Microwave-heating applicators 3: resonant structures
Except for plasma generation, resonant systems have not been widely used in production industry because of the difficulties of control. As the workload properties and other parameters of the system change with temperature and wear, both the cavity resonant frequency and the generator frequency drift, and power transfer falls. It is necessary to retune to restore the correct operation point, and in most cases this is required so frequently as to demand an automatic system. In the past, automatic frequency control has been difficult to accomplish reliably in a normal production environment, but this situation has now changed with the advent of microprocessor control systems. It is worth observing that plasma generation is a recent and important development of microwave heating in a very high-technology application where production is in the hands of highly qualified operators who readily understand frequency-control systems.This chapter is a review of the basic principles of resonant-system operation with particular emphasis on practical features. Design procedures are adequately described elsewhere (Metaxas and Meredith, 1993).
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