{"id":406902,"date":"2025-01-24T05:36:45","date_gmt":"2025-01-24T05:36:45","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hfss-analysis-of-feed-horn-radiation-pattern-changes-with-offset-reflectors\/"},"modified":"2025-01-24T05:50:45","modified_gmt":"2025-01-24T05:50:45","slug":"hfss-analysis-of-feed-horn-radiation-pattern-changes-with-offset-reflectors","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hfss-analysis-of-feed-horn-radiation-pattern-changes-with-offset-reflectors\/","title":{"rendered":"[HFSS] Analysis of Feed Horn Radiation Pattern Changes with Offset Reflectors"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt; When the radiation pattern of the feed horn (1.12 GHz) is analyzed using the HFSS-IE Hybrid Solver with the feed horn placed inside a box for FEA and two absorbing panels (Impedance Boundary) installed in front of it, the following result is obtained. However, when aluminum offset parabola dual reflectors are added, the feed horn&#8217;s radiation pattern changes as shown. I would like to know the reason why the feed horn&#8217;s radiation pattern changes, even though it should remain unchanged.&lt;\/p&gt;&lt;p&gt;Before adding reflectors :<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737697349-WOReflector.png\" alt=\"\" width=\"267\" height=\"145\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737697415-WOReflector_gain.png\" alt=\"\" width=\"413\" height=\"123\" \/>&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;After adding reflectors :&lt;\/p&gt;&lt;p&gt;&lt;\/span&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737697829-Reflector.png\" alt=\"image.png\" width=\"230\" height=\"125\" \/>&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;&lt;&lt;\/span&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737697490-Reflector_gain.png\" alt=\"\" width=\"406\" height=\"122\" \/>&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;\/p&gt;&lt;p&gt;&lt;\/span&gt;&lt;strong style=&#8221;font-size: 14pt;&#8221;&gt;Reflector Setup Information<\/strong>&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;:&nbsp;Finite Conductivity Boundary,Hybrid Regions(IE Regions)&lt;\/p&gt;&lt;\/p&gt;&lt;\/span&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li><strong>Material:<\/strong> Aluminum&nbsp;<\/li>\n<li><strong>DC Thickness:<\/strong> 10 mm<\/li>\n<li><strong>Surface Roughness:<\/strong> 0 (Groiss )<\/li>\n<li><strong>Z-axis Reflector Position:<\/strong> 1644.0583 cm from the origin along the Z-axis<\/li>\n<li><strong>Y-axis Reflector Position:<\/strong> -451.17 cm along the Y-axis and -922.24 cm along the Z-axis from the origin<\/li>\n<li><strong>Distance Between Reflectors (Center-to-Center):<\/strong> 1026.68 cm (38.32&lambda; at 1.12 GHz)<\/li>\n<li><strong>Angle Between Reflectors:<\/strong> 26.06855&deg;<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;<strong>Adaptive Solution Settings:<\/strong>&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li><strong>Frequency:<\/strong> 1.12 GHz (Single Frequency)<\/li>\n<li><strong>Maximum Delta S:<\/strong> 0.05 (Convergence Criterion)<\/li>\n<li><strong>Maximum Number of Passes:<\/strong> 5<\/li>\n<li>IE Solver Setting<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737697649-IESolverSetting.png\" alt=\"\uc5c5\ub85c\ub4dc\ud55c \uc774\ubbf8\uc9c0\" \/><\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;I would appreciate guidance on the following points:&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>&lt;p&gt;What are the common factors that could cause a feed horn&#8217;s radiation pattern to change upon the addition of offset parabola dual reflectors?&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Are there specific aspects of the reflector design or placement that I should examine to understand this alteration?&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Could the simulation parameters within HFSS-IE be contributing to this issue, and if so, which settings are most critical to review?&lt;\/p&gt;<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;Any insights or suggestions from those with experience in similar simulations or practical implementations would be highly valuable.&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-406902","topic","type-topic","status-publish","hentry","topic-tag-ansys-hfss","topic-tag-hfss-hybrid","topic-tag-reflector-antenna-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["406902"],"_bbp_subscription":["506809","28551"],"_bbp_author_ip":["106.249.114.164"],"_bbp_last_reply_id":["407592"],"_bbp_last_active_id":["407592"],"_bbp_last_active_time":["2025-01-29 14:40:50"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["506809","28551"],"_btv_view_count":["626"],"_bbp_topic_status":["unanswered"],"_edit_last":["506809"],"_bbp_revision_log":["a:2:{i:406905;a:2:{s:6:\"author\";i:506809;s:6:\"reason\";s:9:\"edit imag\";}i:406906;a:2:{s:6:\"author\";i:506809;s:6:\"reason\";s:0:\"\";}}"],"_bbp_notification_enabled":["506809"]},"test":"shkimdextech-co-kr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406902","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":2,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406902\/revisions"}],"predecessor-version":[{"id":406906,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406902\/revisions\/406906"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=406902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}