What is the fine-grained topic of the following text: Nakmouche, M. F.; Taher, Hany; Fawzy, D. E.; Kahraman, G.
On the way to design Substrate Integrated Waveguide Bandpass Filter (SIW-BPF) for wideband applications a parametric study of the slot geometry etched on a SIW structure is the preliminary step to design such filter. Only return the topic.
Designing Substrate Integrated Waveguide Bandpass Filter with a Parametric Study of Slot Geometry