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Periodic boundary condition plus periodic port results do not match with scattered field simulation with scattering boundary condition
Posted Oct 30, 2017, 1:27 p.m. EDT Ray Optics, RF & Microwave Engineering Version 5.1 0 Replies
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Hello Everyone,
I am designing a periodic reflective structure in RF module of Comsol 5.1. First, I have applied scattered field simulation, where I specified periodic boundary conditions on the sides and scattering boundary condition on the front and back sides.
Then, I have tried full field simulation with periodic boundary conditions on the sides and periodic port on the front side.
But, in terms of reflection/absorption results, I am getting different intensities. Comparing to scattered field simulation, I am getting higher intensity in absorption when I am using periodic ports.
So, should I use periodic port with PML to get equivalent result as scattered field simulation? And, also I have another concern that if the reflected wave polarization does not match with your incident polarization (defining at input port), does preiodic port simulation result give you ambiguous result or not? If I need comprehensive reflected wave magnitude and phase information, which simulation process (scattered field simulation/ full field simulation with port) should I use?
I will really appreciate any suggestions or guidance in this regard.
Thank you, Sharmistha.
Hello Sharmistha Pal
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