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hykr

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Posts posted by hykr


  1. Hi JIF,

     

    I have attached a model in which near field and the reflection coefficient are calculated at a distance of 10 wavelengths. Although the round trip phase shift should also be a multiple of 2*pi, there is a 180 degrees phase difference between the near field and the reflection coefficient results. I would greatly appreciate it if you explain its reason. 

     

    Thanks. 

     

     

     

     

     

    reflectarray.rar


  2. Hi JIF,

     

    Thank you for your response. As Johan suggested, selecting the "Calculate only the scattered part of the field" option yields only the reflected field, thus its amplitude is in accordance with the reflection coefficient. However I am more interested in finding the reflection phase but the phase of the reflected field and the phase of the reflection coefficient have different values. The reason of my interest in obtaining the reflection coefficient from the reflected field is to compute the modal components of the reflection coefficient. Since adding transmission/reflection request to the characteristic mode configuration is not supported, utilizing the information of the modal reflected fields seems like the only option for the computation of the modal reflection coefficients. Besides that, although characteristic mode analysis is supported for models with periodic boundary conditions in FEKO 7.0, it is not supported anymore in FEKO 14.0, unless I am missing something. A similar work has also been done in http://ieeexplore.ieee.org/document/7695921/

     

    Thanks.

     

     

     


  3. Hi,

     

    I would like to know how we can relate near field solutions and reflection coefficients in the simulations of periodic structures. When I simulate the Jerusalem cross FSS model in the example guide, near field results above the structure are always greater than the incident field (which is 1 V/m). Moreover, when the reflection coefficients are requested on the plane positioned above the structure where near field results are calculated, there is no correlation between near field results and reflection coefficient results when they are plotted as a function of frequency. Since the reflection coefficient is basically Er/Ei, how should we interpret near field results and Er

     

    Thanks.

     

     

     

     

     

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