{"id":397372,"date":"2024-12-13T09:16:32","date_gmt":"2024-12-13T09:16:32","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/far-field-2d-fdtd\/"},"modified":"2024-12-13T09:16:32","modified_gmt":"2024-12-13T09:16:32","slug":"far-field-2d-fdtd","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/far-field-2d-fdtd\/","title":{"rendered":"Far-Field 2D FDTD"},"content":{"rendered":"

<p>Hello everyone,<br><br>I am working with a 2D periodic structure with waveguide incidence. I have a monitor named “field top” and I need to calculate the far field using the farfield2d script command.<br><br>Following the instructions provided in the Ansys example, I ran the FDTD simulation and then executed the following lines of code:<br><br>E = farfield2d(“field top”, 1);<br>theta = farfieldangle(“field top”, 1);<br><br>However, running these lines gives me the following error:<br>”In farfield2d the frequency is out of range”.<br><br>According to the Ansys documentation, the number 1 in the input represents the index of the frequency value to calculate.<br>In my simulation settings, I set f_points = 300, so I don’t understand how 1 could be out of range. Even when I try varying the index, I get the same error.<br><br>Could the issue be related to the fact that I set the range using wavelengths?<br>For completeness, here are the relevant lines of code:<br>addmode;<br>[…]<br>set(“wavelength start”, wl_start);<br>set(“wavelength stop”, wl_stop);<br>(The range is from 0.4 microns to 0.7 microns.)<br><br>Could someone help me with this?<br>Thanks in advance for your help!<br><br>Giovanni<\/p><\/p>\n","protected":false},"template":"","class_list":["post-397372","topic","type-topic","status-publish","hentry","topic-tag-3DFDTD-1","topic-tag-gratings-farfield-2","topic-tag-metasurface-1"],"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