Concurrent planar multiharmonic dual-band load-coupling network for switching-mode power amplifiers

Summary form only given, as follows. This work presents a concept to design a compact planar multiharmonic load transformation network (MHLTN) for the realisation of highly efficient dual-band PAs. The proposed MHLTN consisting of only transmission lines can precisely achieve impedance terminations at two distinct frequencies including up to three harmonics. High-impedance stubs are deliberately inserted at particular sections of the network for harmonic termination control. PA measurements show 78.4 % and 61.3 % peak PAE.