The block diagram of a typical rectenna is shown in Fig. 1
and how to produce an integrated design of such a rectenna is a
challenging issue. The rectenna consists of three essential
components: the antenna, the rectifier (diode) and the load. In
most applications, in order to increase the power conversion
efficiency, a low pass filter and DC filter are used and
positioned before and after diode respectively. In our design,
the RF energy in the environment is captured by a broadband
circular dipole antenna which functions as a band pass filter
and mainly the signals around the resonant frequency of
antenna are received. Furthermore, the rectifying device is
Shottky barrier diode which rectifies half-wave of the received
signal. It is important that the Shottky diode can switch quickly
enabling high frequency inputs. Moreover, this diode has low
built in voltage to operate at low microwave input power but it
has limited frequency and voltage operative range because of
the series resistance and the junction capacitor.