{"id":301973,"date":"2023-08-17T18:36:17","date_gmt":"2023-08-17T18:36:17","guid":{"rendered":"\/forum\/forums\/topic\/huge-backlobe-from-complete-pec-backed-metasurface-in-3d-radiation-plot\/"},"modified":"2023-08-17T19:03:24","modified_gmt":"2023-08-17T19:03:24","slug":"huge-backlobe-from-complete-pec-backed-metasurface-in-3d-radiation-plot","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/huge-backlobe-from-complete-pec-backed-metasurface-in-3d-radiation-plot\/","title":{"rendered":"Huge backlobe from complete PEC backed metasurface in 3D radiation plot."},"content":{"rendered":"<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/17-08-2023-1692298761-metasurface.png\" alt=\"\">I am trying to simulate a completely PEC backed reflective metasurface with finite number of unit cells. I used incident plane wave (travelling at -z direction) to excite my finite array, which is located in x-y plane. I happen to get most prominent reflection from the back side of the PEC(i.e., along -z direction). However, I expect my reflections from the metasurface only along +z direction\/ along some desired direction, as I have PEC at z=0.<\/p>\n<p>I tried using Open boundaries and FE-BI region for the metasurface with no luck. I also tried illuminating the surface with a horn, where both horn and metasurface were surrounded by FE-BI region. All produced erronious huge backlobe from the metasurface PEC backed ground layer.<\/p>\n<p>kindly suggest how to simulate this situation.<\/p>\n","protected":false},"template":"","class_list":["post-301973","topic","type-topic","status-closed","hentry","topic-tag-2dmaterialsandmetals-1","topic-tag-metamaterials-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to simulate a completely PEC backed reflective metasurface with finite number of unit cells. 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