http://www.medlabo.com/Home/Watch/2
In this tutorial we'll use HFSS for the first time, so our objectives are: Getting Started with HFSS(creating projects, insert an HFSS design into a project, drawing, assigning materials, boundaries, excitations, ports...) and using HFSS to simulate an air-filled WR-90 waveguide, and also obtain the Field patterns, intrinsic Impedance and wavelength for the first 4 modes.
http://www.medlabo.com/Home/Watch/2