@David Ashton: it is a simple setup to generate these plots in a 2D Emag Field Solver. You can download the Student Version of Sonnet (Lite, Version 13) and generate the current distribution plots. Note that many of these solvers require you to manually mesh the (free) space around the conductors with elements and some may need infinite boundary definitions (depending on the solution technique used: finite elements, boundary integrals, etc.)
Dr. MP Divakar
There is an error in the units next to the formula, the depth unit should be "um" (micron). So for, 1 MHz, we should have a skin depth of 0.076mm or 76um... so for example, a 2-mil wide & deep trace conducting at 1-MHz, it will be all of the cross section conducting current.
Good article none-the-less.
Dr. MP Divakar
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.