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A microwave oven uses dielectric heating to cook food.. Dielectric heating, also known as electronic heating, radio frequency heating, and high-frequency heating, is the process in which a radio frequency (RF) alternating electric field, or radio wave or microwave electromagnetic radiation heats a dielectric material.
A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating .
A microwave oven passes microwave radiation at a frequency near 2.45 GHz (12 cm) through food, causing dielectric heating primarily by absorption of the energy in water. Microwave ovens became common kitchen appliances in Western countries in the late 1970s, following the development of less expensive cavity magnetrons. Water in the liquid ...
The radiation produced by a microwave oven is non-ionizing, similar to visible light or radio waves. It therefore does not have the cancer risks associated with ionizing radiation such as X-rays and high-energy particles, nor does it render the food radioactive. All microwave radiation dissipates as heat.
LC circuit equivalent for microwave resonant cavity. Microwave resonant cavities can be represented and thought of as simple LC circuits, see Montgomery et al pages 207-239. [15] For a microwave cavity, the stored electric energy is equal to the stored magnetic energy at resonance as is the case for a resonant LC circuit.
Microwave ovens are not tuned to any specific resonant frequency for water molecules in the food. They cook food via dielectric heating of polar molecules, notably water and fats. Microwave ovens do not cook food from the inside out. 2.45 GHz microwaves can only penetrate approximately 1–1.5 inches (2.5–3.8 centimeters) into most foods.
The most common problem exhibited by dielectric resonator circuits is their sensitivity to temperature variation and mechanical vibrations. [8] Even though recent improvements in materials science and manufacturing mitigated some of these issues, compensating techniques still may be required to stabilize the circuit performance over temperature ...
Small antennas and other small components are made possible by microwave frequency applications. The size advantage can be considered as part of a solution to problems of space, or weight, or both. Microwave frequency usage is significant for the design of shipboard radar because it makes possible the detection of smaller targets.
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