I'm developing a proof of concept two port microwave vector network analyzer. The project is under developent. Ongoing documentation and logs are located on a hackaday.io project page.
This project is still under development, y'all probably don't want to try reproducing it yet. Two port measurements to 14 GHz work, a redesign for operation out to 36 GHz is in progress.
See breakouts and hardware for various modules developed for the network analyzer.
See the software directory for scraps of software written for testing VNA modules.
Unless otherwise noted, all work is under a MIT license.
Feel free to contact me at arcticmicrowave@gmail.com or loxodes on irc.freenode.net