“…In [53,55], it is demonstrated how the insertion of two transmission lines, with characteristic impedance equal to the load impedance at saturation and of proper length, placed at the output of both the Main and Auxiliary devices, can improve load modulation, and thus both linearity and efficiency. In particular, the offset line at the output of the Auxiliary amplifier forces the necessary almost-ideal open-circuit condition at low power levels, while the one at the output of the Main stage keeps under control the load matching within the whole Doherty region, thus maximizing the power efficiency.…”