EM Wave Absorbers Protecting Biological and Medical Environment - RF/Microwave Interaction with Biological Tissues - page 228

1500

1000

500

0 1.0 2.0

Coil current I (A)

FIGURE 5.30 Relation between coil current and static magnetic field.

Conductive plate
(Nonmagnetic) Magnet

Ferrite

FIGURE 5.31

Method for controlling intensity of H dc .

advantage that a static magnetic field which is applied by a magnet is not
strictly regulated. This is because the H dc field necessary for controlling the
matching characteristic is obtained only by adjusting the thickness of the con-
ductive material between the ferrite and the magnet.