toonafishy said:I just finished a microstrip balun design and simulated it in M/W/O/(2.5D) and H/F/S/S (3D). The results were similar but not exactly the same. which got me thinking. In you experience, which 2.5D simulator results most closely matched your lab measurements of the final circuit. I'm thinking of M/W/O, S/o/n/n/e/t, Mo/m/e/n/t/u/m, E/n/s/e/m/b/l/e, etc. When I build it in the lab, I'll let you know how closely the results matched the sims.
Even with HFSS, the result is also not very satisfactory but compared to the others, it is better. The HFSS fails to allow good description on the radiation pattern.
If you are modeling only 2.5D structure, you may try the Ansoft Designer - Planar EM, it has new functions specially for periodic structures, and also frequency sweep. That is a great feature for designing FSS/PBG. I have simulated some FSS structures, the results are perfect.JoeSchmo said:Actually, if you are using periodic boundaries, HFSS is very accurate. The only problem is that for a full radiation pattern you need to do a solve for every scan point and frequency. This method, though tedious, was verified by measurement for a notch element in both Co and X-pol patterns.
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