| 摘要 |
A microwave heating apparatus includes a microwave oscillator, a waveguide for transmitting microwave energy outputted from the microwave oscillator to an object to be heated, detectors for detecting the power of the microwave energy inputted from the microwave oscillator to the object to be heated and the reflected power of the microwave energy reflected from the object to be heated, a matching stub provided in the waveguide, and a driver for driving the matching stub. The driver calculates a VSWR value from the inputted power and the reflected power and includes a motor for driving the matching stub so that the VSWR value is maintained within a predetermined range. Matching of the waveguide impedance with the load impedance can be executed automatically and the VSWR value can be maintained in the range of good matching. Thus, lowering of heating efficiency can be prevented.
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