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Photonic Band Gap (PBG) crystals are made of two different dielectric materials with a periodicity in one, two or three dimensions, which prevent the propagation of the electomagnetic waves (lights) in specified frequency bands. To develop this concept for microwaves and mm-waves...
No matter which method is used, the key to satisfying results is drawing your structure correctly and setting the right boundary conditions. How ever, according to my experience, if I were you I prefer FEM for structure 1 and FDTD/FIM for structure 2.
Generally, the frequency domain methods (MOM/FEM) lead accurate results, but they are time consuming. The time domain methods (FDTD/FIM/TLM) cost much less calculating time, while they can not guarantee the accuracy when analyzing some irregular or complex geometries. The choice of the...
The 1st structure is a PBG crystal. The 2nd one is a frequency selective surface with dielectric layers. These periodic structures have been analyzed using MOM (Mittra, PSU), FDTD (Samii, UCLA), FEM(Volakis, UMich), or TLM (Parker, Kent). The related papers can be easily found in IEEE Trans. AP/MTT.
Could you describe your structures more clearly? Is it a PBG or a FSS? From my point of view, FEM is suitable to PBG, while MoM is a good choice for FSS. Ansoft HFSS and Designer(Ensemble) are ideal to get Tx/Rx. FEMLAB is powerful in eigenmode analysis. BTW, although I have never used CST MWS...
Re: finite substrate
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.
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