{"id":319858,"date":"2023-11-28T19:06:34","date_gmt":"2023-11-28T19:06:34","guid":{"rendered":"\/forum\/forums\/reply\/319858\/"},"modified":"2023-11-28T19:06:34","modified_gmt":"2023-11-28T19:06:34","slug":"319858","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/319858\/","title":{"rendered":"Reply To: Absorption in FDTD two methods different results"},"content":{"rendered":"<p>&lt;p&gt;The reflection monitor should be above the source. Another suggestion is to keep the PML at least lambda (wavelength) spacing from the top or bottom surface of the structure. The way you have placed the monitor for reflection is basically calculating the (source power &#8211; reflection), in the forward direction it is recording the actual injected power coming from the source and in the backwards direction it is calculating reflection and the result is giving as (source power &#8211; reflection), which you are thinking as reflection.&nbsp;&lt;\/p&gt;&lt;p&gt;Place the monitor before the plane wave source, you should get 55.5% reflection and 18.5% transmission.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-319858","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The reflection monitor should be above the source. Another suggestion is to keep the PML at least lambda (wavelength) spacing from the top or bottom surface of the structure. The way you have placed the monitor for reflection is basically calculating the (source power - reflection), in the forward direction it is recording the actual\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/319858\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Absorption in FDTD two methods different results | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The reflection monitor should be above the source. Another suggestion is to keep the PML at least lambda (wavelength) spacing from the top or bottom surface of the structure. The way you have placed the monitor for reflection is basically calculating the (source power - reflection), in the forward direction it is recording the actual\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/319858\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-11-28T19:06:34+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-11-28T19:06:34+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Absorption in FDTD two methods different results | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The reflection monitor should be above the source. Another suggestion is to keep the PML at least lambda (wavelength) spacing from the top or bottom surface of the structure. 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