Abstract
Knowledge of the transmitted power, the loaded quality factor of the cavity and its reflection coefficient allows a calculation of electric and magnetic field vectors in an air-filled rectangular cavity resonator. The distortion of a homogeneous magnetic field in a spherical sample with well known electric conductivity σ and angular frequency ω 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 far from the sample necessary to solve Laplace's equation cannot be fulfilled. The electric field strength was measured by an extremely shortened insulated dipole probe. In biologically relevant samples with relative dielectric constant ϵ > 5 the insulated probe allows one to obtain results independent of the dielectric properties of the sample. Using this probe, a computer-assisted measurement and regulating set-up could be constructed and tested.
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