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. This
matching circuit is created with capacitors and inductors.
For achieving an efficient RF-to-dc conversion efficiency
and avoiding unwanted power dissipation, a structure
of low-pass filter (LPF) and a capacitor is employed at
the output of the circuit in order to remove the fundamental
frequency signal and harmonics generated by
the nonlinear characteristic of the diode and smooth the
output dc voltage. According to the competition rules,