{"id":433671,"date":"2025-06-09T23:01:32","date_gmt":"2025-06-09T23:01:32","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/circuit-element-balun-hfss-simulation\/"},"modified":"2025-06-09T23:01:32","modified_gmt":"2025-06-09T23:01:32","slug":"circuit-element-balun-hfss-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/circuit-element-balun-hfss-simulation\/","title":{"rendered":"Circuit Element (Balun) HFSS Simulation"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I&#8217;m trying to simulate a balun (abt-8-75-2) in HFSS by importing the .snp information as a circuit element. However, I&#8217;m only getting ok results and would like to know if I&#8217;ve set up the balun&#8217;s geometry correctly in HFSS.&lt;\/p&gt;&lt;p&gt;The pad dimensions are from the manufacturer datasheet and the red squares are lumped ports that are used to import the .s3p file as a circuit element. The results are similar if the remaining pad is tied to ground.&nbsp;A PEC is placed in contact with all the pads to provide a reference.&lt;\/p&gt;&lt;p&gt;The ports (lumped ports, 75 Ohm) are shown in the other figure. I am using the terminal solution type. The S_ii and S_ij parameters are shown in the below figures. I realize the device isn&#8217;t rated for the entire frequency band, but the results aren&#8217;t good in within band.&lt;\/p&gt;&lt;p&gt;Thanks,&lt;\/p&gt;&lt;p&gt;B.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/09-06-2025-1749509443-balun.png\" alt=\"\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/09-06-2025-1749509876-mceclip2.jpg\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/09-06-2025-1749509876-mceclip3.jpg\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/09-06-2025-1749509876-mceclip4.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-433671","topic","type-topic","status-publish","hentry","topic-tag-circuit-elements-1","topic-tag-hfss"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["433671"],"_bbp_subscription":["560826","469978"],"_bbp_author_ip":["2001:56a:7170:cc00:5c88:6012:aea2:4248"],"_bbp_last_reply_id":["434263"],"_bbp_last_active_id":["434263"],"_bbp_last_active_time":["2025-06-16 22:32:54"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["560826","469978"],"_btv_view_count":["233"],"_bbp_topic_status":["unanswered"]},"test":"dc6642bb57722291fbc0947bc9c00267d3fc6ca3"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/433671","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\/433671\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=433671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}