Many researchers use the FEKO program for characteristic mode analysis instead of CST microwave studio. Is it related to the numerical technique on which the program is based? or there are other reasons?
Dear Halgurd,
as you surely know, unlike CST which uses FEM, FEKO uses MoM.
Very briefly, for characteristic mode analysis of antennas FEKO is computationally optimal with respect to CST.
I attach a very extensive document that validates the calculation of the charactistic modes in different solvers, including FEKO and CST.
https://arxiv.org/pdf/1702.07037.pdf
Best regards
Miguel
Thank you very much Miguel Ferrando-Rocher for your explanation . one more question related to the CMA. In CST when CMA is applied, it gives an error that lossy metal should not be used. However, usually, the copper metal is lossy which is used in the antenna structure. How we can sort out this problem?
Dear Halgurd,
I would recommend you in that case to use PEC as material. The modes you obtain do not depend on whether the material is lossy, so with a perfect conductor I think it is an equally valid model.
Many thanks for your valuable response, Dear Miguel Ferrando-Rocher. I tested. it is fine with PEC material.
Miguel Ferrando-Rocher
I have a question. If I made the dielectric body lossless, would it affect the mode's results or not?
Thanks in advance
I think so, making the dielectric body lossless could alter the resonant frequencies, radiation patterns, impedance matching, and current distributions associated with the antenna's characteristic modes.
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