Plane Wave Radiation

The is a class of nonreflecting boundary conditions, which assume that there is an outgoing plane wave, and optionally also an incoming exciting wave.

For transient analysis the boundary condition is

while the corresponding time-harmonic equation reads

Specify an Incident Velocity Potential (incoming plane wave)

by supplying its amplitude,

, and propagation wave direction vector, ek. The vector nk is the normalized wave direction vector of unit length.


	This boundary condition is most relevant for ports, because many waveguide structures are only interesting in the plane-wave region.