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Input impedance change of a half-wave vertical antenna over a dissipative earth

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2 Author(s)
Olsen, R. ; Univ. of Colorado, Boulder, CO, USA ; Chang, D.

The problem investigated here is that of calculating the input impedance of a thin vertical center-fed half-wave dipole over a dissipative ground. A variational expression for the input impedance is found which is valid for heights above the ground as small asdlambda = 0.3(in many cases the limit is smaller than this) and for refractive indices such that|n|^{2} geq 10. Using a zeroth-order trial function, a closed-form expression which represents the change in the input impedance of the antenna between the case of a perfectly conducting ground and the case of a dissipative ground is found.

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Antennas and Propagation, IEEE Transactions on  (Volume:19 ,  Issue: 5 )