{"id":457209,"date":"2026-04-27T22:38:32","date_gmt":"2026-04-27T22:38:32","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculating-antenna-zin-in-hfss\/"},"modified":"2026-04-27T22:38:32","modified_gmt":"2026-04-27T22:38:32","slug":"calculating-antenna-zin-in-hfss","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculating-antenna-zin-in-hfss\/","title":{"rendered":"Calculating Antenna Zin in HFSS"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;br&gt;&lt;br&gt;I am simulating a high dielectric planar slot antenna using a lumped port, and I plot the Z11 and get this:<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/27-04-2026-1777329263-mceclip0.png\" width=\"472\" height=\"271\" \/>This shows that the resistive part is very high. My dielectric constant is 85.2.&lt;br&gt;&lt;br&gt;Is this the way to get the input impedance? I am trying to find where the resonance is.&nbsp;&lt;br&gt;Another method I&#8217;m using is to make the port a voltage source and find the current on the port using <img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/27-04-2026-1777329422-mceclip1.png\" \/>. Is this a good way to go about it? Please walk me through the best way to find Zin so that I can be certain that I am looking at the right thing.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-457209","topic","type-topic","status-publish","hentry","topic-tag-hfsslumped_sources-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27789"],"_bbp_topic_id":["457209"],"_bbp_subscription":["501109"],"_bbp_author_ip":["128.194.2.161"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["457209"],"_bbp_last_active_time":["2026-04-27 22:38:32"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["501109"],"_btv_view_count":["48"],"_bbp_topic_status":["unanswered"]},"test":"16e00b28dd2f3b553cd5fa1049ef3b9c4c583265"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/457209","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\/457209\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=457209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}