oby
Newbie level 6
Hi Guys,
I am working on cpw and microstrip lines with HFSS.
I am tryimg to visualize the losses I can have along my transmission line in the form of surface waves.
I better explain, I know that along my transmission line, because of a thick substrate, I lose some power in the substrate (GaAs).
Defining multi-mode ports does not help since it gives me just the cut-off frequencies of the possible propagation modes from the ports. I already checked my propagation constant, and they are out of band.
But I still lose power along the transmission line, this has been double checked from a proper measurement on a real chip.
I am sure that there are some modes excited along the structure as evanescent....and some surface mode generation.
Have you got any idea opn how to identify and visualize them??
I hope there is someone out there who can enlight me.
best regards
oby
I am working on cpw and microstrip lines with HFSS.
I am tryimg to visualize the losses I can have along my transmission line in the form of surface waves.
I better explain, I know that along my transmission line, because of a thick substrate, I lose some power in the substrate (GaAs).
Defining multi-mode ports does not help since it gives me just the cut-off frequencies of the possible propagation modes from the ports. I already checked my propagation constant, and they are out of band.
But I still lose power along the transmission line, this has been double checked from a proper measurement on a real chip.
I am sure that there are some modes excited along the structure as evanescent....and some surface mode generation.
Have you got any idea opn how to identify and visualize them??
I hope there is someone out there who can enlight me.
best regards
oby
