  In this work, the designs of a single-stage and 2-stage 2.4 GHz power
amplifier (PA) are presented. The proposed PAs have been designed to provide
high gain and improved efficiency using harmonic suppression and optimized
impedance matching techniques. There are two harmonic suppression circuits,
each stage of the PA consists of 2 capacitors and 2 inductors, which will help
to suppress the harmonic frequency for 2.4 GHz. These suppression circuits will
help to enhance the overall efficiency of the PAs. Both the PAs are provided
with a VCC supply of 4.2V. Input and output impedances are matched to 50 ohms.
Simulation and experimental results are presented, where the simulated gain and
power added efficiency (PAE) for single stage PA are 17:58dB and 53%,
respectively. While the experimental gain and PAE are 16:7dB and 49.5%,
respectively. On the other hand, for 2-stages PA, simulated gain comes out to
be 34.6dB and PAE is 55%, while the experimental gain and PAE are 30.5dB and
53.1%, respectively. The final design is being fabricated on the Taconic
printed circuit board (PCB) with a thickness of 0.79mm and the dielectric
constant value of 3.2 and its dimensions are 4.6cm x 3.4cm for single stage and
5.9cm x 3.6cm for 2-stages PA.
