1983 年 6 巻 38 号 p. 33-40
To prevent fifth harmonic radiation that leaks from microwave ovens, both problems involving the structure of the vent hole and suppressing leaky waves from the power source line of the magnetron have been experimentally studied and a few ways proposed to eliminate these leaky waves. As to the vent hole, a circular hole of 5 [mm] diameter should be adopted to prevent fifth harmonic leaky waves from microwave ovens, and at the same time, a metallic fan with electromagnetic wave-absorbing sheets attached to its blades should be used to provide ventilation. Second, a new method of winding the wave-absorbing electromagnetic tape around the power source line connected to the magnetron is proposed. This tape, consisting of rubber ferrite backed by metal, is effective in reducing the intensity of a strong spectrum radiated from the power source line by more than 10[dB].