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AD8319 Constant Output Voltage


Hi,

I use AD8319 in the receiver to detect if a RF signal at 500 MHz, that I send from the transmitter, is present .
The band pass filter in the receiver board is centered on 500 MHz with 15 MHz band.
When the antenna is not connected I observe 1.6 Volts(approx.) at the output of AD8319 eventhough the transmitter is not powered up.
When the antenna is connected I observe 0.6 Volts(approx.) at the output of AD8319 eventhough the transmitter is not powered up.
And these values are not changing or fluctuating.

What could be the reasons of this ?

The schematic from my board is attached.




Thanks in advance.