Every day, more and more objects are getting connected, building local networks and connecting to the Internet. While the development of new connected devices has never been as accessible as it is today, there are still many questions around how to legally bring Internet of Things (IoT) devices to the market. This article aims to clarify the process of … [Read more...]
An Overview of Coax Limiters for use in HF Systems
OVERVIEW Critical communication and instrumentation lines subjected to very high energy RF pulses require RF limiters with exceptionally high pulse power capability. A discussion of a typical high frequency (HF) commercial off the shelf (COTS) limiter manufactured and tested by NexTek is presented to provide insight and understanding of … [Read more...]
Science Fiction from Childhood is Now a Reality. Thank You, EMC.
I grew up in the 90s in a small town in West Virginia. Everybody knew each other, everybody knew each other’s kids, and all of the kids spent time at each other’s houses in the summertime. When the heat and humidity turned oppressive, we’d spend the middle of the day inside, playing video games, listening to music, reading comic books, or trading baseball cards. … [Read more...]
EMC and Reliability in Flex PCB Cables Vs. Cable Assemblies
In military and aerospace systems, interconnect failure isn’t just an inconvenience; it can mean mission failure, equipment loss worth millions of dollars, or in the worst case, loss of life. Every connection between circuit boards represents a potential point of failure that must withstand extreme environmental conditions while maintaining signal integrity and EMC … [Read more...]
How to Not Die in an EMC Lab
There are risks in every work environment: risks to humans, risks to equipment, risks to things you might be testing, and risks to customers’ equipment. Such is the case in an EMC lab, which is typically an ever-changing environment with moving parts, equipment, people, and projects. From day to day, EMI personnel can be working on military equipment worth millions of … [Read more...]
Waveguide Insights: Understanding Rectangular and Double-Ridge Designs for Enhanced RF Systems
OVERVIEW This App-Note provides a thorough examination of rectangular and double-ridge waveguides, highlighting their design, operating principles, advantages, and applications. It details specifications and power-handling considerations essential for RF systems. Waveguides are crucial in microwave engineering, offering low-loss, high-efficiency transmission for … [Read more...]
EMC Immunity Testing: Do You Know Your Failures?
Electromagnetic compatibility (EMC) is the desired condition for electronic devices. In an ideal world, radio-frequency emissions and transient events would not cause failures or disruptions to electronic equipment. But as much as we (and the product manufacturers) wish otherwise, we are not in an ideal world. Radiated emissions, whether intentional from transmitters or … [Read more...]
New eBook: From a Hod to an Odd EM Wave
A Remarkable Journey Through Engineering, Humanity, and History In From a Hod to an Odd EM Wave, David A. Weston invites readers into a vivid, deeply personal memoir that weaves together a lifetime of engineering innovation, global experiences, and unforgettable human encounters. From humble beginnings carrying bricks on a construction site in post-war England to … [Read more...]
IoT Systems with mmWave Sensors
One of the most common applications of Internet of Things (IoT) devices is sensing, followed by transmission of raw data back to a base station or server for storage and further analysis. The most common of these sensing tasks seems to be environmental sensing, such as monitoring gas concentrations, temperature, humidity, etc. These devices are so ubiquitous that they … [Read more...]
Design for Compliance Essentials
INTRODUCTION While unrealistic to discuss all aspects of product design in a single article, I’ll try to describe the most common design issues I find in the hundreds of client products I’ve had a chance to work on. These issues generally include PC board design, cables, shielding, and filtering. More detailed information may be found in the Reference section below. As … [Read more...]
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