Current distribution in resonant mode for an anapole resonator

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yefj
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Hello, I am building an anapole resonator as shown below.for wide 50uX25u bridge we have a current going into two separated streams on the sides of the bridge.

but as the bridge gets thinner the current is much more homogeneos(and so is the magnetic field) over this bridge as shown below
How can I make on this resonance the current (magnetic field be more homogeneous over the bridge.
I have made also a video shown below. Is there a way to make the current centerend in the middle?
Thanks.

2025-07-16 12-59-00.mkv
1752661595480.webp
1752660670620.webp

1752661579760.webp