Now microwave energy is widely used for techno-logical purposes – drying of vegetables, fruits, preparation of food, welding of dielectric materials, etc. The broad spectrum of experimental and plant installations realizing microwaves technological processes [1] is developed. Their wider spreading is stipulated by a possibility of deriving high quality final product with essential saving of power consumption.

To derive a high level of electromagnetic field intensity in the camera of technological heating the cavity resonators, through which treated materials are transported, are used. However, variable character of resonator load infringes matching of microwave generator with cavity resonator, reducing power saving of technological device.