) → 1886
Inventor · 1
Antenna (radio) → Heinrich Hertz

Important terminology Word statistics

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Important terminology

antenna antennas impedance wave radio power line transmission ground elements dipole wavelength gain one used resonant radiation frequency element transmitter

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Antenna (radio)Component typePassive1.00infobox
Antenna (radio)First produced18981.00infobox
Antenna (radio)First produced byMarconi Company1.00infobox
Antenna (radio)Invention year18861.00infobox
Antenna (radio)InventorHeinrich Hertz1.00infobox
the Yagiinstance ofinto an antenna array0.80text
the parabolic reflector or horn antennainstance ofthe other parasitic elements interact with the electromagnetic field in order to realize a highly directional antenna but with a narrow bandwidth.Even greater directionality can…0.80text
the shield of a coaxial cable.An electromagnetic wave refractor in some aperture antennas is a component which due to its shapeinstance ofSuch a structure is normally connected to the return connection of an unbalanced transmission line0.80text
position functions to selectively delay or advance portions of the electromagnetic wavefront passing through itinstance ofSuch a structure is normally connected to the return connection of an unbalanced transmission line0.80text
isolatorsinstance ofbut some microwave antennas use high-tech components0.80text
circulatorsinstance ofbut some microwave antennas use high-tech components0.80text
made of nonreciprocal materials such as ferriteinstance ofbut some microwave antennas use high-tech components0.80text

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