nondirectional antenna
Học thuậtThân thiện
Definition
- Noun:
- An antenna that sends or receives signals equally in all directions: A "nondirectional antenna" is a type of radio antenna designed to radiate or receive electromagnetic waves with roughly equal intensity in all horizontal directions. It does not focus energy in a specific, narrow beam.
Usage
- This term is used in telecommunications, broadcasting, and radio engineering to describe an antenna with an omnidirectional radiation pattern.
- It is often contrasted with a "directional antenna," which focuses energy in a specific direction for greater range or to avoid interference.
Examples
- Noun:
- The radio station uses a tall nondirectional antenna to broadcast its signal across the entire city.
- For general reception of local stations, a simple nondirectional antenna on your roof is sufficient.
- Walkie-talkies typically have built-in nondirectional antennas so users can communicate without pointing the device.
Advanced Usage
- "Omnidirectional antenna": This is a common synonym. While "nondirectional" emphasizes the lack of a specific direction, "omnidirectional" (meaning "all directions") is frequently used in technical contexts.
- The Wi-Fi router is equipped with an omnidirectional antenna to provide coverage throughout the house.
Variants and Related Words
- Omnidirectional antenna (n): A direct synonym for "nondirectional antenna."
- Dipole antenna (n): A common type of simple, nondirectional antenna.
- Directional antenna (n): An antonym; an antenna that sends and receives signals more effectively in one specific direction.
Synonyms
- Omnidirectional antenna: The most direct synonym.
- Isotropic radiator: A theoretical concept of a perfect point source that radiates equally in all directions; used as an ideal reference in antenna engineering.
Related Technical Phrases
- Radiation pattern: The graphical representation of how an antenna radiates energy.
- The nondirectional antenna has a circular radiation pattern on the horizontal plane.
- Gain: A measure of an antenna's ability to direct radio frequency energy. A nondirectional antenna typically has low or no gain compared to a directional one.
Noun
- an antenna that sends or receives signals equally in all directions