摘要
Reflection and transmission of the plane electromagnetic waves at a frequencyof 2450 MHz at normal incidence on the body surface are studied according to electro-magnetic theory.Our results showed that only 43% electromagnetic energy can penetrateinto the body tissues and 57% electromagnetic energy is reflected back to the air.Thenthe concept of input wave impedance is introduced to study how to decrease the energy re-flection coefficient of the plane electromagnetic waves incident vertically upon the three-layer model of the tissues (skin-fat-muscle).Our results showed that provided the thick-nesses of the skin and fat layers are given,we can evaluate theoretically the thickness andrelative permittivity of the dielectric layer which could raise the energy transmission coef-ficient of the incident waves to 99.99%.
Reflection and transmission of the plane electromagnetic waves at a frequency of 2450 MHz at normal incidence on the body surface are studied according to electro- magnetic theory.Our results showed that only 43% electromagnetic energy can penetrate into the body tissues and 57% electromagnetic energy is reflected back to the air.Then the concept of input wave impedance is introduced to study how to decrease the energy re- flection coefficient of the plane electromagnetic waves incident vertically upon the three- layer model of the tissues (skin-fat-muscle).Our results showed that provided the thick- nesses of the skin and fat layers are given,we can evaluate theoretically the thickness and relative permittivity of the dielectric layer which could raise the energy transmission coef- ficient of the incident waves to 99.99%.
