{"id":389193,"date":"2024-10-11T01:41:54","date_gmt":"2024-10-11T01:41:54","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389193\/"},"modified":"2024-10-11T01:41:54","modified_gmt":"2024-10-11T01:41:54","slug":"389193","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389193\/","title":{"rendered":"Reply To: SIwave thermal modifier"},"content":{"rendered":"<p>&lt;p&gt;Hi Jhyeon,&lt;\/p&gt;&lt;p&gt;To set the correct thermal modifier equations for dielectrics like FR-4 and PTFE in SIwave, you can refer to the Ansys documentation which provides a formula for temperature-dependent dielectric loss tangent. You can select &#8216;Expression&#8217; to define an equation for the thermal modifier in the Modifier field. Additionally, under the Basic Coefficient tab, you can edit fields for the TempRef and units, and fields for C1 and C2 for the following equation: P(Temp) = Pref[1+ C1(Temp &#8211; TempRef) + C2(Temp &#8211; TempRef)^2], where TempRef is 22&deg;C by default and where the Pref is defined as the reference relative permittivity [ <a href=\"https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/Electronics\/v232\/en\/home.htm%23..\/Subsystems\/Mechanical\/Content\/Materials\/SpecifyingThermalModifiers.htm?TocPath=Mechanical%257CMechanical%2520Help%257CAssigning%2520Materials%257CAdding%2520New%2520Materials%257C_____3\" target=\"_blank\" rel=\"noopener\">https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/Electronics\/v232\/en\/home.htm%23..\/Subsystems\/Mechanical\/Content\/Materials\/SpecifyingThermalModifiers.htm?TocPath=Mechanical%257CMechanical%2520Help%257CAssigning%2520Materials%257CAdding%2520New%2520Materials%257C_____3<\/a>&lt;br&gt;&lt;br&gt;Please note that the coefficients, C1 and C2, should be negative to yield physical results. For more detailed methods of applying a thermal modifier, you can also look at the provided images and instructions in the SIWAVE documentation&nbsp;<a href=\"https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/Electronics\/v232\/en\/Subsystems\/SIwave\/SIwave.htm%23AssigningThermalSpatialModifiers.htm?TocPath=SIwave%2520Help%257CLayers%2520and%2520Materials%257CMaterials%257CMaterial%2520Properties%257C_____6\" target=\"_blank\" rel=\"noopener\">https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/Electronics\/v232\/en\/Subsystems\/SIwave\/SIwave.htm%23AssigningThermalSpatialModifiers.htm?TocPath=SIwave%2520Help%257CLayers%2520and%2520Materials%257CMaterials%257CMaterial%2520Properties%257C_____6&nbsp;<\/a>&lt;\/p&gt;&lt;p&gt;Hope this helps, Thanks.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389193","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Jhyeon,To set the correct thermal modifier equations for dielectrics like FR-4 and PTFE in SIwave, you can refer to the Ansys documentation which provides a formula for temperature-dependent dielectric loss tangent. You can select &#039;Expression&#039; to define an equation for the thermal modifier in the Modifier field. Additionally, under the Basic Coefficient tab, you\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389193\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: SIwave thermal modifier | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi Jhyeon,To set the correct thermal modifier equations for dielectrics like FR-4 and PTFE in SIwave, you can refer to the Ansys documentation which provides a formula for temperature-dependent dielectric loss tangent. You can select &#039;Expression&#039; to define an equation for the thermal modifier in the Modifier field. Additionally, under the Basic Coefficient tab, you\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/389193\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-11T01:41:54+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-11T01:41:54+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: SIwave thermal modifier | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi Jhyeon,To set the correct thermal modifier equations for dielectrics like FR-4 and PTFE in SIwave, you can refer to the Ansys documentation which provides a formula for temperature-dependent dielectric loss tangent. 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You can select 'Expression' to define an equation for the thermal modifier in the Modifier field. 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You can select 'Expression' to define an equation for the thermal modifier in the Modifier field. 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