{"id":368358,"date":"2024-05-23T17:09:39","date_gmt":"2024-05-23T17:09:39","guid":{"rendered":"\/forum\/forums\/topic\/material-loss-in-metamaterials-using-passivity\/"},"modified":"2024-05-23T17:09:39","modified_gmt":"2024-05-23T17:09:39","slug":"material-loss-in-metamaterials-using-passivity","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/material-loss-in-metamaterials-using-passivity\/","title":{"rendered":"Material loss in metamaterials using passivity"},"content":{"rendered":"<p dir=\"ltr\">Hi all I just need help understanding material loss in my metamaterial. From what I understand, in order to take into account the material loss in my metamaterial a passivity plot as a function of frequency should show how much material loss I am experiencing at every frequency. When I plot a function of the magnitude of the passivity vs frequency the passivity is around 0.99-0.97 which seems quite high&#8230; So I am not exactly sure how to interpret this.<\/p>\n<p dir=\"ltr\">Ultimately I want to know the radiation loss that my metamaterial is experiencing. The way that I am calculating this is through the S-parameters (ie the reflection and transmission). Using conservation of energy 1 = S11 + S21. Since there will be some loss due to radiation loss and material loss I will have a total loss. Thus the equation changes to 1 = S11 + S21 + Total_loss. The total loss should be equal to the radiation loss and the material loss. Thus that is why I need to know the material loss in order to calculate the radiation loss.<\/p>\n<p dir=\"ltr\">I have already been able to calculate the total loss which is a small fraction of 1. But if I were to look at the passivity the magnitude is much greater than my total loss. That is why I am confused about how to interpret the magnitude of the passivity when looking at it as a function of frequency.<\/p>\n<p>Plot for passivity:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/23-05-2024-1716484024-mceclip0.png\"><\/p>\n<p>&nbsp;<\/p>\n<p>Plot for S-paramters reflection and tranission:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/23-05-2024-1716484094-mceclip1.png\"><\/p>\n","protected":false},"template":"","class_list":["post-368358","topic","type-topic","status-closed","hentry","topic-tag-loss-1","topic-tag-losses","topic-tag-metamaterial-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all I just need help understanding material loss in my metamaterial. 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