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MIL-HDBK-419A Plane Wave Field.
The EM field at a distance of more than a few wavelengths from its source is essentially a plane wave with a
wave impedance equal to the intrinsic impedance of the propagation media (377
for air). A plane wave has its
electric field and magnetic field vectors,
perpendicular both to each other and to the direction of
Unlike the low- and high-impedance fields associated with the near-fields of magnetic dipole and electric
dipole sources, the plane wave field reflection loss is independent of the distance between the source and shield.
The reflection loss for a plane wave impinging upon a uniform shield is given by
Figure 8-6. Universal Reflection Loss Curve for a Low Impedance Source (8-3)


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