(3) The free space is truncated by a scattering boundary
condition.
(4) The model assumes that dielectric properties of each tissue
are uniform and constant.
The electromagnetic wave propagation in a human head is calculated
using Maxwell’s equations [11,15], which mathematically
describe the interdependence of the electromagnetic waves. The
general form of Maxwell’s equations is simplified to demonstrate
the electromagnetic field penetrated in human head as the following
equation:
r 1
lr
r E k2
0erE ¼ 0 (1)
where E is electric field intensity (V/m), lr is relative magnetic
permeability, er is relative dielectric constant, and k0 is the free
space wave number (m1
).
3.2.1 Boundary Condition for Wave Propagation Analysis.
Electromagnetic energy is emitted by the patch antenna and
strikes the human head with a particular radiated power. The
lumped port where it used to define a voltage drop across two
patches is placed between the two patches at the bottom of the
patch antenna in order to generate an electromagnetic field. Therefore,
the boundary condition for solving electromagnetic wave
propagation, as shown in Fig. 3, is described as follows:
(3) The free space is truncated by a scattering boundary
condition.
(4) The model assumes that dielectric properties of each tissue
are uniform and constant.
The electromagnetic wave propagation in a human head is calculated
using Maxwell’s equations [11,15], which mathematically
describe the interdependence of the electromagnetic waves. The
general form of Maxwell’s equations is simplified to demonstrate
the electromagnetic field penetrated in human head as the following
equation:
r 1
lr
r E k2
0erE ¼ 0 (1)
where E is electric field intensity (V/m), lr is relative magnetic
permeability, er is relative dielectric constant, and k0 is the free
space wave number (m1
).
3.2.1 Boundary Condition for Wave Propagation Analysis.
Electromagnetic energy is emitted by the patch antenna and
strikes the human head with a particular radiated power. The
lumped port where it used to define a voltage drop across two
patches is placed between the two patches at the bottom of the
patch antenna in order to generate an electromagnetic field. Therefore,
the boundary condition for solving electromagnetic wave
propagation, as shown in Fig. 3, is described as follows:
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