svarun
Full Member level 5
Hi all,
I am simulating a normal CPW ( No Ground plane ) in CST MWS. I am using open boundaries in all directions. Port size is enough to accomodate the field patter ( 5* height and 3*( Width_center_conductor + 2* Gap)). I get the designed line impedance of 92 Ohm. I notice a curious thing. Background matrerial is "Normal" type with Epsilonr=1 and Mur=1. If I set the backgrouind material -> Surrounding space->Lower Z and upper Z to say 3 mm each. I get the line impedance as 82 Ohm. Again changing these distances alters the line impedance. However such a thing does not happen ( too small variations to note) for a microstrip. How does this surrounding space affect the soultion of wave port in MWS for a CPW ? Thanks for listerning.
-svarun
I am simulating a normal CPW ( No Ground plane ) in CST MWS. I am using open boundaries in all directions. Port size is enough to accomodate the field patter ( 5* height and 3*( Width_center_conductor + 2* Gap)). I get the designed line impedance of 92 Ohm. I notice a curious thing. Background matrerial is "Normal" type with Epsilonr=1 and Mur=1. If I set the backgrouind material -> Surrounding space->Lower Z and upper Z to say 3 mm each. I get the line impedance as 82 Ohm. Again changing these distances alters the line impedance. However such a thing does not happen ( too small variations to note) for a microstrip. How does this surrounding space affect the soultion of wave port in MWS for a CPW ? Thanks for listerning.
-svarun