Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2016 - zeszyt 1

Efficient Electromagnetic Simulation of Shielding Mechanisms in Microwave Ovens

10.15199/13.2016.1.1

Marc Rütschlin

nr katalogowy: 96274
10.15199/13.2016.1.1

The door to a microwave oven forms part of the heating cavity, allowing access to the oven interior. The seal around the door is never perfect, so electromagnetic fi elds will leak out of the oven, potentially interfering with other electrical equipment or exceeding safety limits for power levels in human operators. Oven designs have to meet legal requirements for the amount of power which can leak beyond a certain distance from the oven (due to human exposure concerns), and also have to meet electromagnetic compatibility (EMC) requirements. This article discusses how electromagnetic simulation can be used to design effective shielding mechanisms in order to adhere to these standards. Microwave heating is caused by the interaction of a high -frequency electromagnetic field with a dielectric. Common uses of microwave heating include cooking, drying and sterilization - all effects that can be dangerous or destructive outside the controlled environment of the heating cavity. To prevent injury tooperators, microwave ovens need to be well-shielded to preventleakage of RF fields. Different regulatory bodies set different exposure limits and specify different experimental set-ups. A few examples are givenin Table 1:Another reason to improve microwave oven shielding is electromagnetic compatibility (EMC). Electromagnetic fields produced by the oven can couple into other electronic devices, causing spurious signals and potentially damaging the device. To complicate matters, most domestic microwave ovens operate on the industrial, scientific and medical (ISM) band at around 2.45 GHz. Because this band is unregulated, it has become widely used for short range wireless communication systems such as Wi-Fi and Bluetooth. Noise from microwave ovens can cause significant interference to networks using these technologies.If a microwave oven consisted solely of a sealed heating cavity, shielding it would be trivial. However, practical conside[...]

Bibliografia

[1] IEC 60335-2-25,“Household and similar electrical appliances. Safety - Part 2-25: Particular requirements for microwave ovens, including combination microwave ovens".
[2] 21CFR1030.10 “Performance standards for microwave and radio frequency emitting devices - Microwave ovens", U.S. Food and Drug Administration. http://www.accessdata.fda.gov/scripts/ cdrh/cfdocs/cfcfr/CFRSearch.cfm?FR=1030.10
[3] “Ordinance Concerning Technical Requirements for Electrical Appliances and Materials (Electrical Appliance and Material Safety Law)", Section 95, Ministry of Economy,Trade and Industry (Japan).
[4] “Radiation Emitting Devices Regulations (C.R.C., c. 1370)", Schedule II, part III, Department of Justice (Canada). http://lawslois. justice.gc.ca/eng/regulations/C.R.C.,_c._1370/page-4.html
[5] “Microwave ovens", EMF Fact Sheet, Federal Office of Public Health (Switzerland). http://www.bag.admin.ch/themen/strahlung/ 00053/00673/03752/index.html?lang=en

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