near-field
Immediate surrounding region
Near-field describes the region immediately adjacent to a source of waves or signals, where the radiation pattern hasn't yet stabilized into its far-field form.
In acoustics, near-field monitors are speakers designed to be heard from a short distance, typically on a desktop: The studio uses near-field monitors for mixing.
In physics and engineering, near-field effects matter for antennas, microscopy, and wireless power transfer, where proximity changes how energy behaves.
Formal admission process
- couplingJoint between systems
- resonanceAmplified oscillation at natural frequency
- evanescentTending to vanish quickly
- reactiveTending to respond
capacitive · inductive · permeability · permittivity · dielectric · waveguide · shielding · antenna
Close-proximity communication protocol
- RFIDWireless identification via electromagnetic fields
- transponderSignal-activated transmitter
- contactlessRequiring no physical touch
- tap-to-payChip-proximity checkout method
pairing · short-range · reader · tag · smartphone · authentication · mobile-payment · Bluetooth
Engineered composites with unusual properties
- nanoscaleBillionth-meter dimension
- fluorescenceLight emitted after absorption
- microscopyTechnique using powerful lenses
- imagingProducing visual representations
Audio input device
- loudspeakerSound amplification device
- transducerEnergy form converter
- soundwaveTraveling pressure disturbance
- recordingCaptured audio or video
diaphragm · studio · amplitude · resonance · vibration · ultrasound · sonar · echolocation
induction
Formal admission process
- couplingJoint between systems
- resonanceAmplified oscillation at natural frequency
- evanescentTending to vanish quickly
reactive · capacitive · inductive · permeability · permittivity · dielectric · waveguide · shielding · antenna
NFC
Close-proximity communication protocol
- RFIDWireless identification via electromagnetic fields
- transponderSignal-activated transmitter
- contactlessRequiring no physical touch
tap-to-pay · pairing · short-range · reader · tag · smartphone · authentication · mobile-payment · Bluetooth
metamaterials
Engineered composites with unusual properties
- nanoscaleBillionth-meter dimension
- fluorescenceLight emitted after absorption
- microscopyTechnique using powerful lenses
microphone
Audio input device
- loudspeakerSound amplification device
- transducerEnergy form converter
- soundwaveTraveling pressure disturbance
recording · diaphragm · studio · amplitude · resonance · vibration · ultrasound · sonar · echolocation
distance
Space between two points
adjacency · contiguity · locality · neighborhood · zone · region · range · radius · boundary · threshold
- close-rangeclose, adjacent, immediate, vicinity, surrounding
- microscopymicroscope, objective lens, compound microscope, eyepiece, compound microscopes