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I need to create a homogeneous magnetic field of a certain strength across a 10mm diameter opening of a PCB by using a current track on said PCB around the opening. The signal sent through the conductor track is a microwave signal of about 3 GHz with a variable power. How would I go about achieving the strongest and most homogeneous magnetic field across the area of the opening?

My first thought was just routing the conductor track around the opening and use the magnetic field of the current, but that turned out to be quite power hungry. On the interwebs someone recommended a loop gap resonator but I am inexperienced in antenna design and am not sure where to start. I'm starting to learn ANSYS HFSS but can't get a stable footing with it since I'm lacking reproducible examples to learn.

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  • \$\begingroup\$ Short story; it won't happen (homogeneous). Long story; it won't happen without coils of a radius at infinity. \$\endgroup\$
    – Andy aka
    Aug 18, 2021 at 12:23

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A Helmholtz coil is typically used to produce a uniform magnetic field. You could print two coils on either side of your PCB and use a via to connect them. The magnetic field will be stronger the smaller the coil, so probably design it as small as possible while still be acceptably homogenous in your 10 mm diameter region. https://en.wikipedia.org/wiki/Helmholtz_coil

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