| 摘要 |
A microwave source system 1 extracts power in a predetermined microwave frequency band out of thermal noise power generated by a resistor (3) by using filter means (4), amplifies the power through a first amplifier (5) and a second amplifier (7), and outputs the power. The first amplifier (5) is variably controllable in gain and control means (6) controls the gain in such a way as to maintain the intensity of the microwave power output from the first amplifier 5 at a predetermined constant value. The second amplifier (7) has a predetermined gain. The resistor (3) is attached to one of the first amplifier (5) and the second amplifier (7), for example, to the second amplifier (7). Thereby, the resistor (3) receives heat from the amplifier (7). Output of the microwave source system (1) is supplied to, for example, a microwave discharge lamp (2). The microwave source system (1) having the above configuration can be compact and inexpensive without a need for a magnetron or a high voltage power supply.
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