Hawaslsh
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Hello all,
I am trying to setup a fairly simple (at least I thought) dielectric waveguide. I wanted to make use of the lattice boundaries to mimic an infinity wide dielectric waveguide. Looking through some HFSS examples it seems lattice boundaries and floquet ports might be the bset options here. But I think I am setting up my problem wrong because I can getting almost no transmission from one end of the waveguide to another. Perhaps some one here can offer some advice.
the problem setup is as above (as a note the dielectric is 1.2mm tall and the width is~ 500mil). On the left is a cross section of the geometry. A silicon slab with PEC on top and bottom. With the intention of making this a repeated structure I applied lattice boundary conditions to the side walls and assigned zero phase different for phi and theta. (Perhaps as a bonus someone can explain what those phase differences mean). I wanted to apply Ewalls to the top of the waveguide but the floquet ports didnt allow it. And i was forced to put a lattice pair on the top and bottom of the wave guide as well.
Below is the simple floquet port assignments. I made sure the a and b vectors where parallel to ensure the modes line up? I limited it to one TE mode on both faces.
I am doing this at fairly low frequencies, 1-10 GHz. This setup yielded a S21 below -200 dB so something is a miss. Any advice to tips would be much appreciated.
Thanks
Sami
I am trying to setup a fairly simple (at least I thought) dielectric waveguide. I wanted to make use of the lattice boundaries to mimic an infinity wide dielectric waveguide. Looking through some HFSS examples it seems lattice boundaries and floquet ports might be the bset options here. But I think I am setting up my problem wrong because I can getting almost no transmission from one end of the waveguide to another. Perhaps some one here can offer some advice.
the problem setup is as above (as a note the dielectric is 1.2mm tall and the width is~ 500mil). On the left is a cross section of the geometry. A silicon slab with PEC on top and bottom. With the intention of making this a repeated structure I applied lattice boundary conditions to the side walls and assigned zero phase different for phi and theta. (Perhaps as a bonus someone can explain what those phase differences mean). I wanted to apply Ewalls to the top of the waveguide but the floquet ports didnt allow it. And i was forced to put a lattice pair on the top and bottom of the wave guide as well.
Below is the simple floquet port assignments. I made sure the a and b vectors where parallel to ensure the modes line up? I limited it to one TE mode on both faces.
I am doing this at fairly low frequencies, 1-10 GHz. This setup yielded a S21 below -200 dB so something is a miss. Any advice to tips would be much appreciated.
Thanks
Sami