Thanks all, I assumed it was a filter myself since it had the "waffle-iron" appearance. What you see tapering inward on the video goes to the mid-point of the waveguide (between the front two and rear two tuning slugs) and it then tapers back outward again.
There are numbers on the side but I...
The "slit" is open, about 1mm wide and runs the long-length of the x-band wave guide. I'm not sure what you mean by "open to the air". The slit is inside the waveguide. It's like the wave guide tapers down to the slit and then tapers back up again on the other side of the slit to full size...
All, I am trying to identify a section of waveguide. It is X-band. Looking into the waveguide from one end you can see that it tapers with what looks like steps (for lack of a better term) into a small slit about 1mm wide halfway into the waveguide. On the other side of the slit, it expands...
