bogdan adamczyk

This s-parameters tutorial consists of two parts: Part I discusses the fundamental background needed to understand the concept of s-parameters; Part II explains the s-parameters use in EMC measurements and testing

This article examines the spread-spectrum frequency dithering technique to reduce the EMI noise from a SMPS.

This column explores the conducted immunity test known as a Bulk Current Injection (BCI) test, according to ISO 11452-4 specification.

This article discusses a practical approach to designing an input filter to the switch-mode power supply (SMPS).

We compare the shielding effectiveness of various solid metallic shields by direct H-field measurements in the near field of the source.

In this article we investigate the frequency behavior of a ceramic capacitor.

Adding a guard trace between PCB traces sounds like a simple crosstalk fix — but grounding it wrong can actually make interference worse, not better. See how capacitive and inductive coupling respond differently to grounding placement, and why one counterintuitive result changes the design approach.

When two circuits share a return path with non-zero impedance, the result is common-impedance coupling — and real EMC problems. This foundations piece breaks down the theory with circuit models, then backs it up with lab measurements showing how ground impedance affects audio, video, and high-current circuits sharing a common return path.

From open fields to shielded enclosures, radiated emissions testing demands precision at every step — this technical deep dive compares OATS and ALSE measurement methods, antenna configurations, and FCC and CISPR compliance limits across a broad frequency spectrum.

The article discusses the behavior of voltage and current waves on a transmission line with different types of loads and explains how to measure the VSWR of an antenna.