Analysis of collocating and non-collocating on near-to-far-field transformation

When calculating the Near-To-Far-Field (NTFF), we need to select a virtual surface. However, in the Finite-Difference Time-Domain (FDTD) method, the electric field and magnetic field are misaligned in space. Therefore, if the electric field is used for far-field calculations, the magnetic field must be obtained by the averaging method. We use collocating to average the magnetic field and compare it with non-collocating. We expect that the result of collocating will be more accurate when the far-field values are at a lower resolution (lower dB).