{"id":362925,"date":"2024-04-18T11:21:52","date_gmt":"2024-04-18T11:21:52","guid":{"rendered":"\/forum\/forums\/topic\/poynting-vector-in-ansys-hfss\/"},"modified":"2024-04-18T11:21:52","modified_gmt":"2024-04-18T11:21:52","slug":"poynting-vector-in-ansys-hfss","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/poynting-vector-in-ansys-hfss\/","title":{"rendered":"Poynting vector in Ansys HFSS"},"content":{"rendered":"

I am trying to use HFSS to give an example to my students about poynting vector. The model I am simulating is a simple rectangular waveguide (WR340) of 20 cm long and with an input signal of 2.45 GHz and 1 W. On both sides a wave port is assigned. The poynting vector is calculated in a non-model surface in both ports and in the middle of the waveguide as seen in the image.<\/p>\n

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The poynting vector has been calculated using fields calculator tool by selecting the real poynting vector and integrating it on a selected surface. With an input signal of 1 W and ports on both sides, the value of the power through each surface should be exactly 1 W (or a bit less because of losses). However, the evaluated power is 1.019 W on the input port, 1.017 W on the output port and 1.008 W on the middle of the waveguide.<\/p>\n

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So I would appreciate if someone could with a me hint why this happens. Thank you all. <\/p>\n","protected":false},"template":"","class_list":["post-362925","topic","type-topic","status-closed","hentry","topic-tag-waveguide-2","topic-tag-ansys-hfss","topic-tag-hfss"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t