A novel electric rectifier for use in a rectenna device is provided. The rectenna device can advantageously be used in a variety of applications. The electric rectifier comprises an integrated structure comprising: a diode structure comprising first and second electrodes located in first and second conductive layers respectively and an insulating layer between them, the diode structure being configured and operable for receiving an input signal and generating output signal indicative thereof, and a compensation structure electrically connected in parallel to said diode structure and being configured to compensate the parasitic capacitance of the diode structure when a frequency spectrum of the input signal is beyond the diode's cutoff frequency.