Transmission line matching effects on the performance of shunt-C/series-tuned and series-L/parallel-tuned class-E amplifiers

The impact that the transmission-line load-network has on the performance of the recently introduced series-L/parallel-tuned class-E amplifier and the classic shunt-C/series-tuned configuration when compared to optimally derived lumped load networks is discussed. In addition an improved load topology which facilitates harmonic suppression of up to 5th order as required for maximum class-E efficiency as well as load resistance transformation and a design procedure involving the use of Kuroda´s identity and Richard´s transformation enable a distributed synthesis process which dispenses with the need for iterative tuning as previously required in order to achieve optimum class-E operation.