Microwave is a kind of oriented electromagnetic radiation wave whose working efficiency is between 300 and 300000 mhz, with the wavelength being 100cm-1.0mm. It was used in the medical treatment in the 1940s and the commenly used frequencies are 433 mhz, 915 mhzíó2450 mhz of which 2450 mhz is used widely in each clinical department.
