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Near-Field vs Far-Field

Engineering reference on Near-Field vs Far-Field for wireless power system design, integration, and deployment.

6 minArticle 10/16Fundamentals

Near-Field vs Far-Field — educational diagram — Fig.: Educational diagram for “Near-Field vs Far-Field”.

Near-field wireless power operates in the reactive zone close to the transmitter — inductive, resonant magnetic, or capacitive interfaces. Far-field systems radiate propagating waves. The boundary is physical, not marketing: it changes efficiency curves, safety analysis, and product architecture.

01Quick comparison

Near-field: short gap, high potential efficiency, pad/dock form factors, strong industrial traction.
Far-field: longer distance, lower power density at the receiver, beam/antenna design dominates.
Near-field EMI is mostly magnetic/electric local fields; far-field adds radiated RF compliance complexity.
Docking robots → near-field. Remote ultra-low-power sensors → often far-field RF.

Near-Field vs Far-Field — supporting diagram — Fig.: Supporting illustration for “Near-Field vs Far-Field”.

02Choosing for a project

If the vehicle can present a coil to a pad within a controlled gap and alignment window, near-field magnetic WPT is usually the engineering default. If the device cannot dock and only needs microwatts to milliwatts, far-field RF harvesting may win. Mixing the two in one product is uncommon; mixing them in one facility is normal.