{"id":373027,"date":"2024-07-22T13:28:43","date_gmt":"2024-07-22T13:28:43","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-on-calculating-port-impedance-zpv-using-field-calculator-under-hfss-please\/"},"modified":"2024-07-22T13:28:43","modified_gmt":"2024-07-22T13:28:43","slug":"help-on-calculating-port-impedance-zpv-using-field-calculator-under-hfss-please","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-on-calculating-port-impedance-zpv-using-field-calculator-under-hfss-please\/","title":{"rendered":"Help on calculating port impedance Zpv using Field calculator under HFSS please"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I have a microstrip with a terminal voltage at total = 1V with port impoedance set to 50 ohm:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-pojggck4n2ed1.png?width=1008&amp;format=png&amp;auto=webp&amp;s=cd13c640aef9b960c1a24f68bf17fe44b79639ff\" alt=\"CDN media\" width=\"506\" height=\"239\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-70jydrjak2ed1.png?width=1557&amp;format=png&amp;auto=webp&amp;s=e027831b9f947668dbcfc83ac30137a9ecb7fc80\" alt=\"CDN media\" width=\"511\" height=\"378\"><\/p>\n<p>I want to calculate port impedance using Field Calculator : Zpv = V&sup2;\/P.<\/p>\n<p>For calculating V, I integrate E along the line :<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-6ck4bx72m2ed1.png?width=348&amp;format=png&amp;auto=webp&amp;s=99826a973eb2cf49e902ef2fecd9b5c523972f4f\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\"><\/p>\n<p>using this formula :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-018n41cxl2ed1.png?width=570&amp;format=png&amp;auto=webp&amp;s=7b9de583f65445a1b39efb1304f3b1f29af96184\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"251\" height=\"69\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-3h6yuli1l2ed1.png?width=1606&amp;format=png&amp;auto=webp&amp;s=eeec5d70d3215870277fa5483d3ed507fb7e469a\" alt=\"CDN media\" width=\"1004\" height=\"40\"><\/p>\n<p>and I got 1V so it work OK:<\/p>\n<figure class=\"rte-media\"><img loading=\"lazy\" decoding=\"async\" style=\"float: left\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-izr93zh5m2ed1.png?width=795&amp;format=png&amp;auto=webp&amp;s=99ae18e885478317ad7e0ee9ca303813ea97a15d\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"502\" height=\"113\"><\/figure>\n<p>For calculating P, I integrate Poyting vector on this surface :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-6rimfhmim2ed1.png?width=1052&amp;format=png&amp;auto=webp&amp;s=455edbfe375254eed3429d29c311eb32b4b930fd\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"485\" height=\"287\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-2algo80fm2ed1.png?width=914&amp;format=png&amp;auto=webp&amp;s=c8a6c3c5a55765e5201281d737aaeba0079cc67d\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"638\" height=\"30\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-syz6150nm2ed1.png?width=351&amp;format=png&amp;auto=webp&amp;s=bda1ddf26b125620f54bd69d6e4fc5620b9492bd\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"203\" height=\"88\"><\/p>\n<p>But after dividing quantity, I don&#8217;t got 50 ohm but 318 ohm :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/preview.redd.it\/help-on-calculating-port-impedance-zpv-using-field-v0-wp8ud81sm2ed1.png?width=757&amp;format=png&amp;auto=webp&amp;s=006775c227e823fb7dd672a8ebfca2bb6db2d256\" alt=\"r\/ANSYS - Help on calculating port impedance Zpv using Field calculator (terminal driven voltage on microstrip)\" width=\"376\" height=\"91\"><\/p>\n<p>So it seems that my value for P is wrong no ?<\/p>\n<div class=\"flex flex-col grow max-w-full\">\n<div class=\"text-neutral-content\">\n<div class=\"mb-sm  mb-xs px-md xs:px-0\" data-post-click-location=\"text-body\">\n<div id=\"t3_1e9e88x-post-rtjson-content\" class=\"md text-14\">\n<p>Thanks you !<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"template":"","class_list":["post-373027","topic","type-topic","status-closed","hentry","topic-tag-ansys-hfss","topic-tag-Impedancecalculation-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["287497","20363"],"_bbp_author_ip":["90.3.139.111"]," _bbp_last_reply_id":["0"],"_btv_view_count":["591"]," _bbp_likes_count":["0"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["373027"],"_bbp_forum_id":["27793"],"_bbp_engagement":["20363","287497"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["382775"],"_bbp_last_active_id":["382775"],"_bbp_last_active_time":["2024-09-16 14:11:07"]},"test":"alexandre-antoi-bourrieauac-creteil-fr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/373027","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\/373027\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=373027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}