A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA

By P. Wright, Jonathan Lees, Johannes Benedikt, P. Tasker, S. Cripps. IEEE transactions on microwave theory and techniques, 2009

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Highly Efficient Broadband Continuous Inverse Class-F Power Amplifier Design Using Modified Elliptic Low-Pass Filtering Matching Network (2016, background): “fundamental and reactive terminations at the harmonics [2].”
Design of Highly Efficient Broadband Class-E Power Amplifier Using Synthesized Low-Pass Matching Networks (2011, methodology): “To date, GaN HEMTs have been applied in numerous high-efficiency broadband PA designs [8]–[12].”
Investigation of a Class-J Power Amplifier With a Nonlinear $C_{\rm out}$ for Optimized Operation (2010, background): “mance of the Class-J PA is degraded due to the phase mismatch, making it comparable to that of a harmonic tuned linear PA, such as a Class-AB or a Class-B, but the reported Class-J PA provides better efficiency than the theoretical expectation [13]–[15].”
Design of a Highly Efficient 2–4-GHz Octave Bandwidth GaN-HEMT Power Amplifier (2010, background): “Therefore, high-efficiency wideband PAs reported in the literature have a bandwidth of less than one octave [10]–[12].”
On the Extension of the Continuous Class-F Mode Power Amplifier (2011, background): “For these two PA modes, the aim is to maintain the required short- and open-circuit harmonic terminations, which, due to practical constraints, must be placed at a distance from the device.”