Shown above is a screenshot from a spectrum analysis performed with Metageek’s Channalyzer. It shows the RF energy leaked from a typical consumer-grade microwave oven as measured from 15 feet away. In this case, it spans about 30 MHz in the 2.4 GHz spectrum, roughly from 2.445 GHz to 2.475 GHz (channels 8-13). When this oven is active, it causes some degradation or even complete disruption to Wi-Fi communications taking place in that frequency range. For example, SNR in a nearby cell using channel 6 will be reduced thus having an impact on throughput and capacity. On the other hand, a nearby cell configured in channel 11 will most likely experience high retry rate or even complete interruption (due to CCA-ED getting triggered).
Eliminating the source of interference (oven) would be the ideal solution to this problem. Unfortunately, that’s not always possible. In those cases, it is important to take into consideration interference sources and work around them when designing a channel plan for a wireless network.
Microwave oven about 4m from AP in Spectrum Exp. mode. Destruction of 2.4 GHz band. pic.twitter.com/lro0T9EAHj
— Mark Williams📎 (@GiantsNerd) November 14, 2016