Impedance characteristics of small loop antennas above a conducting half space

The input impedance of a small loop antenna located above a homogeneous conducting half-space is discussed, with emphasis on the change of impedance resulting from the presence of the dissipative half-space. The occurring Sommerfeld-integrals for the field components of the reaction field are evaluated rigorously by numerical methods, and the impedance characteristics are presented in their dependence on frequency, antenna height and ground conductivity. The dependence of the relative impedance change on the inclination angle is also presented, and in general, the ground reaction is not very sensitive, with the exception being when both the frequency and antenna height are small.