![]() Both techniques are still suitable for small or moderate objectes compared with the operating wavelength. HFSS is based on Finite Element method and CST is based on a method which is similar to FDTD. Ansoft HFSS and CST have much better interface which enable te user to include very fine details in the geometery of simulated structure. Both MoM and FDTD are not suitable for large antenna structures like reflector antenna or large antenna arrays. It is also mainly suitable for regular shapes like cylinderical DRA as an example. It is based on combination of specific geometeries. On the other hand ZELAND Fidelty, is based on FDTD analysis. Thus, if the structue is simple like rectangualr or circular, IE3D would be the best. Howeve, the interface of IE3D is not quite suitable to include very fine details on the geomtery of the structure. For exampl ZELAND IE3D is based on MoM solution of integral equation which has an excellent accuracy for frequency domain analysis. ![]() ![]() It depends mainly on the geomtery of the structure and the required accuracy of the solution. ![]()
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