Author Topic: Open hardware near-field probes  (Read 2054 times)

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Offline loxodesTopic starter

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Open hardware near-field probes
« on: June 12, 2016, 07:55:43 pm »
I've been lurking around these forums for a few weeks without posting, so I thought I'd share the first-order approximation of near field probes that I built recently: has coupling measurements of the probes above microstrip, They aren't perfect, but seem to work up to about 6 GHz. So far they've been helpful at probing a board that I didn't put enough test points on.. I've never used or seen proper near-field probes before, I welcome any feedback on how to improve the design.

If anyone wants to try replicating or modifying these, the layout assumes the OSH Park 4 layer stackup (; y'all would need to modify the offset stripline for other stackups. The stripline was simulated with the MMTL open source 2.5D EM simulation software (, it could be helpful for tuning this to other board houses.

The h-field probe design was almost copied frominspired by "Study of Magnetic Probes Used in EMI Measurements" (
« Last Edit: June 12, 2016, 09:07:42 pm by loxodes »
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Offline daqq

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Re: Open hardware near-field probes
« Reply #1 on: June 12, 2016, 08:52:54 pm »
Nice work!
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