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.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Understand What an antenna is.
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.
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.
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.
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
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.OBJ
- Other names and narrower kinds
- mast radiator, LORAN station, horn antenna, feed horn, parabolic antenna, Cosecant squared antenna, Gregorian antenna, Offset dish antenna, marine stabilised antennas, satellite dish, beam waveguide antenna, Cassegrain antenna
What it is Filled
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.
Why it exists Filled
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.
Distinguishing features Filled
- Reciprocity
- Gain and pattern
- Frequency dependence
- Diverse forms
What robots and AI may and may not do Filled
Must not
- Transmit on frequencies or at power levels the licence does not permit.
- Send anyone up a mast or near a transmitting antenna without the operator's exposure controls in place.
- Set up an antenna to intercept or jam communications it is not authorized to receive.
- Spread unsupported health claims about antennas or dismiss real exposure limits.
Only with a human decision
- Changing the power, frequency or direction of a licensed transmitter.
- Permitting work on a live mast or rooftop installation.
May
- Describe antenna types, gain, polarization and coverage from technical sources.
- Monitor and report the status of antennas the agent is authorized to manage.
Moral aspects Filled
- Radio spectrum is shared; interference can disrupt emergency and aviation communications.
- Climbing and RF exposure near transmitters can injure workers.
Who is affected
- Workers on masts and rooftops
- Other spectrum users
- Residents nearby
Owners Filled
Steward
The licensed operator of the station; the national spectrum regulator issues the licence.
Master systems
- National spectrum licence registers
Links to other meta-models Filled
parent
- Q11653 - registry parent class
related
- electronic component - in registry terms
- radio wave - from currents
- radio transmitter - and receivers
- antenna gain - and radiation pattern
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.antenna
- Wikidata: Q131214 (https://www.wikidata.org/wiki/Q131214)
- IEEE: Std 145 definitions of terms for antennas
Direct properties required Filled
- half-wave dipole length: about 0.47 wavelengths
- largest single dish: 500 m - FAST in China
- mast radiator heights: up to about 600 m
Recognition required Filled
- 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
- Rods, wires, dishes, horns, panels or masts.
Capabilities and actions required Filled
- explain principles and types
- relay parameters
- describe applications
- distinguish from related equipment
Hazards and failure modes required Filled
- Mismatch and detuning
- RF exposure near high-power antennas
- Confusing antennas with towers or transmitters
Standards and interfaces required Filled
- IEEE antenna standards
- Spectrum licensing and emission rules
- Radiofrequency exposure limits
- Aviation obstacle rules for masts
Context of use required Filled
- Radiating and receiving radio waves.
- 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
Sources Filled
- Wikidata item Q131214: antenna - identity and sense of the item
- Wikipedia: Antenna (radio) - general description of the item
Open questions
- 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?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q131214/spec.json