6 reasons TEM mode cannot exist in parallel planar waveguides
TEM mode requires two conductors with independent E/H fields, but parallel plates lack a closed current path, forcing quasi-TEM (fringing fields). Cutoff frequency limitations (fc=0 for TEM) conflict with waveguide dispersion, while boundary conditions only support TM/TE modes (m,n≥1). Field solutions demand non-zero kz, impossible with TEM’s transverse-only propagation. Single-conductor confinement prevents static-like field distribution, […]
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