AD8313 is a Logarithmic Detector which can accurately convert an RF signal at its input to an equivalent decibel-scaled value at its DC output.
The DC output is “linear in dB” with a basic slope of 20mV/dB. The slope can be adjusted in a range from 18mV/dB to 30mV/dB.
The frequency range of AD8313 is between 100MHz to 2.5GHz.
You can make various RF projects like RF signal strength meter, Receive Signal Strength Meter, RF Field Strength Meters, Wave Asborption Meter, and such. Download PDF Application Note for sample projects or search google.