FEMU 1.0.4.ty.01005 - RF needs changes

A project log for FEMU - An ESP32 Wi-Fi/Bluetooth board in TOMU form

Just for the sake of making it happen, I've designed an open-source TOMU form factor ESP32 design. It fits in a USB Type-A port.

femtoduinofemtoduino 11/11/2020 at 10:030 Comments

Ok, so after working with Mike M. Volokhov (@mishkathebear on Twitter), it seems design 1.0.4.ty.01005 is a no go for Wi-Fi. If I understood correctly, it resonates at too high a frequency (sorry, I'm still learning). Here's the Smith chart and SWR, MAG plots with the current chip antenna and footprint.

...I will have to make another FEMU revision without the cutout, and attempt to make a more suitable ground plane clearance, perhaps with a different chip antenna.