How can i create a SWR meter that works for 0dBm sources @ 2.4Ghz?
The host has another project, Field Strength Sensor for Wifi ISM band (2.4 GHz), that incorporates a preamplifier. WiFi signals are &lt;5mW (&lt;7dBm) broadcast, so this must be picking up &lt;&lt;5mW.

I don't see a reason why you couldn't adapt this preamp stage into the bridge of the SWR meter. The host uses a diode detector in the bridge; you would want to swap out the diode and everything to the right of it in his/her diagram. Resistor values all seem sensible; I'm not sure about the caps.

Disclaimer: I am not an RF engineer! I have made a few GHz amps and played with some microwave structures, but I certainly can't guarantee this will work. (It certainly sounds like fun, though!)