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Surface Current Density Comsol 4.4

Posted Feb 26, 2019, 4:36 p.m. EST Electromagnetics, Low-Frequency Electromagnetics, RF & Microwave Engineering Version 4.4 1 Reply

Jose Santos
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Hello,

I would like to know what is the difference between induced Current Density (emw.Jix), Surface Current Density (emw.Jsx), and Current Density (emw.Jx).

Thanks in advance, Jose Santos.

1 Reply Last Post Mar 16, 2019, 2:24 p.m. EDT
Robert Koslover Certified Consultant
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Posted: 6 years ago Mar 16, 2019, 2:24 p.m. EDT

I'll tackle two of those. emw.Jx is the x component of the volume current density in the x-direction, so it is in units of A/m^2. Use it for materials with non-zero and non-infinite conductivity. emw.Jsx is the x component of the surface current density, so it is in units of A/m. I use if most often to look at surface currents on perfect conductors (PECs), but I think (I haven't checked, but you could check fairly easily) you could also use it on a surface that was specified with an impedance boundary condition.

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Scientific Applications & Research Associates (SARA) Inc.
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I'll tackle two of those. emw.Jx is the x component of the volume current density in the x-direction, so it is in units of A/m^2. Use it for materials with non-zero and non-infinite conductivity. emw.Jsx is the x component of the surface current density, so it is in units of A/m. I use if most often to look at surface currents on perfect conductors (PECs), but I think (I haven't checked, but you could check fairly easily) you could also use it on a surface that was specified with an impedance boundary condition.

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