{"id":408884,"date":"2025-02-07T23:22:13","date_gmt":"2025-02-07T23:22:13","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/radiation-loss-in-mode-simulation\/"},"modified":"2025-02-07T23:22:13","modified_gmt":"2025-02-07T23:22:13","slug":"radiation-loss-in-mode-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/radiation-loss-in-mode-simulation\/","title":{"rendered":"Radiation loss in MODE simulation"},"content":{"rendered":"<p>&lt;p&gt;I am trying to do a mode simulation for a multimode waveguide, the radiation loss shows negative value, I don&#8217;t understand why is that. I tried both loose and tight bend and varying the simulation region size, but couldn&#8217;t get rid of this issue. I used PML for all boundaries, and I don&#8217;t undertsand where does the gain come from.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/02\/07-02-2025-1738970237-Screenshot 2025-02-07 144514.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/02\/07-02-2025-1738970263-Screenshot 2025-02-07 1445141.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/02\/07-02-2025-1738970525-Screenshot 2025-02-07 152141.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-408884","topic","type-topic","status-publish","hentry","topic-tag-bendingloss-1","topic-tag-MODE-1","topic-tag-radiation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["408884"],"_bbp_subscription":["45962","443894"],"_bbp_author_ip":["206.87.146.7"],"_bbp_last_reply_id":["423096"],"_bbp_last_active_id":["423096"],"_bbp_last_active_time":["2025-02-24 23:34:56"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["45962","443894"],"_btv_view_count":["262"],"_bbp_topic_status":["unanswered"]},"test":"mathewyuece-ubc-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/408884","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/408884\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=408884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}