{"id":222624,"date":"2022-07-28T20:04:49","date_gmt":"2022-07-28T20:04:49","guid":{"rendered":"\/forum\/forums\/topic\/hfss-frequency-dependent-materials-settings\/"},"modified":"2022-07-28T20:04:49","modified_gmt":"2022-07-28T20:04:49","slug":"hfss-frequency-dependent-materials-settings","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hfss-frequency-dependent-materials-settings\/","title":{"rendered":"HFSS Frequency Dependent Materials Settings"},"content":{"rendered":"<p class=\"MsoNormal\"><span lang=\"EN-US\">I am using AnsysEM HFSS to do the signal integrity project. To define the materials effective dielectric constant and loss tangent, I created two datasets. I entered the value of dielectric constant and loss tangent from 1GHz to 10GHz as shown in Fig1. My simulation is from 0GHz to 64GHz. <\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">I also tested if dielectric constant and loss tangent is constant after 10GHz, shown in Fig.2. However, the results shown a large variance, shown in Fig3. <\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">My next hypothesis is that dielectric constant and loss tangent will be linearly increasing\/decreasing after 10GHz as shown in Fig4. However, this simulation took more than two days and HFSS crushed during the simulation.<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">What will be the behavior of the dielectric constant and loss tangent after 10GHz?<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/07\/28-07-2022-1659038436-mceclip0.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/07\/28-07-2022-1659038473-mceclip1.png\"><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\" style=\"font-size: 11.0pt;font-family: 'Arial',sans-serif;color: black;border: none windowtext 1.0pt;padding: 0cm\"><br \/><!--[endif]--><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">Fig1. Dielectric constant(left) and loss tangent(right)<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/07\/28-07-2022-1659038485-mceclip2.png\"><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">Fig2. Dielectric constant and loss tangent constant after 10GHz.<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/07\/28-07-2022-1659038503-mceclip3.png\"><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\"><br \/><!--[endif]--><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">Fig3. Simulated results (red: only three data points entered from 1GHz to 10GHz; blue: Dielectric constant and loss tangent constant after 10GHz)<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/07\/28-07-2022-1659038514-mceclip4.png\"><br \/><!--[endif]--><\/span><\/p>\n<p class=\"MsoNormal\"><span lang=\"EN-US\">Fig4. Dielectric constant and loss tangent will be linearly increasing\/decreasing after 10GHz<\/span><\/p>\n","protected":false},"template":"","class_list":["post-222624","topic","type-topic","status-closed","hentry","topic-tag-high-frequencies","topic-tag-materials-problem","topic-tag-simulation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["260724","28551"],"_bbp_author_ip":["66.198.8.115"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["3308"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["222624"],"_bbp_forum_id":["27793"],"_bbp_engagement":["28551","260724"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["233003"],"_bbp_last_active_id":["233003"],"_bbp_last_active_time":["2022-08-16 08:20:37"]},"test":"wx5illinois-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/222624","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\/222624\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=222624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}