Comment by peter_d_sherman

>"Using just two components — a

high-speed [1N5711] Schottky diode

and an LED — you can build a tiny “crystal detector” that responds to

2.4 GHz

Wi-Fi, Bluetooth, and even microwave..."

That is interesting!

I never knew that a Schottky diode could rectify at 2.4 GHz -- that's pretty darn impressive!