I have evaluated AD8361ART-Eval evaluation board of rms power detector.
I have modified it for frequency band of 1.0MHz to 30MHz
As per AD application note, I replaced the coupling capacitor C1 to 1nf. which results in a HPF with lowest freq of 700KHz.
check attached excel sheet for the measurements at various freq spots.
There is a gap between a response curve (RF in and Vout) for 1MHz and other higher frequency spots.
I want to reduce this gap so that I get almost similar response across the 1.0MHz to 30MHz for particular frequency spot and Rf in power.