The Joint Spectrum Center (part of DISA for those of you who support the US DoD) sponsors and populates the premier electromagnetic environmental effects and spectrum supportability web site on the World Wide Web.We in the business know that compliance with Spectrum Supportability (SS) requirements and control of electromagnetic environmental effects (E3) can be critical … [Read more...]
The Ground Loop
Several readers have made comments regarding multipoint grounding (MPG) systems. The concern is that this arrangement creates multiple ground loops. As a result, we need to address that. As some of you know, I make a lot of presentations and teach a lot of EMC seminars. A long, long time ago, I was discussing ground loops in one of my training classes … [Read more...]
Do You Feel Lucky?
Do You Feel Lucky? Well do ya…..PUNK?Classic line from a classic movie, Dirty Harry, who was also in the Enforcer. Frankly I forget which one came first. So who is our enforcer of electromagnetic environmental effects (E3) requirements, specifically for US DoD program? The requirement to field electromagnetically compatible systems is mandated in DoD … [Read more...]
Can an Ordinary Human Stop RF Noise?
When my son was working on his EE degree he found an article titled: Stop That Noise in the IEEE Potentials, October - November 1995. Being a dutiful son, he brought it home to his EMC-dad and I read it. It is a great little article giving an overview of the cause and effect of EMC problems. The articles primary thrust is to introduce EMC to college students and encourage them … [Read more...]
Where are the Resumes?
Sometimes it’s a bit of a struggle to come up with something relevant to write. I try to write about topical subjects in EMC or spectrum supportability, but sometimes things are just slow. Right now we’re trying to hire a RF Spectrum engineers for some Navy work and it's just hard to find quality resumes. I started wondering why, and I’ve concluded it’s a combination of high … [Read more...]
Let’s Twist Again
Some time ago I introduced the equation for DM radiation from a loop. I also let Howard Johnson make fun of the single ended crowd that do not believe in loops by quoting from one of his articles. (Refer to “Why Digital Engineers Don’t Believe in EMC”, IEEE EMC Society Newsletter, Spring 1998.) The whole article is available on the internet.Anyway, to continue:E = … [Read more...]
The Hybrid Ground System
We’ve already concluded that for low frequencies the Star or SPG ground works best and at the high frequencies, the so-called equipotential ground plane with a MPG system works best. No one grounding system is perfect. On top of that, most of the equipment these days operates at frequencies from DC to daylight, so the grounding design has to cover all frequencies … [Read more...]
Filter Capacitor Selection Criteria for Linear Voltage Regulator Applications
Author Steven Weir Abstract While voltage regulator vendors often suggest generic filter capacitors for use with their devices, these recommendations are often both vague and fail to take into account the effects of the larger PDN bypass network on VRM response. Filter Capacitor Networks Figure 1 depicts a generic PDN conceptual model. Moving from left … [Read more...]
Simulation of GHz Insertion Loss Components; Cross-Section Geometry Influence on Conductor Loss
Tracey Vincent Application Engineer, CST ABSTRACT To attain realistic estimations of simulated insertion loss, all insertion loss components need to be considered and accounted for. In particular, the dielectric and conductor loss components can require careful material parametrization in order for 3D simulated loss to be realistic. An overview of these parametrizations is … [Read more...]
The Electromagnetic “Triple Threat” and the Critical Infrastructures Revisited
Author Dr. William A. Radasky, Ph.D., P.E.; wradasky@aol.com; Metatech Corporation Introduction In 2009 this author first used the term “triple threat” to describe three severe electromagnetic (EM) threats and the protection methods available to protect commercial installations from the high-altitude electromagnetic pulse (HEMP) produced from a nuclear detonation in space, the … [Read more...]
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