Investigation of the harmonic generation in conventional radio frequency heating systems

This paper investigates the generation of harmonics in conventional radiofr equency (rf) heating systems. An extended circuit model encapsulating the h armonic characteristics of the system is derived using Foster's theorem. Th is model is analyzed using both an analytic and a circuit simulation approa ch. The effect of varying the tuning conditions of the system on the harmon ic power spectrum is investigated for a typical system. This has revealed s ome correlation between the resonant modes of the system and its harmonics which has been postulated in mathematical form as dimensionless factors.