AGC working at high frequency

i want to built a AGC with a rf detector and a VGA working at frequency 7-8GHz.But i see from the detector (AD8318 ADL5902 etc)datasheet that the output voltage is different for different frequencies with the same power.The difference is large especially at higher frequency (7-8GHz)So the output power of the AGC will vary with frequency.

What should I do to solve this problem?

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