![]() ![]() In conclusion, a good designer should be able to use different CAD tools with deep understand of limits of their numerical techniques and modeling interface. The part of FEKO which is based on GTD cannot be replaced by Zeland, HFSS or CST beacuse it is mainly suitable for large strucutures like reflector antennas. FEKO has two main solvers, one is basedon MoM and another based on GTD. However, for complicated geometery, you may find the accuracy od HFSS and CST are much better than IE3D due to the approximations which you have to do in the geometery of the structure. In this case the result of Zeland IE3D is the more accurate result. Thus for regular shapes like rectangular patch antenna you may obtain slight difference between HFSS and Zeland IE3D. The accuracy of Finite Element is slightly less than the accuracy of MoM. Different opetions are found in HFSS, but it is still FD solution. The advantage of CST is that within on run one can obtain the results on a wide band because it starts in time domain and convert the results to FD via Fourier Transform. ![]() 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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