I need to detect power from 2.5 - 6.0 GHz. The linearity of this part vs frequency can be 15 dB? (Detected voltage at 2.5 GHz vs 5.8 GHz) Am I reading the data sheet wrong? Is there a more linear detector across the 2.5 to 6 GHz band? Is there anything I can do on the input to improve the response?