![]() ![]() The magnetron was initially an important part of the making of short wavelength radar, especially during the Second World War. The discovery of the cavity magnetron made the production of small enough electromagnetic waves possible. All the same, the primary heating effect of all kinds of electromagnetic fields at both microwave and radio frequencies happens because of the dielectric heating effect since polarized molecules are affected by an electric field that alternates rapidly. This is the phenomenon that is used in modern microwave technology. The heat that comes from microwaves with a wavelength smaller than its cavity results from far-field effects. ![]() The patent brought up the idea of radio frequency heating at a frequency of 10 to 20 megahertz. This is smaller compared with the wavelength of a typical electromagnetic field. It results from near-field effects that are experienced in an electromagnetic cavity. The patent describes low-frequency dielectric heating, which is like induction heating – the outcome of electromagnetic heating. It was therefore proposed to heat such materials simultaneously throughout the volume using the dielectric loss developed in them when they are subjected to a high voltage, high-frequency field. In 1937, Bell Laboratories’ US patent stated that the invention related to heating systems for dielectric substances and the object of the development is to heat such substances evenly and significantly simultaneously throughout their volume. However, not much came from these culinary escapades. By the 1930s, the application of short waves to human heat tissues was in use as medical therapy.ĭuring the World’s fair in 1933 held in Chicago, Westinghouse presented a 10-kilowatt shortwave radio transmitter that cooked potatoes and steak between two metal plates. The first exploitation of high-frequency radio waves for heating materials was initiated by the development of vacuum radio tube transmitters in the 1920s. It was already a well-known fact that radio waves heat dielectric materials and its use in medical and industrial concepts was quite common. Magnetron manufacturers such as Raytheon were eager to find new applications for this technology.Īt that time, the idea of heating food substances using radio waves was not a new phenomenon since Bell Labs, RCA, and General Electric had already introduced the idea and were working on this technology. ![]() The microwave, one of the indispensable kitchen appliances, was an accidental invention.Īs the Second World War came to an end, the market for the magnetron tubes that were used to create microwaves for close range military radar was no longer in use. Related: Natural Microwave Alternatives | Types of Microwave Carts | Large Microwave Oven | Small Microwave Oven History It then increased to 96 percent in 2009 as microwaves enabled individuals to multitask and families began eating together less frequently. This led to about a quarter of American homes owning a microwave by 1986. Japanese and Korean manufacturers entered the scene in the mid-1980s with their smaller and more affordable microwaves. The early versions didn’t catch fire with the American public right away not only because they were sold at a high price tag but also because of safety concerns regarding leaked dangerous radiation. The microwave celebrated its 50th anniversary in 2017. ![]()
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