The general block diagram of the rectifier of interest
is shown in Figure 1. A band-pass filter (BPF) made
of capacitors and inductors is located at the input of the
circuit, which passes the 900 MHz operating frequency
and reflects the higher order harmonics produced by the
diode. A proper matching circuit is needed to ensure a
good impedance matching between the antenna and
the rectifying circuit for maximum power transfer and
achieving more RF-to-dc conversion efficiency.