What is the minimun power to detect out of the Linear Dynamic Range?
Fo example, at 5.8GHz, the minimun in the linear region is about -37dBm. Can detect -50dBm out of Liner region?
Compensation doesn't seem possible, because for low levels like -45 to -50 dBm, output voltage is hitting the ground rail:
A better solution would be to use an RF amplifier in front of the detector, or use a more sensitive detector, for example ADL5902 or LTC5582. The best choice depends on frequency range and dynamic range requirements.