Circuits can sometimes be affected by microwaves due to electromagnetic interference (EMI) caused by the microwaves' electromagnetic radiation. Electromagnetic radiation emitted by a microwave oven can interfere with the operation of electronic circuits and devices, leading to malfunctions or disruptions. Here are a few reasons why circuits can go off when hit with microwaves:
EMI susceptibility: Some electronic circuits and devices are more susceptible to electromagnetic interference than others. Components such as sensitive microchips, transistors, or integrated circuits can be easily affected by the strong electromagnetic fields generated by a nearby microwave oven.
Unshielded wiring: Wiring that is not properly shielded or insulated can act as an antenna and pick up the electromagnetic radiation emitted by a microwave oven. This can induce unwanted electrical currents in the wiring, leading to malfunctions or disruptions in the connected circuits.
Proximity to the microwave oven: The closer an electronic circuit or device is to a microwave oven, the stronger the electromagnetic field it will be exposed to. If the circuit is in close proximity, the intensity of the electromagnetic radiation may be sufficient to cause interference or disrupt the circuit's operation.
Frequency overlap: Microwave ovens operate at a frequency of around 2.4 GHz, which is in the same range as some wireless communication devices, such as Wi-Fi routers or cordless phones. If the microwave oven and the electronic circuit or device share the same frequency band, it can lead to interference and disruptions in their operation.
To mitigate the potential interference from microwaves, electronic circuits and devices can be designed with proper shielding and grounding techniques. Shielding materials, such as conductive enclosures or metal shields, can help protect circuits from external electromagnetic radiation. Additionally, keeping a safe distance between electronic devices and microwave ovens can reduce the likelihood of interference.