Electromagnetic Sealing for Helical Heater Terminal Used in Combination Microwave Oven

Tetsuo KUBOTA  Hideki NAKANO  Kohji KOSHIJI  Eimei SHU  Itsuo KIKUCHI  Kenji SUGIMOTO  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.5   pp.706-708
Publication Date: 1997/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on EMC/EMI Problems in Microwave Frequency Range)
microwave oven,  helical heater,  leakage,  seal,  periodic structure,  

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A new sealing structure for helical heater terminal used in a combination microwave oven is suggested, and its sealing characteristics are investigated. The new structure is simply a conductor tube coaxially covering the heater at the input terminal. With an optimally-designed structure of this type, the transmission coefficient of the heater can be reduced to -41.6 dB at 2450 MHz. When installed in a test set which is running with an output of 500 W at 2450 MHz, the microwave power leaking out from the heater terminal is found to be less than 0.2 mW/cm2.