Reply To: Why does source size keep expanding automatically?

[Kirill]

Hello pm796,

In short, this is a feature of the GUI. It is implemented to prevent field truncation issues with finite-sized plane wave sources . This topic has been previously discussed on the forum; see Trouble Getting Correct FDTD Plane Wave Region .

Please also check the following resources:  Broadband Fixed Angle Source Technique (BFAST) and Always extend structures through PML boundary conditions .

Best regards,

Kirill