near field

Before you can calculate shielding effectiveness, you need to know whether your material qualifies as a good conductor — and that's where loss tangent comes in. This deep dive connects the math to the physics, from plane wave propagation to practical near- and far-field shielding formulas.

Three real-world case studies show how RF power amplifiers and creative benchtop setups solve complex radiated immunity failures in hours instead of weeks. From military-grade testing to runaway medical motors, discover techniques that save time and money while identifying root causes traditional methods miss.

This article discusses the ongoing revision of IEEE Standard 1720, which provides recommended practices for near-field antenna measurements. It outlines the update process, key changes in various clauses, and new additions to the standard, including improved guidance on anechoic chamber design and non-regular scanning techniques. The revised standard is expected to be published in early 2025.

When it comes to in-situ radiated emission measurements, the combination of near- and far-field measurements is often the best approach.

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