Design of High Power Transmission Line Transformer for RF Heating Generator

In this paper, presented design method of 1:4 transmission line transformer (TLT) at the high power base of coaxial cable surrounded a ferrite core and compensation element used for improve return loss. The model for 1:4 TLT used in matching impedance at 39 MHz of push-pull power amplifiers (PAs) with insertion loss approximately -3 dB, return loss lower -40 dB and different phase shift about 180° are presented.