{"id":404782,"date":"2025-01-14T04:29:23","date_gmt":"2025-01-14T04:29:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/urgent-help-please-lumped-port-doesnt-seem-to-be-properly-de-embedded\/"},"modified":"2025-01-14T04:41:22","modified_gmt":"2025-01-14T04:41:22","slug":"urgent-help-please-lumped-port-doesnt-seem-to-be-properly-de-embedded","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/urgent-help-please-lumped-port-doesnt-seem-to-be-properly-de-embedded\/","title":{"rendered":"Urgent, help please! Lumped Port doesn&#8217;t seem to be properly de-embedded?"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Dear Ansys support team,&lt;\/p&gt;&lt;p&gt;I am using HFSS to simulate a simple microstrip line to fit my measured data. I noticed that the one simulated by lumped port shows unresonable return loss ( thus the insertion loss) compared with the waveport, ADS momentum, or the measured data, as shown in the picture below. I suspect this happened because of the port de-embedding options in lumped ports of HFSS. I did a quick simulation using ADS components, which shows that by putting a shunt capacitor of 6 fF at the ports, ADS can explain the high return loss of the simulation using HFSS lumped port. Does this indicate the the lumped ports in HFSS are not properly de-embeded eventhough the &#8220;de-embed&#8221; option is selected? I wonder if you can help check the attached Ansys project to make s&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;ure my set up is correct? Also, I wonder, since in many cases we need lumped ports as internal ports, how can we use the lumped ports with confidence?&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/14-01-2025-1736828313-HFSS_lumped_vs_waveports.png\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;Note: Ansys HFSS version is 24R2 on Linux. Here is the google drive link for the HFSS project:<a href=\"https:\/\/drive.google.com\/file\/d\/1wydOCVXxWRC8qCl9t6zl-hll5WZF0HVm\/view?usp=sharing\" target=\"_blank\" rel=\"noopener\">https:\/\/drive.google.com\/file\/d\/1wydOCVXxWRC8qCl9t6zl-hll5WZF0HVm\/view?usp=sharing<\/a>&lt;\/p&gt;&lt;p&gt;Thank you!&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-404782","topic","type-topic","status-publish","hentry","topic-tag-hfsslumped_sources-1","topic-tag-question-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["404782"],"_bbp_subscription":["248475","469978"],"_bbp_author_ip":["171.122.17.186"],"_bbp_last_reply_id":["405034"],"_bbp_last_active_id":["405034"],"_bbp_last_active_time":["2025-01-15 07:52:44"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["248475","469978"],"_btv_view_count":["701"],"_bbp_topic_status":["unanswered"],"_edit_last":["248475"],"_bbp_revision_log":["a:3:{i:404783;a:2:{s:6:\"author\";i:248475;s:6:\"reason\";s:0:\"\";}i:404785;a:2:{s:6:\"author\";i:248475;s:6:\"reason\";s:0:\"\";}i:404786;a:2:{s:6:\"author\";i:248475;s:6:\"reason\";s:0:\"\";}}"]},"test":"ll886cornell-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/404782","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":3,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/404782\/revisions"}],"predecessor-version":[{"id":404786,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/404782\/revisions\/404786"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=404782"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}