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Microwave Oven Interference on Wireless LANsAbstract - Commercial microwave ovens as applied inrestaurants have two magnetron tubes and comparedto domestic kitchen counterparts they spread thehigher RF power and radiated heating energy moreevenly. The domestic kitchen or residential microwaveovens have only one magnetron tube. The interferencefrom the commercial type of microwave ovens is moredifficult to characterise than the interference from theresidential ones. The commercial type of microwaveovens radiate a CW-like interference that sweeps overtens of MHz during the two bursts per mains powercycle. The residential ones give a CW-like interferencethat has a more or less stable frequency near 2.45 GHzoccurring once per mains power cycle. The impact ofthe interference from the commercial type ofmicrowave ovens on wireless LANs conforming theIEEE 802.11 standard for both DSSS (direct sequencespread spectrum) and FHSS (frequency hoppingspread spectrum) has been evaluated.The release of the 2.4 GHz unlicensed band (2400 -2483.5MHz) for ISM (industrial, scientific, medicalapplications) prompted a significant interest in the design
In order to capture the oven activity over a full mainspower cycle, we have selected a lower sampling resolutionfor the digital oscilloscope. At last, theinterference from the commercial microwave ovens onwireless LANs based on DSSS and FHSS is measuredwith a dedicated set up and the impact of the interferencenature is considered. Interference from extraneoussources (unintentional radiators) impacts the reliability ofcommunication in this 2. In an attempt to measure the max-hold spectrum for acommercial microwave oven, we found a characteristic asshown in Fig. IEEE Fourth InternationalSymposium on Spread Spectrum Techniques &Applications, Sept. With a high speed digitaloscilloscope it can be shown, that during the active periodthe emitted signal is a CW with a frequency that movesover a few MHz. Zero-span spectrum for residential microwaveoven. Varanasi, "Reliablewireless telephony using 2. At first, published material on residential microwaveovens, the reports from the NTIA (NationalTelecommunications and Information Administration, inthe US) - [1] and [2] - are discussed. Although there are many differences between theemissions from ovens of different manufacturers, thecentre burst frequency is mostly somewhere around 2450 -2460 MHz, and the sweep goes over 2 - 6 MHz.
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