June 21, 2021 at 12:30 pmcbiurrunSubscriber
I am facing some issues when trying to use the Fields Calculator in ANSYS Electromagnetics Desktop (HFSS). The version I am using is 2020 R2.4.
I am simulating a standard Grounded Coplanar Waveguide with HFSS. I have two different setups: one being a Driven Modal analysis and the second being an Eigenmode analysis. In the former, I have a Wave Port consisting of a 2D Rectangle. This Wave Port, after Driven Modal simulation, will give me a Zpi impedance. In principle, the impedance given by the simulator is computed from a 2D Eigenmode problem that is solved for the Waveport. I would like to do the same, directly on the Eigenmode simulation setup.
In the Eigenmode simulation, there are no Waveports. I just have Primary and Secondary boundaries on the faces perpendicular to the longitudinal axis (X-axis, in this case) and PEC boundaries on the other faces. With this analysis, I get information regarding several modes propagating in the structure and their complex frequencies for a given phase delay in between the primary-secondary boundaries (namely, a phase constant Betta). I am also generating and saving the fields information of the simulation, therefore I should be able to compute the Zpi impedance of the crosssection of this transmission line (I created a rectangle). I am, however, not very familiar with the use of the Fields Calculator tool and therefore I feel stuck in obtaining this result.
For this impedance, I should get the Power and divide it by the current squared to the power of 2. However, I keep receiving errors when I try to integrate the fields/currents in the geometry of interest.
Could anyone provide some help?June 21, 2021 at 1:57 pmcbiurrunSubscriberFollow up:
I programmed these functions (see file attached) in the Field Calculator for obtaining V, I and P , following the Zpi, Zpv and Zvi impedance definitions found in the HFSS Help. However, for a 50-Ohm CPW I got really strange results (Zvi = 350 Ohm, Zpi=450 -j290 Ohm, Zpv=1.8E17 Ohm), so I guess I am doing something wrong (maybe the equations or maybe the geometries selected).
June 21, 2021 at 4:03 pmcbiurrunSubscriber
I updated the definition of P but still do not get the proper results. Nevertheless, at least I don't get so crazy values.
Now I get:
Zpi: -120 Ohm
Zpv: -20.52 -j33.53 Ohm
Zvi: 60.14 +j33.71 Ohm
I understand that the (-) sign doesn't matter and is probably due to the path of integration. However, the results are still far from the expected (50 Ohm)
July 9, 2021 at 3:12 pmmannyAnsys EmployeeI suspect that is something to do with your geometry. Your formulae look ok. It probably has to do with your integration line and geometry. For more information, please see the Fields Calculator cookbook in the online help.
Viewing 3 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.Trending discussions
- Signing up as ANSYS Support Coordinator
- simulation completed with execution error on server
- How to export Ansys Maxwell simulation results for post-processing in matlab or in .csv file
- Maxwell, HFSS or Q3D?
- Running ANSYS HFSS on the HPC (it runs on Linux only)
- Number of parallel paths in Ansys Maxwell
- Unable to assign correctly the excitations in a coil
- Illegal External Terminal – assigning current to a coil
- Running ANSYS HFSS on multiple nodes on SLURM based cluster
Top Rated Tags
© 2022 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.