Microwave Ovens
You might not think of a microwave oven as a communication device. After all, microwave ovens are designed to cook food—not to transmit data. To heat food, liquids, and make popcorn, a microwave oven transmits RF energy into a sealed cavity. The energy is meant to stay inside the oven where it can penetrate food items.
In practice, the RF shielding around microwave oven doors is not ideal, causing some amount of energy to leak out into the surrounding area. Like many other consumer devices, microwave ovens are free to use the 2.4-GHz ISM band. In fact, most microwaves produce a signal that spreads over a large portion of the band. The signal is simply crudely transmitted energy that does not need to follow any standard or frame ...
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