When you turn on your microwave, do you lose the Wi-Fi signal to a nearby device? Wi-Fi and microwaves operate on a similar frequency, which can lead to interference.
In 1947, the International Telecommunication Union (ITM )created the ISM bands, Industrial, Scientific, and Medical.
The goal was to determine which devices would be allowed to use specific radio frequency bands, so that they would not cause interference to other radio communications services.
ITM designated the 2.4 GHz band as a spectrum specifically for microwave ovens. This band does not require much power for transmission, and can heat food at relatively lower power. This naturally reduced the cost for the consumer.
As the name ISM suggests, it was originally intended to be used only in non-communication devices. But since then, cordless phones, walkie-talkies, and more recently, Wi-Fi have come along. The 2.4 GHz band was ideal, with low cost, lower power requirements, and decent range capabilities.
Anything running in the ISM bands is supposed to be designed to avoid interference, and Wi-Fi devices use algorithms to do so. However, a microwave oven is quite powerful and can interfere with nearby WiFi signals.
Microwave ovens have a “shield” to prevent leakage, but no matter how we do it, it is not Faraday. So it is not uncommon for there to be some leakage in a microwave oven.
Microwaves and Wi-Fi devices use a similar frequency that can interfere with each other. Your WiFi will not naturally exhibit anything noticeable in the microwave, due to its “shielding.”
WiFi and microwaves use a similar radio frequency, but there are two important differences: focus and power.
A Wi-Fi router sends its signal everywhere. It sends it in every direction in an imaginary circle.
A microwave oven, on the other hand, sends its signal in only one direction, roughly toward the center of the oven. This signal continues until it hits the sides or bottom of the oven, bounces off, and returns at a slightly different angle.
It's not a perfect system, due to the nature of radio waves, and so every microwave oven has hot and cold spots. That's why ovens have turntables.
Microwaves also use more power than a Wi-Fi router. They typically produce 1000 watts of power. Conversely, a typical Wi-Fi router produces about 100 milwaves (or 0.1 watts).
If you notice interference problems, you don't need to replace your microwave. The leakage is likely minimal and not harmful to you or those around you.
Wi-Fi is much more sensitive and doesn't need much to pick up interference. Instead of replacing your microwave, you could simply move it.
Alternatively, use another frequency on your Wi-Fi (5ghz). Not only will you avoid interference from the microwave, but you will also prevent interference from your neighbors.
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