TomTurbo
Newbie
Hi there,
I am currently trying to simulate a reflection problem at a dielectric interface inside a parallel-plate waveguide using HFSS. Unfortunately I haven't found a proper way to define the source(s) to find the reflection coefficient for oblique incidence angles.
The top view of the interface (inside the PPW) is shown below. For normal incidence, I defined two wave ports (shown below) which eventually gave me the reflection coefficient (in terms of S11) that I expected.
But things start to get troubling when I try to simulate the transition for oblique incidence angles. I have though of different models to do this. The first one would be to still use 2 wave ports (see 1), with port 1 at the defined incidence angle and port 2 according to the angle of refraction that is found from Snell's law.
My second thought was to just use port 1 and put a radiation or PML boundary condition (2), since the reflection coefficient is the only parameter I would like to extract.
Unfortunately in both configuration the results seem to be strongly dependent upon the dimensions W and Ld, which I thought should have no impact (this is the case for the 2-port model with normal incidence).
Is there something that I am missing?
A last thought was to use a plane-wave excitation as shown below
However, I think in that case the extraction of the reflection coefficient would be a bit more cumbersome. Perhaps someone has an idea on how this could be done, in particular on how to deal with the incident, scattered and total fields?
Any help would be greatly appreciated
Cheers!
I am currently trying to simulate a reflection problem at a dielectric interface inside a parallel-plate waveguide using HFSS. Unfortunately I haven't found a proper way to define the source(s) to find the reflection coefficient for oblique incidence angles.
The top view of the interface (inside the PPW) is shown below. For normal incidence, I defined two wave ports (shown below) which eventually gave me the reflection coefficient (in terms of S11) that I expected.
But things start to get troubling when I try to simulate the transition for oblique incidence angles. I have though of different models to do this. The first one would be to still use 2 wave ports (see 1), with port 1 at the defined incidence angle and port 2 according to the angle of refraction that is found from Snell's law.
My second thought was to just use port 1 and put a radiation or PML boundary condition (2), since the reflection coefficient is the only parameter I would like to extract.
Unfortunately in both configuration the results seem to be strongly dependent upon the dimensions W and Ld, which I thought should have no impact (this is the case for the 2-port model with normal incidence).
Is there something that I am missing?
A last thought was to use a plane-wave excitation as shown below
However, I think in that case the extraction of the reflection coefficient would be a bit more cumbersome. Perhaps someone has an idea on how this could be done, in particular on how to deal with the incident, scattered and total fields?
Any help would be greatly appreciated
Cheers!