Electromagnetic near-field scanner

Electromagnetic near-field scanner could be defined as a measurement system to determine a spatial distribution of an electrical quantity provided by a single or multiple field probes acquired in the near-field region of a device under test possibly accompanied by the associated numerical post-processing methods enabling a conversion of the measured quantity into electromagnetic field.

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Depending on a signal receiver detecting the probe signal, voltage as a function of time or frequency is a typical measured quantity. It should be underlined that as the DUT may be considered any object radiating or storing electromagnetic field energy intentionally or unintentionally, e.g. the antenna radiation excited beyond its resonance frequency. The voltage pattern is usually mapped on planar, cylindrical or spherical geometrical surfaces as a collection of a finite number of spatial samples.

Further reading

(June 2005) [www.iec.ch IEC/TS 61967-3: Integrated circuits - Measurement of electromagnetic emissions, 150 kHz to 1 GHz - Part 3: Measurement of radiated emissions - Surface scan method]. International Electrotechnical Commission. 

Slater, Dan (1991). Near-Field Antenna Measurements. Norwood, MA, USA: Artech House, Inc.. 

Yaghjian, Arthur D. (January 1986). "An Overview of Near-Field Antenna Measurements". IEEE Transactions on Antennas and Propagation AP-34 (1): 30-45.