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BQ25504: used in RF harvesting

Part Number: BQ25504

Hello guys. So I am using this boost in RF harvesting. The boost converter is boosting the voltage whenever I give it input from a rectifier which is connected to a signal generator. But whenever I am placing the rectifier in front of an antenna instead of using a signal generator, the boost converter is not charging the Cbattery at all, although the voltage output of the rectifier was higher than 330 mV.

anyone has any idea what the problem might be? thank you