Brain Walker gives an introduction to automatic fixture removal software plug-in (AFR). He discusses how to use the software, what kind of fixtures are and are not suitable for de-embedding with the software. For this setup, we use a C1220 2-Port 20 GHz VNA, as higher frequency leads to higher resolution with the AFR software. To demonstrate measurements, we use both a high-grade fixture and a homemade fixture with end-launch SMA connectors rated to about 3-6 GHz.