{"id":458898,"date":"2026-05-27T08:18:08","date_gmt":"2026-05-27T08:18:08","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-in-siwave-simulation-after-importing-the-snp-file\/"},"modified":"2026-05-27T08:18:08","modified_gmt":"2026-05-27T08:18:08","slug":"issue-in-siwave-simulation-after-importing-the-snp-file","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issue-in-siwave-simulation-after-importing-the-snp-file\/","title":{"rendered":"Issue in Siwave simulation after importing the SNP file"},"content":{"rendered":"

<p>Hello everyone,<br>I’m having an issue while simulating with Siwave.<br>Let me first provide some background:<br>This is what our OBD++ looks like when opened in Siwave; the component in the red box is a TDK low-pass filter.<\/p><p><\/p><p>I have the S2P file for this LPF, and I simulated it in ADS. This LPF has excellent insertion loss.<\/p><p><\/p><p>I now want to import this S2P file into Siwave and disable all the capacitors and inductors connected to this device, adding a port at each end.<\/p><p><\/p><p>Here are the steps I follow to import S2P file.<\/p><p><\/p><p><\/p><p>Next, I set the frequency range for the simulation.<\/p><p><\/p><p><\/p><p>After simulation, an S2P file was generated, which was opened in ADS.<\/p><p>The insertion loss is surprisingly high.<\/p><p><\/p><p>Next, I wondered if there might be a problem with the traces at either end, so I simulated each trace separately and checked the results in ADS.<\/p><p>Trace 01<\/p><p><\/p><p><\/p><p>Trace 02<\/p><p><\/p><p><\/p><p>Based on the simulation results, there are no issues with these two traces.<\/p><p>So I connected the S2P files for these two traces and the LPF’s S2P file in ADS to view the overall S-parameters.<\/p><p>The results are significantly better than the S-parameters obtained from direct simulation in Siwave.<\/p><p><\/p><p>Right now, I’m really eager to figure out exactly where the problem lies. I’ve been checking it for several days now, but I still can’t find the cause.<\/p><p>Could anyone help me?<\/p><p> <\/p><\/p>\n","protected":false},"template":"","class_list":["post-458898","topic","type-topic","status-publish","hentry","topic-tag-AnsysSiwave-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["458898"],"_bbp_subscription":["692392"],"_bbp_author_ip":["185.116.235.9"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["458898"],"_bbp_last_active_time":["2026-05-27 08:18:08"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["692392"],"_btv_view_count":["12"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1779870048:692392"]},"test":"sunjianwudi19870311gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/458898","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\/458898\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=458898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}