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This will happen if you're trying to simulate an electrically large model. A few possible solutions:
-If you're doing a frequency sweep, look at a lower top end - change your range so you're not simulating as high of frequencies
-If possible, use PEC instead of finite conductors - depends on...
Read:
Veselago's paper from the 1960s in Soviet Physics Usbekhi (sp)
Pendry's paper from ~2001 "Negative refraction makes a perfect lens"
Any of the papers in Science from D.R. Smith and/or J.B. Pendry and/or X. Zhang since 2000 including especially:
-the 2006 cloaking paper
-the ~2006...
Along the lines of the previous post, CST gives you more control over meshing. It's easier to do finer/variable meshing for particular parts of the model than in HFSS. Of course, you have to know what you're doing sometimes - from experience, using a stripline feed not quite aligned with other...
Without running the simulation, your adaptive solution frequency needs to be the upper end of your sweep range at minimum. This is a big problem. Your mesh isn't fine enough for the upper end of frequencies, or really anything much above 1.2 GHz. When I changed the solution frequency to 10GHz...
You're misunderstanding gain. Antenna gain is simply gain compared to an isotropic antenna, not power gain. Antennas are not active devices. Balanis' antenna book gives specific, detailed definitions of antenna gain. Since antennas are not active devices, an antenna radiating 1W always radiates...
Mordakhay, the answer is in the Robust paper (Chen). Enforce continuity of real(n). That also describes how to choose the branch at a particular point, which is all you need then.
bzai, I'm not sure how to do it in CST. I can tell you how to de-embed in HFSS or describe what the concept is but...
Please upload. HFSS is very, very dependable if you truly know what you're doing with it. Without the project, sounds like it's not truly converged. How many consecutive converged passes do you require? It should be more than 1.
Read some of those papers? The fourth from the top, the Robust one by Chen et al, is one of the best. Begin with that and actually read the references listed in it. This is pretty well-understood and straightforward.
Yes. HFSS is around 50-70k I believe without university discount. I do not believe that includes all the possible modules like running on multiple CPUs.
Ever used HFSS for a decent-sized project? My 2GB RAM PC has crashed after 20 iterations on smaller models, let alone 100. Use symmetry, reduce size if possible. Do you really need over 100 mesh refinements? What's your convergence criterion?
For the example of differentiation/integration, if the operators are independent of each other. IE if you have a mixed operator on both x and y and another mixed operator, I don't believe you can interchange them. Rigorously, I'm not sure. I'd ask a math professor for the general rules.
ADS is really commonly used. Depends what part you want - more on the EM/antenna side just use any standard EM tool like HFSS/CST MWS, etc. If you're looking more at the circuit level use ADS and momentum, get some good nonlinear simulation performance there.
e_m_c is correct. Depends if you need multiple types of physics simulated (Comsol), if you can use 2 or 2.5 dimension vs. full 3D, what frequency range (HFSS not good for optics and such), etc. Comsol, HFSS, CST Microwave Studio are all standard full 3D simulators. If you want more circuit...
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