CALCULATION AND PRECISION-MEASUREMENTS OF DISTORTED RF EMF IN A RECTANGULAR CAVITY RESONATOR

Knowledge of the transmitted power, the loaded quality factor of the c avity and its reflection coefficient allows a calculation of electric and magnetic field vectors in an air-filled rectangular cavity resonat or. The distortion of a homogeneous magnetic field in a spherical samp le with well known electric conductivity sigma and angular frequency o mega could be calculated. The frequency and conductivity dependence of the induced electric field was shown. The electric field distorted by sample characteristics such as geometry and dielectric behaviour has to be measured because the boundary condition of a homogeneous field f ar from the sample necessary to solve Laplace's equation cannot be ful filled. The electric field strength was measured by an extremely short ened insulated dipole probe. In biologically relevant samples with rel ative dielectric constant epsilon > 5 the insulated probe allows one t o obtain results independent of the dielectric properties of the sampl e. Using this probe, a computer-assisted measurement and regulating se t-up could be constructed and tested.