{"id":223338,"date":"2022-08-05T07:54:02","date_gmt":"2022-08-05T07:54:02","guid":{"rendered":"\/forum\/?post_type=topic&p=223338"},"modified":"2022-08-05T08:03:57","modified_gmt":"2022-08-05T08:03:57","slug":"output-transmission-is-greater-than-input-transmission-in-taper-structure","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/output-transmission-is-greater-than-input-transmission-in-taper-structure\/","title":{"rendered":"output transmission is greater than input transmission in taper structure"},"content":{"rendered":"

I am working on a simulation (varFDTD in MODE) of a taper structure (see the attached schematics) to calculate the loss. But I found something weird.<\/p>\n

I use a mode source in the simulation. However, the transmission spetrum (see the attached figure) at the output (green line) is greater than that at the input port (blue line), which from my perspective is not reasonable.<\/p>\n

I have tried several ways, e.g., increasing simulation time, the number of the PML layers and the mesh accuracy to deal with this issue, but all in vain. Is there any idea to solve this issue? <\/p>\n

Let me know if more detail is needed.<\/p>\n

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Here are some screenshots of the settings in the simulation.<\/p>\n

\"\"<\/a>\"\"<\/a><\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-223338","topic","type-topic","status-closed","hentry","topic-tag-taper","topic-tag-transmission-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["66.198.8.115"],"_bbp_subscription":["260603","2592"],"_edit_lock":["1659689203:76739"],"_btv_view_count":["676"],"_bbp_likes_count":["1"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["223338"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","260603"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["223508"],"_bbp_last_active_id":["223508"],"_bbp_last_active_time":["2022-08-08 09:35:39"]},"test":"shiang-yu-huangfmq-uni-stuttgart-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/223338","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\/223338\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=223338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}