Hi, Doug. That's very interesting. I wonder if there would be a
resonance effect if the gap in the shield were adjacent to the connector
instead of being in the centre of the opposite side.
On 2024-02-06 00:22, doug emcesd.com wrote:
Hi All,
The following three articles and the referenced paper from my website
show that, contrary to popular belief, shielded magnetic field probes
do not work in the near field. The E-field shielding in magnetic field
probes only work in the far field or for fields that are symmetrical
about the center line of the probe. Take a look at the articles:
* June 2008, The Square Shielded Loop - Part 2, Parasitic Coupling
<https://emcesd.com/tt2008/tt060208.htm>
(Electric Field Shielding of Magnetic Loops is Not Always Effective!)
* July 2008, The Square Shielded Loop - Part 3, Parasitic Coupling
Between Unshielded Wire Loops <https://emcesd.com/tt2008/tt070508.htm>
* August 2008, The Square Shielded Loop - Part 4, Coupling to a PCB
<https://emcesd.com/tt2008/tt080108.htm>
(From Shielded and Unshielded Magnetic Loops)
* Signal and Noise Measurement Techniques Using Magnetic Field
Probes <https://emcesd.com/pdf/emc99-w.pdf> *(~600K)*
o (1999 IEEE EMC Symposium paper)
Doug
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John M Woodgate, Rayleigh, Essex UK
Keep trying
-
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