Helmholtz Coil Simulation

[Swoopoo]

Hello,

how would one start with simulating helmholtz coils at 2.87 GHz in HFSS? I couldn't find any material online. Can you approximate the current * windings as the current through a single loop? Is there a way to excite lumped ports with a current instead of a voltage or do I have to calculate a voltage at the inductor ports in order to excite the coil with a desired current?

Thanks

 

[PlanarMetamaterials]

I'm not sure about the loop, but yes, you can excite current sources on a surface between the two terminals. HFSS->Excitations->Assign->Current

 

[FvM]

A Helmholtz coil is a magnetostatic device, operating at DC or low frequencies. The current in all windings is in phase and capacitive effects can be ignored.

At microwave frequency, the current in individual windings is phase shifted due to finite propagation speed and also affected by interwinding capacitance. You need to model the actual winding geometrie to get a realistic current distribution and field picture of the coil, which is quite different from a single loop.

 

[Swoopoo]

Unfortunately, at the targeted frequencies the impedance of the coils becomes so large, that a resonance circuit would be necessary with a capacitor in the femto farad region with a voltage rating that is practically not feasible. Thanks anyway!

--- Updated Aug 26, 2021 ---

I'm not sure about the loop, but yes, you can excite current sources on a surface between the two terminals. HFSS->Excitations->Assign->Current

Unfortunately not. I can only assign voltages (lumped ports) or power in watts (waveport).