{"id":169299,"date":"2022-05-10T08:20:48","date_gmt":"2022-05-10T08:20:48","guid":{"rendered":"\/forum\/forums\/topic\/calculating-relative-permittivity-from-measured-values\/"},"modified":"2022-05-12T08:27:34","modified_gmt":"2022-05-12T08:27:34","slug":"calculating-relative-permittivity-from-measured-values","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculating-relative-permittivity-from-measured-values\/","title":{"rendered":"Calculating Relative Permittivity from Measured Values"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi all,<\/p>\n<p>I have measured some permittivity and permeability values of my materials which I am hoping to import into Ansys, and I have set up databases with the values in to enable me to calculate it in the program using pwl($e1,Freq)-1i*pwl($e2,Freq), however I am very confused over whether or not to use a minus or plus between the real and imaginary parts! Using basic construction of complex numbers, I would assume I use a plus, but everywhere I look for electromagnetics people use -j, but then say it&#039;s just a sign convention and is arbitrary. However, changing the equation in Ansys gives wildly different answers if I use one to another, so it can&#039;t be that arbitrary! <\/p>\n<p>If anyone can please help me out here and advise which I should use that would be tremendously helpful! I am very much out of my physics depth here (I&#039;m a chemist by background and stumbled into computationally deriving EM), and was hoping to just get a complex permittivity value out of my kit but alas was not to be!<\/p>\n<p>Thanks so much \ud83d\ude42<\/p>\n","protected":false},"template":"","class_list":["post-169299","topic","type-topic","status-closed","hentry","topic-tag-ansys","topic-tag-hfss","topic-tag-sbr"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["1458"],"_bbp_likes_count":["0"],"_bbp_subscription":["51998","28551"],"_bbpmt_movedon":["2022-07-01 16:12:07"],"_bbpmt_movedfrom":["151970"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["169299"],"_bbp_forum_id":["27793"],"_bbp_engagement":["28551","51998"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["234628"],"_bbp_last_active_id":["234628"],"_bbp_last_active_time":["2022-09-07 08:31:59"]},"test":"adam-nevintrelleborg-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/169299","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\/169299\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=169299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}