Basic of Microwave Heating
Author: langfeng1 Time: 2017-06-12
Microwave heating is a process and belongs to the group of electro heat techniques that utilize specific part of electromagnetic spectrum.
These methods supplement or replace (in some Specific cases) the conventional heating systems used in industries. Other members of
the group are induction, direct resistance, infra-red heating and radio frequency. In the electromagnetic spectrum, microwave lie
between infrared radiation and radiowaves with A frequency range of 0.3 GHz to 300 GHz and wavelength from 1um to 100cm.
There are many distinct frequency bands allocated for domestic, industrial, scientific and medical use. However, to avoid interference
with telecommunications frequencies, the Main frequencies are positioned at 896 MHz (915 MHz in the US) and 2.450 GHz with the
corresponding wavelength of 37.24 cm and 12.24 cm respectively. Usually, the shorter wavelengths (2.450 GHz, 12.24 cm) are used
for drying and heating materials in thin layer with large surface area. Whereas the longer wavelength (37.24 cm) which can provide
power up to 100 kW are used for larger process heating because of the ability to penetrate deep into the material. It depicts a
typical electromagnetic spectrum with their frequency range.