omnidirectional antenna
Học thuậtThân thiện
Definition
- Noun:
- An antenna that sends or receives signals equally in all directions: An "omnidirectional antenna" is a type of radio antenna designed to radiate or receive electromagnetic waves uniformly in all horizontal directions. Its coverage pattern is typically donut-shaped, providing equal signal strength in a 360-degree horizontal plane, though it may have limited vertical coverage.
Usage Examples
- Noun:
- The radio station uses an omnidirectional antenna to broadcast its signal to the entire city.
- For best Wi-Fi coverage throughout the house, we installed an omnidirectional antenna on the router.
- The drone's control system relies on an omnidirectional antenna to maintain a stable connection regardless of its orientation.
Advanced Usage
- Technical Context: In telecommunications, an "omnidirectional antenna" is often contrasted with a "directional antenna," which focuses energy in a specific beam. The omnidirectional pattern is ideal for applications where the transmitter or receiver location is not fixed relative to the antenna.
- Mobile phone base stations often employ omnidirectional antennas to serve users in all surrounding areas.
Variants and Related Words
- Omnidirectional (Adjective): Having the property of being equally effective in all directions.
- The device features omnidirectional microphones to capture sound from the whole room.
- Directional Antenna (Noun): An antenna designed to concentrate its radiation pattern in a specific direction for greater range or to reduce interference.
- Dipole Antenna (Noun): A common type of simple omnidirectional antenna.
Synonyms
- Nondirectional antenna: An antenna without a preferred direction of radiation or reception.
- Isotropic radiator (Theoretical): A hypothetical, ideal point source that radiates equally in all directions; a real "omnidirectional antenna" approximates this pattern in the horizontal plane.
Related Phrases
- Omnidirectional coverage: The area served by an omnidirectional antenna's signal pattern.
- The new tower provides omnidirectional coverage for the emergency service network.
- Omnidirectional gain: A measure of an antenna's effectiveness in all horizontal directions compared to a theoretical isotropic radiator.
Related Idioms
(Note: As a technical term, "omnidirectional antenna" is not commonly used in idiomatic expressions. Its usage is primarily literal and technical.)
Noun
- an antenna that sends or receives signals equally in all directions