Millimeter wave antennas
This work required the steady hands of a neurosurgeon. The tolerances were so close and we did not have any of the fancy positioning equipment which is so common today.
The trick was to position a very thin copper coated teflon substrate into an open-ended WR-10 waveguide (which, by the way, is very small)! We wanted to investigate the feasibility of using printed leaky-wave antennas at millimeter wave frequencies. The experiment was at least partially successful, i.e. we were able to get some measured results that corresponded at least partially to what was theoretically expected. We were hampered by the lack of positioning precision of the long waveguide transition within the narrow waveguide, given the flexible nature of the substrate. Hence, we found it difficult to establish how much of the radiation came from the open waveguide and how much actually came from our printed antenna. Have a look at the results in our paper. This work was carried out by myself, my colleagues L. Carin, Q. Xu, S. Borchardt and my advisor K. Webb in my early student days.