What type of device often causes interference across 50% or more of the 2.4 GHz frequency band?

The type of device that often causes interference across 50% or more of the 2.4 GHz frequency band is the microwave oven. Microwave ovens operate at a frequency that is very close to the 2.4 GHz range used by many wireless devices, including Wi-Fi networks and Bluetooth technology. When a microwave oven is in use, it can emit electromagnetic interference that disrupts the signals for devices operating within the 2.4 GHz band.

This interference is significant because it can lead to reduced performance of wireless networks, causing problems such as dropped connections, slower speeds, and increased latency. The design and operating principles of microwave ovens, which include using magnetrons that generate microwave radiation, can result in the leakage of this radiation beyond their intended use, further exacerbating the interference issue.

While other devices like Bluetooth and some wireless printers also operate in the 2.4 GHz spectrum, their interference is generally more localized or less impactful compared to a microwave oven, which can blanket a larger area due to its power and operational characteristics. Wi-Fi routers also contribute to the overall signal in the same frequency range, but they do not inherently cause interference like microwave ovens do.