The magnetron is a device that converts electrical power into microwave radiation. It is constructed with a circular arrangement of cavities that form the anode and a central cathode. When electric and magnetic fields are applied perpendicular to each other, electrons emitted from the heated cathode follow a curved path, interacting with the anode and generating microwave radiation. Magnetrons are used in applications such as microwave ovens, radar systems, lighting, and particle accelerators. However, their operating frequency is not precisely controllable and can vary based on factors like load, current, and temperature.