A Method for Evaluating Door Structure of Microwave Oven

Kouta MATSUMOTO  Osamu HASHIMOTO  Kouji WADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.11   pp.1997-2000
Publication Date: 2004/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
Keyword: 
microwave oven,  combined waves,  FDTD method,  shielding effectiveness,  

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Summary: 
In this paper, the amplitude coefficient in each mode of leakage waves is calculated by using the amplitude level of the electric field about these unwanted waves under Ministry of Economy, Trade and Industry (METI) definition for measuring the leakage waves irradiated from door portion at the time of microwave oven manufacture, and the percentage of each mode included in leakage waves is also calculated by using finite difference time domain (FDTD) method. Furthermore, shielding effectiveness (SE) of choke structure for suppressing the leakage waves is calculated using combined waves composed of higher order modes as each percentages. As a result, the percentage of each mode included in the leakage waves is examined quantitatively. The approximation analysis for the SE of the choke structure can also be carried out. Therefore, efficient method for evaluating the door structure of the oven at the time of manufacture has been established without the use of the memory in the calculation.