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microwave heating fundamentals

Author: langfeng1 Time: 2017-09-14

Microwaves are electromagnetic waves with frequencies ranging from 300 MHz to 300 GHz. Accordingly, the wavelength of microwaves

ranges from 1 mm to 1 m, which is much larger than molecular (nm) or crystalline grain size (m). Therefore, microwave may

supply energy on valence electrons, yielding electron fluctuation. Microwave can be transmitted, absorbed, or reflected,

depending on the sorts of materials (Fig. 1). When microwave is absorbed in a material, the electron fluctuation is eventually

transferred to lattice ions and generates vibrations in matrix, which can be transferred to heat energy. The heating rate

depends on the electromagnetic properties of a material (complex permittivity and permeability), and the average power

absorbed by a material is the sum of electric loss and magnetic loss.   

Changsha Langfeng Microwave Technology Co., Ltd.


figure: microwave penetration, reflection, absorption


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