{"id":365487,"date":"2024-05-04T01:44:47","date_gmt":"2024-05-04T01:44:47","guid":{"rendered":"\/forum\/forums\/topic\/how-to-set-simulation-conditions-for-coplanar-microstrip-line-cps-or-differenti\/"},"modified":"2024-05-04T01:44:47","modified_gmt":"2024-05-04T01:44:47","slug":"how-to-set-simulation-conditions-for-coplanar-microstrip-line-cps-or-differenti","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-set-simulation-conditions-for-coplanar-microstrip-line-cps-or-differenti\/","title":{"rendered":"How to set simulation conditions for coplanar microstrip line CPS (or differenti"},"content":{"rendered":"<p>Hello! I encountered some problems when simulating and designing coplanar strip lines (or differential lines) using HFSS, please help:&nbsp;<\/p>\n<p>1. I can run the official example&nbsp;<em>differential_microstrip.aedt<\/em> normally, but when I removed the metal boundary condition at the bottom of the air box and replaced it with a radiation boundary condition (removed GND), I ran again and encountered an error: <strong>Solving adaptive frequency &#8230;, process hf3d error: Too few conductors were found on port 1. &nbsp;There should be one conductor for each terminal, with one additional reference conductor. &nbsp;Unintentional contact between conductors may cause this error.. Please contact Ansys technical support.<\/strong> Must this GND exist? Can I set one of the coplanar strip lines as the signal line and the other the GND, like a coplanar waveguide (CPW)? Additionally, <em>Deembed<\/em> seems to have a significant impact on the results. What does this variable mean?<\/p>\n<p>2. My ultimate goal is to design a pair of ground-signal (GS) electrodes (sub millimeter level) on the chip with a frequency range of around 0-20GHz. The substrate of the chip is silicon (hundred um level) and silicon dioxide (um level), as shown in the schematic diagram below. Therefore, there are electrodes and two substrates within the range of microwave wavelengths. How should I set waveport and terminal to obtain the correct results? Should the size be set to about ten times the electrode width or spacing, as in CPW, or should it be set to near the wavelength level? <img decoding=\"async\" style=\"font-size: 18.6667px\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/04-05-2024-1714786973-image.PNG\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-365487","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["257372","61299","109997","130768"],"_bbp_author_ip":["23.192.127.5"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2047"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["365487"],"_bbp_forum_id":["27793"],"_bbp_engagement":["61299","109997","130768","257372"],"_bbp_voice_count":["4"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["367042"],"_bbp_last_active_id":["367042"],"_bbp_last_active_time":["2024-05-16 08:12:13"]},"test":"308053014qq-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/365487","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\/365487\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=365487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}