Two-stage harmonically tuned 50 W GaN-HEMT wideband power amplifier

In conjunction with suited terminations of harmonic load impedances, this paper contributes a systematic analysis and design for a high power, high efficiency and broadband GaN-HEMT power amplifier (PA). In terms of improving the previous design in [1], this study is illustrated and characterized throughout a practical design of the two-stage PA under consideration of harmonic load terminations. During the design process, matching networks (MNs) at input, output and between the two stages are maintained. The experimental results of large-signal continuous wave (CW) indicate a performance of 47-48.5 dBm output power with corresponded power gain level of 28.3 dB from 2.0 to 2.8 GHz. The Power-Added-Efficiency (PAE) of the PA is attained from 50-65 %.