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# intuition for model magnetic field manipultion

#### yefj

Hello , I have the following structure of a resonator as shown below.
It has a magnetic field which is rotating around the axes. .
currently the magnetic field on the substrate is the strongest

My goal to to make the magnetic field on the air side stonger on the outer radius.
Is there a way to do it?Is there some physical intuition i could follow?
Thanks.

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The magnetic fields are directly linked to the currents on the surface of the conductor (\vec{J} ~ \hat{n}\times\vec{H}, etc.).
If you want the magnetic fields strongest on the outer circumference, this is where your currents need to be. It looks like you are going for a narrow-band resonant system, so this should be doable. Perform an eigenmode (or similar) simulation at lower frequencies to find where such a resonant mode exists.

You may need to break physical symmetry to excite such a mode, hopefully this isn't a problem.

Hello, my current density is as shown below.
My magnetic field is flowing around this current.
Could you give me intuitions regarding how changig the shape of resonator will affect the current?
And most importantly how the change in current will affect the magnetic field around it?
Thanks.

It looks like this is a simple "TM10" type half-wave resonance, similar to a patch antenna. If you want currents on the outer edge, I'd suggest rotating the structure 90 degrees with respect to the magnetic field; likely you'll also need to adjust its electrical size.

My other main two suggestions are to:
1. Find other resonant modes of this structure. There may already be one that has similar properties to what you want.
2. Break physical symmetry to couple with various incident magnetic field modes.

The magnetic fields are directly linked to the currents on the surface of the conductor (\vec{J} ~ \hat{n}\times\vec{H}, etc.).
If you want the magnetic fields strongest on the outer circumference, this is where your currents need to be. It looks like you are going for a narrow-band resonant system, so this should be doable. Perform an eigenmode (or similar) simulation at lower frequencies to find where such a resonant mode exists.

You may need to break physical symmetry to excite such a mode, hopefully this isn't a problem.

Hello PlanarMetamaterials,basickly its a Patch.
I need the magnetic field as strong as possible above the patch.
In the situation below the magnetic field is strongest between the patch and gnd.
I want to make the magnetic field above stromnger.
How do you think i should break simetry and what is the physical intuition behind it?