Free EMC Guide
How to Reduce Radiated Emissions
Download our free engineering guide to see where radiated emissions really come from and how to stop them at the PCB and system level, before they turn into failed tests, prototype respins, and schedule slips.
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Radiated emissions are one of the most common reasons products fail EMC testing. Over 70% of products fail to comply with required standards on their first submission, and the root causes almost always trace back to design decisions made before a prototype is ever built: PCB stackup choices, component placement, connector pinouts, and how a metal enclosure is bonded to ground. Most of these failures are entirely preventable. This guide gives hardware engineers a clear, practical view of where radiated emissions come from and what to do about them.
What’s Inside This Guide:
Practical, senior engineer level guidance you can apply at the design stage:
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Where radiated emissions actually originate, and why low-level radiation is normal while excess radiation fails testing
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The two regulatory frameworks that decide pass or fail: FCC Part 15 (Class A and the stricter Class B) in the US, and the EMCD and RED directives with CISPR 32 (EN 55032) in the EU
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Why PCB stackup and ground placement influence radiated emissions more than almost any other design decision
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When a two-layer coplanar-ground board is enough, and the density threshold that forces a move to a four-layer stackup
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How to close current loops in switching circuits so they stop behaving like efficient antennas
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Connector pinout and grounding rules, including how many ground pins low-speed, single-ended, and differential signals each actually need
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Why common-mode noise on cables radiates far more than differential noise, and where to place chokes and EMI filters to suppress it
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How floating heat sinks and ungrounded enclosures turn into antennas, plus the bonding strategy for fast-edge GaN and SiC designs
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The cost curve of fixing radiated emissions across the lifecycle, and why pre-prototype review pays for itself
This is field-tested guidance grounded in the standards that govern EMC compliance, written for engineers who want to get it right the first time.
1. Source: DENPAFLUX, Interference Technology.
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What is this guide about?
It explains where radiated emissions come from in a PCB and a finished product, and what to do about them at both the board and system level. It covers stackup design, current loop closure, connector wiring, common-mode noise, and floating metal.
Who should download this guide?
Hardware design engineers, PCB layout engineers, and engineering leads who want to prevent radiated emissions failures before a prototype reaches the test lab. The practices apply across consumer, industrial, and medical products.
Does the guide replace EMC testing or expert consulting?
No. It helps you design for compliance and avoid the most common radiated emissions failures, but formal testing and, where needed, dedicated expert review remain part of getting a product to market.
What standards and regulations does this guide reference?
FCC Part 15 (Class A and Class B), the EU EMC Directive (2014/30/EU), the Radio Equipment Directive (2014/53/EU), and the harmonized standard CISPR 32 (EN 55032), with notes on stricter requirements for medical, automotive, aerospace, and industrial categories.