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Fig. 2. Components of the dominant transverse-magnetic mode field components, Ez, Er, 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, µr = 1, f = 1 GHz. The axial electric component Ez in the plot is significantly larger than Er 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 Er. Because the absolute values of H and Er only differ by a constant factor, their curves are identical when normalized.
