EM cosim ADS Problem of a diode detector

Hi,
I have a problem of Circuit simulation in an em model. I have attached a Diode detector ckt in the schematic view of transmission line as as well in Cosim view.
My results in the schematic view of TL is as expected i.e as power input increases Voltage is increasing. But in my Cosim its entirely opposite or to say rectification voltage is negative near the diode(positive terminal).
I don't know whats this em model doing in the simulation.
please help me.

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