radiation pattern
Definition
Noun: A graphical representation, typically in polar or Cartesian coordinates, showing how the intensity of electromagnetic radiation (or sound waves) from a source, such as an antenna or loudspeaker, varies with direction. It visually depicts the directional dependence of the strength of the waves emitted.
Usage
This term is used primarily in technical fields like electrical engineering, telecommunications, acoustics, and physics. It describes a specific type of diagram or plot.
Examples
- The engineer analyzed the radiation pattern to optimize the antenna's coverage area.
- A dipole antenna has a characteristic figure-eight radiation pattern.
- The radiation pattern showed strong lobes in the horizontal direction and nulls at certain angles.
Advanced Usage
- Beamwidth: Often discussed in relation to a radiation pattern, it is the angular width of the main lobe where the power is above half its maximum value.
- Side Lobes/Back Lobes: Parts of the radiation pattern where energy is radiated in undesired directions. Minimizing these is a key goal in antenna design.
- Isotropic Pattern: A theoretical radiation pattern that is uniform in all directions, often used as a reference point.
Variants and Related Words
- Antenna Pattern: A common synonym for radiation pattern.
- Directivity Pattern: Emphasizes the directional characteristics of the source.
- Polar Diagram: Refers to the specific type of graph (polar coordinates) often used to plot the pattern.
- Lobe: A part of the radiation pattern representing a region of radiation in a particular direction (e.g., main lobe, side lobe).
Synonyms
- Antenna pattern
- Directivity pattern
- Field pattern
Related Phrases
- To plot a radiation pattern: To create the graphical representation.
- To measure a radiation pattern: To empirically determine the pattern using test equipment.
- Omnidirectional pattern: A pattern with nearly equal radiation in all directions in a given plane (e.g., horizontal).
- Directional pattern: A pattern focused in a particular direction.
Noun
-
graphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angle
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