antenna
Let an agent explain antennas and their types, relay principles, parameters and applications from radio engineering references, describe broadcast, satellite and radar antennas, and distinguish antennas from transmitters, receivers and towers.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain antennas and their types, relay principles, parameters and applications from radio engineering references, describe broadcast, satellite and radar antennas, and distinguish antennas from transmitters, receivers and towers.
A device that converts electric currents into radio waves and radio waves into currents, used for transmitting and receiving in radio, television, mobile, satellite and radar systems, in forms such as dipoles and monopoles including mast radiators for broadcasting, horn antennas and feed horns, parabolic dish antennas, arrays and specialised patterns such as cosecant squared antennas for radar, and the large low-frequency antennas of LORAN stations; antennas are characterised by gain, radiation pattern, bandwidth and polarisation.
What it is for: Radiating and receiving radio waves.
It can be explain principles and types; relay parameters; describe applications; distinguish from related equipment.
Distinguishing features
Reciprocity
Gain and pattern
Frequency dependence
Diverse forms
What it looks like
Rods, wires, dishes, horns, panels or masts.
Physical character
half-wave dipole length: about 0.47 wavelengths
largest single dish: 500 m - FAST in China
mast radiator heights: up to about 600 m
How it is recognised
Device radiating or receiving radio waves
Dipoles, mast radiators, horns and feed horns, parabolic antennas, arrays, cosecant squared antennas, LORAN antennas
A transmitter generates the signal; a tower supports antennas; a cable carries the signal
Related models
is a kind of - in registry terms
radiates - from currents
is connected to - and receivers
is characterised by - and radiation pattern
In practice
Families and kinds
wire antennas such as dipoles and monopoles including mast radiators
aperture antennas such as horns and feed horns
reflector antennas such as parabolic dishes
array and phased array antennas
shaped-beam antennas such as cosecant squared radar antennas
low-frequency antennas such as LORAN station antennas
microstrip and mobile device antennas
Identifiers
IEEE Std 145 definitions of terms for antennas
Standards and regulation
IEEE antenna standards
Spectrum licensing and emission rules
Radiofrequency exposure limits
Aviation obstacle rules for masts
Failure modes and hazards
Mismatch and detuning
RF exposure near high-power antennas
Confusing antennas with towers or transmitters
Also called
+78
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.antenna-animal
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What an antenna is.
Science.
Principle
Principle.
Principle
Principle.
- How does an antenna radiate and receive radio waves, and what does reciprocity mean? definition
- Is the question about an antenna, a transmitter, a tower or a cable? boundary
Types
Types.
Types
Types.
- How do dipoles, mast radiators, horns, parabolic dishes, arrays and cosecant squared antennas differ? definition
- Which entry fits the specific type? action
Design Parameters and design.
Practice.
Parameters
Parameters.
Parameters
Parameters.
- What are gain, radiation pattern, bandwidth, impedance and polarisation, and how are they measured? provenance
- Which references are standard? provenance
Selection
Selection and matching.
Selection
Selection.
- How are antennas selected and matched for a given frequency and application? action
- Which entry fits impedance matching? action
Apply Applications.
Application.
Broadcast
Broadcast and navigation.
Broadcast
Broadcast.
- How are mast radiators and LORAN antennas used in broadcasting and navigation? provenance
- Which sources are cited? provenance
Radar
Radar and satellite.
Radar
Radar.
- How do feed horns, dishes and cosecant squared antennas serve satellite and radar systems? provenance
- Which entry fits the specific application? action
Context History and regulation.
Context.
History
History.
History
History.
- How did antennas develop from Hertz and Marconi to phased arrays? provenance
- Which entry fits the history of radio? action
Regulation
Regulation and safety.
Regulation
Regulation.
- What licensing, exposure and structural rules apply to antennas? provenance
- Which entry fits radiofrequency exposure? action
What the second pass must settle
- Should parabolic antenna and dipole antenna be separate primary entries?
- How should engineering references be linked?
- The registry entry has merged aliases naming types and a station kind; should they be split off?