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RF: Emitting planar light from PORT (3D)

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Hello my friends.

I am trying to construct a model where the port is placed along the y,z-axis and emits light in the x-direction.

However, I do not want to just emit light normal to port's surface, ie x-direction, but also at different other angles to the normal of the port surface.

I use the User Defined type of port where I set the electric field to oscillate in the y-axis and a propagation constant to be abs(k).

Do I have to play around with the propagation constant?

Thank you very much.

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