Accuracy Evaluation at Calculation of All-Metal Insert Filters with Longtitudal Grooves

The possibility of using traditional (scalar) models of band-pass filters (BPF) of the millimeter range on "all-metal inserts" in design of three-dimensional modifications of such a BPF is estimated. The complication of the filter geometry is associated with the introduction of narrow grooves in each of the resonators, which provide a number of technological advantages in fabrication. It is proved that with all-metal inserts with a thickness of not more than λ/100, the results of the "vector" and "scalar" models completely coincide.