您好,您的思考是有道理的,如下链接供您参考
https://forum.ansys.com/forums/topic/ansys-insight-zhouqijiegoujieguofenxitoushefanshelusansheyuanchangjiaofenbujinjuchanga/
https://forum.ansys.com/forums/topic/ansys-insight-%e5%85%b3%e4%ba%8efarfield3d%e8%bf%99%e7%b3%bb%e5%88%97%e6%8c%87%e4%bb%a4%e7%9a%84%e7%bb%86%e8%8a%82%e9%97%ae%e9%a2%98/#latest
https://optics.ansys.com/hc/en-us/articles/360034914793-Understanding-the-Assume-Periodic-option-in-far-field-projections
https://optics.ansys.com/hc/en-us/articles/360034394354