WHY do I get WIFI reception inside my microwave?
 

So I have a gopro Hero4 with WiFi.

I can see the video on my tablet, and first thing we did was to see if the fridge light really DOES go off when you close the door (It Does)

Next we were just curious so we put it in the microwave (NO we didnt turn it on), but we could see ourselves through the front window even though the door was closed.

I thought that microwave ovens were supposed to block all of the RF......:bonk:

Microwave ovens use around 2.45 Ghz, which can be the same as some Wi-Fi, but there are other higher frequencies that Wi-Fi uses. Maybe the Hero4 is using one of those higher frequencies?

Wow, parties around the Stug house must be a blast!
(I joke but would probably have the damn camera in the weirdest conceivable places)

My WiFi signal gets disrupted when I turn on my microwave. Quite annoying.

Well the GoPro is for either the quadcopter, track days with the BRZ, or the Vintage racecar...So there IS fun to be had.

As for the Microwave: It is supposed to block all microwave frequencies.
Microwave oven freq is at 2.4 GHz, which is a wavelength of about 12 cm (4.75 In).

In theory, the microwave RF shielding should block frequencies on and to either side of the Microwave primary frequency, but seems it isnt.

The freq of wifi is 2.401 to 2.473 GHz.
So the only explanation is (as @Hydaral says) that the WiFi is using some of the higher bands.

The microwave is not a perfect Faraday cage. It's meant to shield the signal enough to keep the field strength below some level determined to cause interference with other devices.

There's a lot of gain at the front end of the receiver.

edit: Wait, aren't you an electrical engineer?

most devices are wireless n nowadays. operate at 5gz frequency.
Older bg protocol is 2.4gz

N works on both the 2.4GHz and 5GHz bands actually - 2.4 tends to have slightly better range, but 5 has less interference typically (since there are a lot more older routers on 2.4 than new ones on 5). 802.11a is 5GHz only, as is 802.11ac, while as you said, 802.11b and 802.11g are 2.4.

Warning: NERD ALERT.

Sorcery.