{"id":457144,"date":"2026-04-27T08:16:37","date_gmt":"2026-04-27T08:16:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-improve-s-parameters\/"},"modified":"2026-04-27T08:16:37","modified_gmt":"2026-04-27T08:16:37","slug":"how-to-improve-s-parameters","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-improve-s-parameters\/","title":{"rendered":"How to improve S-parameters\uff1f"},"content":{"rendered":"<p>&lt;p&gt;<a href=\"I have encountered some issues during radio frequency (RF) simulation. When the design includes three RF input ports, how should the coplanar waveguide (CPW) structure be optimized to minimize the S11 and S21 values within the frequency range of 0&ndash;20 GHz? The spacing between the three RF structures is 15 mm. The substrate used is ALN with a thickness of 0.254 mm. The signal conductor has a thickness of 0.018 mm, a width of 0.2 mm, and a length of 6 mm. The gap between the signal line and the adjacent ground electrodes on both sides is 0.14 mm. The simulated S\u2011parameter performance is poor. Please advise on the appropriate design improvements for the coplanar waveguide structure.\">I have encountered some issues during radio frequency (RF) simulation. When the design includes three RF input ports, how should the coplanar waveguide (CPW) structure be optimized to minimize the S11 and S21 values within the frequency range of 0&ndash;20 GHz? The spacing between the three RF structures is 15 mm. The substrate used is ALN with a thickness of 0.254 mm. The signal conductor has a thickness of 0.018 mm, a width of 0.2 mm, and a length of 6 mm. The gap between the signal line and the adjacent ground electrodes on both sides is 0.14 mm. The simulated S\u2011parameter performance is poor. Please advise on the appropriate design improvements for the coplanar waveguide structure.<\/a>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/27-04-2026-1777277747-ScreenShot_2026-04-27_161044_161.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-457144","topic","type-topic","status-publish","hentry","topic-tag-50-ohms","topic-tag-rfid"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["457144"],"_bbp_subscription":["680670"],"_bbp_author_ip":["2001:250:5409:aa34:3159:5d4:f323:1caf"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["457144"],"_bbp_last_active_time":["2026-04-27 08:16:37"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["680670"],"_btv_view_count":["25"],"_bbp_topic_status":["unanswered"]},"test":"y25080034stu-aqnu-edu-cn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457144","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\/457144\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457144"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}