radiation pattern
C1/C2Technical, Academic
Definition
Meaning
The spatial distribution of electromagnetic radiation emitted from an antenna or other source.
A graphical representation, often a polar or 3D plot, showing the relative strength of radio waves or other energy as a function of direction from the source. In physics, it can also refer to the directional dependence of any wave phenomenon (e.g., sound).
Linguistics
Semantic Notes
This is a highly specialized compound noun, primarily used in physics, telecommunications, and engineering. It typically refers to the property of an *antenna* or *array*. The word 'pattern' here refers to a plotted shape, not a decorative design.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or definitional differences. Spelling: British uses 'radiation pattern'; American uses 'radiation pattern' (identical).
Connotations
Identical technical connotations in both dialects.
Frequency
Identical, extremely low frequency in general discourse; used only in relevant technical fields.
Vocabulary
Collocations
Grammar
Valency Patterns
The [NOUN: antenna] has a [ADJ: directional] radiation pattern.We need to [VERB: measure] the radiation pattern of the [NOUN: source].The radiation pattern [VERB: shows] significant sidelobes.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “There are no idioms for this technical term.”
Usage
Context Usage
Business
Rare; only in technical sales or specification documents for antennas or telecom equipment.
Academic
Common in physics, electrical engineering, and telecommunications research papers and textbooks.
Everyday
Virtually never used.
Technical
The primary domain. Used in antenna design, radio frequency (RF) engineering, radar, and acoustics.
Examples
By Part of Speech
verb
British English
- The antenna was designed to radiate with a specific pattern.
American English
- The array radiates in a complex pattern.
adjective
British English
- The radiation-pattern analysis is crucial.
American English
- We need radiation-pattern data.
Examples
By CEFR Level
- The engineer explained that the antenna's radiation pattern was highly directional.
- Optimising the radiation pattern of the phased array significantly improved the signal-to-noise ratio in the desired sector.
- The paper includes a detailed polar plot of the antenna's measured radiation pattern, showing minimal sidelobe interference.
Learning
Memory Aids
Mnemonic
Think of a lighthouse: its light doesn't shine equally in all directions—it has a specific 'pattern' of 'radiation' (light beams). An antenna's radiation pattern is similar but for radio waves.
Conceptual Metaphor
DIRECTIONAL DISTRIBUTION IS A PATTERN (e.g., a mapped shape like a flower petal or lobe). ENERGY FLOW IS AN ARROW (within the pattern).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- The word 'pattern' here does NOT mean 'узор' (decorative design). Think 'диаграмма направленности' or 'характеристика излучения'. Avoid 'рисунок излучения' or 'модель излучения'.
- Do not confuse with 'radiation therapy' or 'radiation sickness'. It is a technical engineering/physics term.
Common Mistakes
- Using 'radiation design' or 'radiation shape' instead of the fixed term 'radiation pattern'.
- Confusing it with 'diffraction pattern' (which results from interference).
- Pronouncing 'pattern' as /ˈpeɪ.tən/ instead of /ˈpæt.ən/ or /ˈpæt̬.ɚn/.
Practice
Quiz
In which field is the term 'radiation pattern' MOST commonly used?
FAQ
Frequently Asked Questions
No. In this context, 'radiation' refers to the emission of any electromagnetic or acoustic waves (e.g., radio, microwaves, sound), not specifically to ionizing nuclear radiation.
Technically yes, for a directional light source (like an LED or spotlight), but it's highly unusual. The term is overwhelmingly reserved for antennas and RF sources.
Beamwidth is a specific numerical measurement (in degrees) derived from the radiation pattern, describing the angular width of the main lobe where power is above half its maximum.
It determines how the phone's antenna sends and receives signals in different directions, affecting call quality, data speed, and battery life by focusing energy where needed.