October 21, 2021 at 4:10 pmjxx89Subscriber
I just downloaded the online example of a Coaxial-fed patch antenna (https://support.lumerical.com/hc/en-us/articles/360042538213), and simulated the file without doing any modification. After the simulation is done, and running the 'rectangular_patch.lsf' script, however, I found that the generated plots are completely wrong. For example, the reflection loss, and near field power are all zero across the whole frequency range. And in the directivity plot, only the curve for theoretical results appear (no simulated data). It seems to me that there is no energy input at all... However, since I download the file from Lumerical website and did not make change to it, I don't know what happened (Please see these Figs that I generated)November 30, 2021 at 9:12 pmjxx89SubscriberCan anyone help me on this... I myself really cannot figure it out...
December 13, 2021 at 8:16 pmTaylor RobertsonAnsys Employee
There was a problem with how the object was being etched. I've updated the fsp file on the support website you linked. Please redownload the file and rerun, you should get the correct results now.
I am not sure if the meshing behavior changed at some point, this note seems correct; however, the simulation set-up was not.
Essentially 2D objects can only etch other 2D, and will always take priority over 3D objects. For this reason there was a perfect PEC, the ground plane, serving as cap over the end of the coax that was distorting the results. If we add a ground plane polygon to etch, we get the results we expect. You can see the difference in the surface conductivity.
Best RegardsDecember 13, 2021 at 8:50 pmjxx89SubscriberThank you so much! I am working on it now!
December 14, 2021 at 12:35 amGuilin SunAnsys EmployeeThank you fixing this issue.
xjw19960228 later on please write any post in Photonics Forum related to Lumerical products. Do not communicate inside this post as it has no proper forum associated with it. Thank you!
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