Microwave Oven Interference on Wireless LANs
             Abstract - Commercial microwave ovens as applied in
             restaurants have two magnetron tubes and compared
             to domestic kitchen counterparts they spread the
             higher RF power and radiated heating energy more
             evenly. The domestic kitchen or residential microwave
             ovens have only one magnetron tube. The interference
             from the commercial type of microwave ovens is more
             difficult to characterise than the interference from the
             residential ones. The commercial type of microwave
             ovens radiate a CW-like interference that sweeps over
             tens of MHz during the two bursts per mains power
             cycle. The residential ones give a CW-like interference
             that has a more or less stable frequency near 2.45 GHz
             occurring once per mains power cycle. The impact of
             the interference from the commercial type of
             microwave ovens on wireless LANs conforming the
             IEEE 802.11 standard for both DSSS (direct sequence
             spread spectrum) and FHSS (frequency hopping
             spread spectrum) has been evaluated.
             The release of the 2.4 GHz unlicensed band (2400 -2483.5
             MHz) for ISM (industrial, scientific, medical
             applications) prompted a significant interest in the design
             of wireless LAN products. Interference from extraneous
             sources (unintentional radiators) impacts the reliability of
             communication in this 2.4 GHz ISM band. Sources of
             such interference are the millions of residential
             microwave ovens radiating at frequencies close to 2.45
             GHz, and they have been described largely in the
             literature. Commercial microwave ovens, based on two
             magnetron tubes as used in restaurants, have been hardly
             described in the literature. Since commercial ovens are
             expected more often in the vicinity of office buildings
             with a high population density of office equipment and
             PCs, this type has been evaluated with respect to the
             nature of the interference signal and the impact on
             wireless LANs operating ...