Fig. 2. Components of the dominant transverse-magnetic mode field components, E_z, E_r, H, of the single-rod probe (SRP), normalized with respect to amplitudes at a radius r = 0.005 m (interface between the SRP's copper core and the medium being tested), with _r = 1, µ_r = 1, f = 1 GHz. The axial electric component E_z in the plot is significantly larger than E_r and H, but, depending on frequency and dielectric permittivity, its absolute value can also be several orders of magnitude smaller than its radial electric counterpart E_r. Because the absolute values of H and E_r only differ by a constant factor, their curves are identical when normalized.