{"id":455929,"date":"2026-04-07T11:43:00","date_gmt":"2026-04-07T11:43:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-assign-ports-for-a-cpw-when-the-substrate-is-much-larger-than-the-line\/"},"modified":"2026-04-07T11:43:00","modified_gmt":"2026-04-07T11:43:00","slug":"how-to-assign-ports-for-a-cpw-when-the-substrate-is-much-larger-than-the-line","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-assign-ports-for-a-cpw-when-the-substrate-is-much-larger-than-the-line\/","title":{"rendered":"How to assign ports for a CPW when the substrate is much larger than the line?"},"content":{"rendered":"<p>&lt;p data-start=&#8221;243&#8243; data-end=&#8221;275&#8243;&gt;Hello everyone,&lt;\/p&gt;&lt;p data-start=&#8221;277&#8243; data-end=&#8221;377&#8243;&gt;I am simulating a coplanar waveguide (CPW) structure in HFSS and I have a question about port setup.&lt;\/p&gt;&lt;p data-start=&#8221;379&#8243; data-end=&#8221;590&#8243;&gt;My model is a CPW transmission line on a dielectric substrate. The issue is that the substrate size is larger than the CPW dimensions. In this case, I want to konw how to properly define the excitation port.&lt;\/p&gt;&lt;p data-start=&#8221;379&#8243; data-end=&#8221;590&#8243;&gt;Thank you.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/07-04-2026-1775561212-fig1.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-455929","topic","type-topic","status-publish","hentry","topic-tag-coplanar","topic-tag-hfss"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["455929"],"_bbp_subscription":["673073"],"_bbp_author_ip":["2001:250:5007:96::2:a6ba"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["455929"],"_bbp_last_active_time":["2026-04-07 11:43:00"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["673073"],"_btv_view_count":["7"],"_bbp_topic_status":["unanswered"]},"test":"1828149251qq-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/455929","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\/455929\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=455929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}