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The problem with STC (Sensitivity time controlled) based on pin diode.

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Dines

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I'm using STC (Sensitivity time controlled) pin diode for our applications. Attached the schematic diagram below for the reference.
I tried to measure the attenuator range by passing RF signals at input but I noticed 20 dB to 25 dB attenuation happened without applying an external bias current.
In theory, it should not attenuate . It is constantly attenuating at 20 dB to 25 dB even if we apply the external supply current.
What is wrong with this circuit? Can anyone please share your thoughts on this?

WhatsApp Image 2022-05-11 at 11.04.16 PM.jpeg
 
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How are you isolating the control current feed line from the signal path, and are you sure that the diode current is zero or that they are reverse biased.
 

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