A constant power, load independent microwave source

[摘要] ENGLISH ABSTRACT:In the past few years, a need for consulting on microwave heating has surfaced. Since mostspecialised microwave components are imported, this adds a hefty price tag in developing theinfrastructure for such consultation. This thesis looks at the design oflow cost alternatives foruse in the laboratory.A microwave source output with variable output power is often required for consultation. Thecalculation of product costs may also be simplified if the available microwave power isconstant despite load changes.The magnetron as a load was first investigated and a high voltage SMPS was then designed tocontrol the output of the magnetron according to operator / consulting requirements. Toensure adequate feedback of system output and load matching, a dual directional coupler hasbeen designed and implemented.Since the amount of microwave power required has a direct impact on the initial capitalexpenditure, costs need to be kept low by optimising the system. An impedance matchingunit was designed to match the magnetron with the load, saving energy and reducing systemcosts. Through automation, the system will strive for the optimum load condition withoutoperator intervention.

[发布机构] Stellenbosch University