{"id":242918,"date":"2022-12-05T12:20:53","date_gmt":"2022-12-05T12:20:53","guid":{"rendered":"\/forum\/forums\/topic\/modelling-pla-based-lens-for-77-ghz-radar\/"},"modified":"2023-02-20T07:13:57","modified_gmt":"2023-02-20T07:13:57","slug":"modelling-pla-based-lens-for-77-ghz-radar","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modelling-pla-based-lens-for-77-ghz-radar\/","title":{"rendered":"Modelling PLA based lens for 77 GHz radar."},"content":{"rendered":"

Hi All,<\/p>\n

Sorry for the long post, but I only have the academic licence, so this is the only place I can ask for support.<\/p>\n

I am attempting to adapt this tutorial, https:\/\/www.youtube.com\/watch?v=BfYTrI-U5zs ,which demonstrates how a dieletric lens can focus a source, to this publication https:\/\/www.mdpi.com\/2411-9660\/3\/2\/28\/htm , which involves the use of a 3D printed hyperbolic (Polyactic Acid) PLA lens. More specifically, I am trying to design my own cylindrical hyberbolic lens to “focus” the emitted radiation but only in a single axis. I am attempting to use the same HFSS + SBR combination used in the youtube tutorial since modelling the lens using HFSS alone is too computationally intensive. The issue I am having is that rather than focusing my beam, my lens appears to be reflecting most of the radiation backwards. Below is a screen shot of the radiation pattern of the transmitter without any additional lenses.<\/p>\n

  <\/p>\n

 <\/p>\n

Below is a screen shot of the lens system and the corresponding radiation pattern. I created the lens in a separate 3D CAD programme and imported it into Ansys EDT.<\/p>\n

<\/p>\n

<\/p>\n

 <\/p>\n

For the PLA material I am using the Ansys PLA from the materials editor and the operational wavelength of the system is 77 GHz.<\/p>\n

I have even tried a simple 3mm thick flat sheet of PLA to try and examine the attenuation caused by the PLA material. Below is a screen shot of the system and the radiation pattern.<\/p>\n

<\/p>\n

<\/p>\n

Notice how, even when using a thin flat sheet of PLA the radiation pattern is very similar to that of the PLA lens, implying that even a small amount of PLA will simply reflect the incident radiation rather than focusing it.<\/p>\n

 <\/p>\n

I am new to Ansys so any help is greatly appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-242918","topic","type-topic","status-closed","hentry","topic-tag-ansys-hfss","topic-tag-lens-1","topic-tag-sbr"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["268044","28551"],"_bbp_author_ip":["23.48.209.109"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1380"],"_bbp_status":["publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["242918"],"_bbp_forum_id":["27793"],"_bbp_engagement":["28551","268044"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["246152"],"_bbp_last_active_id":["246152"],"_bbp_last_active_time":["2023-01-11 07:31:24"]},"test":"sjs2001hw-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/242918","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\/242918\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=242918"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}