The simplified method, and in particular the system base-RF-power determination used in the simplified method equation, only applies to far-field data. Why? Well, as an example, the radiation polar-plot provided by antenna suppliers is far-field data and in no way represents how the field-strength varies with angle close to the antenna.So where exactly is the near-field / … [Read more...]

The Simplified Method of Establishing the RF Power Required by a RF Immunity System Continued...Previously we presented the novel idea that the RF power required by a RF immunity system is a base RF power level (determined entirely by constants), minus the gain of the antenna. The basic principle is shown pictorially in Figure 1. The picture says the system RF power requirement … [Read more...]

Please Note: - This blog entry continues the thinking behind the creation of the AH Systems webinar on selecting antennas for today’s test requirements. Supporting notes on the webinar can be found on the AH Systems website.(Hint - click the ‘Tech Notes’ Tab and simply select the first document listed on the main page itself).In the last entry we introduced a method that … [Read more...]

A.H. Systems recently sponsored an EMC Live webinar on selecting antennas for today’s test requirements in which I introduced a simplified method of establishing the amplifier power required by an above 1GHz RF immunity system. Existing methods, such as slotting numbers into a spreadsheet, do not provide the necessary visualization of the test system behavior, and provide … [Read more...]

Whenever I missed an EMC show I always wished there was some sort of report I could read to get a feel for some of what I missed. To that end, here is one on Santa Clara. I have tried to make it informative and fun for non-attendees and attendees alike.This is a major event with a lot of presentations happening in parallel, and I could only attend a short time, so I apologize … [Read more...]

The Central Texas PresentationThe potential audience stayed away in droves with the result that the number attending the presentation was disappointing. This seems strange when you consider the Central Texas Chapter capture area has two major EMC chamber manufacturers, and that previous presentations I have given attracted a big audience. A lot of pizza was taken home – but … [Read more...]

I apologize for the prolonged absence, my career has taken a new path and the preparation for this took up all my spare time. Things are freeing up once more, so I am glad to say I can now return slowly to blog writing.I actually made the time recently to attend a technical presentation on obtaining wireless device approvals, jointly hosted by the Dallas IEEE EMC Chapter and … [Read more...]

As mentioned in the upcoming article ‘Applying Stealth Technology to EMC Chamber Designs’, and also mentioned during the recent EMC-LIVE webinar ‘Elephants in the TestRoom,’ the intention is to use 3D EM simulation software to explore possible design improvements to today’s under- performing chambers. The article itself is not out yet, but we can make useful progress in the … [Read more...]

On Thursday, Oct. 16, Interference Technology hosted a roundtable during EMC Live - 'Elephants in the Test Room' based on our blog series. Below is additional commentary about testing issues, from our expert panel.PanelTom Mullineaux - Moderator, Consultant and Author Patrick Andre - President, André Consulting, Inc.Fin O'Connor - Defense and Space Consultant and Contractor, … [Read more...]

Welcome back. Before we get started - two updates:-3D EM Software Analysis of the Automotive Emissions Test FixtureThe tutorials in the handbooks are completed (there are quite a few because there is an entire suite of analysis tools). Also done are the ones that are downloaded with the software. With all tutorials, a lot of time is devoted to constructing the models to be … [Read more...]