dielectricum
For calibration we used a simple coax-cable. We encountered the problem that it wasn't possible to define the ports and run the simulation unless we built the dielectricum (air/vaccum) as a solid cylinder "made" of vaccum.
Is there a possibility to "tell" HFSS that the spaces between to structures is simply air or vaccum?
Thanks.
D.
You can create an air/vaccum box containing the whole structure.
Regards,
Redi.
thanks a lot.
But how?
D.
You just have to choose Draw Box option and draw a box in which the whole your structure will be inside. Than you have to asign material of this box as air/vaccum.
Regards,
Redi.
thanks, we'll try that.
D.
Also, there is another way to do the same thing. About coaxial cable, you can do this without any air boxes. Just make an inner conductor and dielectric around him (air for instance). Outer conductor is not necesary, because default boundary is metal. For instance simulating waveguide in HF$$ is just by making an air interior of the waveguide.
Greetings,
Redi.
thanks to u all.
We tried creating a box around the coax cable and tried it with only a zylinder of air around the conductor and compared it to the results with a model where we drew all parts (conductor, shield and dielectricum) seperately.
The absolut values of the S-parameters remained constant for the "all part" version and the "conductor and air only" version. But we got different results for the phase values of S11 and S22. And we got totally different values for the "air-box" version.
Any ideas why? The materials, ports, dimensions, solution setup...remained the same.
D.
Hi,
Unfortunately, I cannot tell you why is like that. I am an beginner user of HF$$. Maybe someone more experienced will explain you this. But, for now, I advise you to check the HF$$ examples, which were posted here, maybe you will find there a solution for you.
Link to these examples: http://www.elektroda.pl/eboard/ftopic62599.html
Greetings,
Redi.