{"id":159025,"date":"2022-07-04T06:59:53","date_gmt":"2022-07-04T06:59:53","guid":{"rendered":"\/knowledge\/forums\/topic\/mode-conversion-path-vias-in-differential-via-pairs-in-ansys-hfss\/"},"modified":"2022-07-04T07:50:57","modified_gmt":"2022-07-04T07:50:57","slug":"mode-conversion-path-vias-in-differential-via-pairs-in-ansys-hfss","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/mode-conversion-path-vias-in-differential-via-pairs-in-ansys-hfss\/","title":{"rendered":"Mode Conversion Path Vias in Differential Via Pairs in ANSYS HFSS"},"content":{"rendered":"<p>This signal integrity video explores unwanted mode conversion, from differential signal to common signal, due to unbalanced ground return current via paths in a multilayer differential pair simulated in HFSS 3D Layout. Starting at 1:35, the video shows how to move a differential pair, including the port, from one lower layer up to another layer in one operation. At 2:46 the video describes the engineering relation between asymmetry and mode conversion in terms of mixed mode S-parameters. The HFSS 3D Layout unbalanced (asymmetric) design, with a ground return path via missing, is created after 4:58. The change to an HFSS fully arbitrary 3D (FA3D) design starts at 7:19, with the symmetrical S-parameters shown at 8:34. The asymmetrical (unbalanced) FA3D design consideration starts at 9:14<br \/>\n<iframe loading=\"lazy\" title=\"Mode Conversion Path Vias in Differential Via Pairs in ANSYS HFSS\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/M92lOv-AYmA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n","protected":false},"template":"","class_list":["post-159025","topic","type-topic","status-publish","hentry","topic-tag-ansys-electromagnetics","topic-tag-ansys-hfss","topic-tag-differential-pair","topic-tag-mode-coversion"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3\/6\/2022 20:20"],"_bbp_forum_id":["27819"],"_btv_view_count":["4644"],"_edit_lock":["1656921220:76714"],"_edit_last":["76714"],"_bbp_topic_id":["159025"],"_oembed_dd54dcf68da3b64ee6542b6deb3d30dd":["<iframe title=\"Mode Conversion Path Vias in Differential Via Pairs in ANSYS HFSS\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/M92lOv-AYmA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>"],"_oembed_time_dd54dcf68da3b64ee6542b6deb3d30dd":["1656921177"],"_oembed_e9cda78e3ddaad0aae0cebf0c8915f30":["<iframe title=\"Mode Conversion Path Vias in Differential Via Pairs in ANSYS HFSS\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/M92lOv-AYmA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>"],"_oembed_time_e9cda78e3ddaad0aae0cebf0c8915f30":["1712302461"],"_bbp_likes_count":["1"]},"test":"watchlearnansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/159025","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/159025\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=159025"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}