{"id":393072,"date":"2024-11-06T22:36:47","date_gmt":"2024-11-06T22:36:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/393072\/"},"modified":"2024-11-06T22:36:47","modified_gmt":"2024-11-06T22:36:47","slug":"393072","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/393072\/","title":{"rendered":"Reply To: Why does source size keep expanding automatically?"},"content":{"rendered":"<p>&lt;p style=&#8221;font-size: 10pt; line-height: 1.2; margin-bottom: 24px;&#8221;&gt;Hello pm796,&lt;\/p&gt;&lt;p style=&#8221;font-size: 10pt; line-height: 1.5; margin: 8px 0;&#8221;&gt;In short, this is a feature of the GUI. It is implemented to prevent field truncation <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034382874-Understanding-field-truncation-issues-with-finite-sized-plane-wave-sources\" target=\"_blank\" rel=\"noopener\"> issues with finite-sized plane wave sources <\/a>. This topic has been previously discussed on the forum; see <a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/trouble-getting-correct-fdtd-plane-wave-region\/\" target=\"_blank\" rel=\"noopener\"> Trouble Getting Correct FDTD Plane Wave Region <\/a>.&lt;\/p&gt;&lt;p style=&#8221;font-size: 10pt; line-height: 1.5; margin: 8px 0;&#8221;&gt;Please also check the following resources:&nbsp;<a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034902273-Broadband-Fixed-Angle-Source-Technique-BFAST\" target=\"_blank\" rel=\"noopener\"> Broadband Fixed Angle Source Technique (BFAST) <\/a> and <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034382414-Always-extend-structures-through-PML-boundary-conditions\" target=\"_blank\" rel=\"noopener\"> Always extend structures through PML boundary conditions <\/a>.&lt;\/p&gt;&lt;p style=&#8221;font-size: 10pt; line-height: 1.2; margin-top: 24px;&#8221;&gt;Best regards,&lt;\/p&gt;&lt;p style=&#8221;font-size: 10pt; line-height: 1.2; font-family: &#8216;Aptos&#8217;, sans-serif; margin-top: 0;&#8221;&gt;Kirill&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393072","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=\"Hello pm796,In short, this is a feature of the GUI. 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