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We return now to the parallel-plate transmission line problem that was discussed in the previous chapter in §3.8. As we mentioned before, this is a useful model problem in that it can be simplified to model the transverse motion of a membrane, and (2+1)D linear acoustics. It can be modified in a trivial way to model transverse electric (TE) or transverse magnetic (TM) fields in a substance of spatially-varying dielectric constant, magnetic permeability, and loss characteristics.
The (2+1)D Parallel-plate System