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far field

In-Situ Radiated Emission Testing of Large Systems Installations

When it comes to in-situ radiated emission measurements, the combination of near- and far-field measurements is often the best approach. Near-field measurements can help identify the sources of emissions, including individual modules or components and their frequency and amplitude characteristics. This information can then be used for far-field measurements. Far-field measurements involve using antennas to measure the radiated noise, with full‑size antennas recommended for measurements between 30 and 200 MHz.

Far-Field Criterion for Wire‑Type Antennas

This article presents the derivation of the far-field criterion for two fundamental wire-type antennas: electric (or Hertzian) dipole and magnetic dipole.

Near and Far Fields “Simplified” for EMI/EMC

This month's column explains the concept of near and far fields using simple theory and examples.

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