{"id":32549,"date":"2019-01-09T21:17:17","date_gmt":"2019-01-09T21:17:17","guid":{"rendered":"\/forum\/forums\/topic\/interpreting-s-parameters-in-circuit-w-link-to-hfss-design-vs-hfss\/"},"modified":"2019-01-09T21:17:17","modified_gmt":"2019-01-09T21:17:17","slug":"interpreting-s-parameters-in-circuit-w-link-to-hfss-design-vs-hfss","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/interpreting-s-parameters-in-circuit-w-link-to-hfss-design-vs-hfss\/","title":{"rendered":"Interpreting S-parameters in Circuit (w\/Link to HFSS Design) vs. HFSS"},"content":{"rendered":"<p>Hello,&nbsp;<\/p>\n<p>I am having trouble interpreting the S-parameters in Circuit Designer and HFSS. I am looking at the S21 between a tuned loop antenna (for f=2.4GHz) and two dipoles (Front Dipole and Back Dipole). I have attached the reported values for 15 different HFSS design variations. I am using circuit designer to tune the antenna (the schematic image is included below). The S-parameters computed in HFSS seem more&nbsp;realistic, but the HFSS design alone does not have any of the matching components for the loop antenna so I am concerned these numbers are not accurate for the situation I am trying to simulate. I would anticipate the circuit S21 to be more accurate (and higher) since the loop antenna is tuned for 2.4GHz, but&nbsp;it is much lower.&nbsp;<\/p>\n<p><\/p>\n<p>How should I be interpreting these S-parameter values in Circuit Designer vs HFSS? What is the &#8220;correct&#8221; value to report if I am looking at the S21 between the tuned loop antenna and each dipole?&nbsp;<\/p>\n<p><\/p>\n<p>Thank you!<\/p>\n<p><\/p>\n<p>Julia&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/7e8d1c73-a6ab-40de-979e-a9ad010887f5\/95871bbd-b5cb-4649-9137-a9d0015bfc1f_screen-shot-2019-01-09-at-4.06.23-pm.jpg?width=690&amp;upscale=false\" alt=\"\">&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/7e8d1c73-a6ab-40de-979e-a9ad010887f5\/2d4d92d7-9cd9-4508-8794-a9d0015b83f8_circuitschematic-rfwireless.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-32549","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["4721"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["3684"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["32549"],"_bbp_forum_id":["27793"],"_bbp_engagement":["38936","160949"],"_bbp_voice_count":["2"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["75737"],"_bbp_last_active_id":["75737"],"_bbp_last_active_time":["2019-01-23 22:24:21"]},"test":"julia"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/32549","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\/32549\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=32549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}