The behavior of the material in the microwave field can be divided into three types:
1) Microwave Transparent Materials: Mainly low loss insulating material, which allows microwave reflection and partial transmission, but rarely absorbs microwave, such as most polymer materials and some nonmetallic materials.
2) microwave total reflection type material: such materials reflect the coefficient close to 1, such as good electrical conductivity of metal materials.
3) microwave absorption type material: mainly between the metal and the dielectric between the dielectric material.

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