Here is a photo of the coupler as built. I 3D printed the box, which is 50mmW X 50mm L X 28mmH. About 2in by 2in by 1 inch. I box is designed with removable dividers that can be lined with aluminum foil. This didn't work out too well because the aluminum foil tears while tightening the nuts on the BNC connectors.
I did some testing to measure the accuracy of the coupler. It was a little bit disappointing at the high frequencies, however further checking shows that the test setup isn't really good. I'm going to wait until I have some decent interface electronics to measure Vf and Vr, rather than trying to use my scope.
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