EM Wave Absorbers Protecting Biological and Medical Environment - RF/Microwave Interaction with Biological Tissues - page 243

e r = 12.00
m r = 2.08 - j 1.44

·

6.0 mm

FIGURE P5.1

magnetic material

1.0 mm

e r = 6.0

6.0 mm

FIGURE P5.3

5.4. Calculate the reflection coefficient of a two-layer absorber at 3.0 GHz,
when dielectric material is of thickness 0.5 mm and is on the surface of a
magnetic absorber of thickness 2.0 mm when the relative permittivity of
the dielectric material constant is 6.0 and the relative permeability of the
magnetic absorber m r = 4.0 - j 3.0 with a relative permittivity of 20.

5.5. Calculate the reflection coefficient at 3.0 GHz of a two-layer absorber that
is composed of two magnetic materials with a thickness of 1.0 mm on the
surface of a magnetic material with a thickness of 2 mm in the case of a
normal incident wave. The magnetic material with the thickness of 1.0 mm
has a relative permeability m r

j 1.20 and a relative permittivity of
12.0, while the magnetic material with the thickness of 2.0 mm has a rel-
ative permeability m r =

= 1.6 -

4.0 - j 3.0 and a relative permittivity of 20.0.