Formation of Electromagnetic Fields by Regular and Biconical Dipoles with Constant and Variable Distributed Surface Impedance under Conditions of Arbitrary Excitation

Using a thin wire approximation, a numerical and analytical solution was obtained for the problem of current distribution in regular and biconical dipoles with constant and variable distributed surface impedance and arbitrary excitation located in free space. The input characteristics and radiation fields of the given antenna structures have been investigated. The reliability of the solution has been confirmed by the satisfactory agreement between the experimental and numerical results, with known literature sources, and by comparison with calculated data obtained using commercial software packages. Numerical results are presented for the input admittance, the reflection coefficient in the feed line, and electromagnetic fields excited in the surrounding space by dipoles with symmetrical and asymmetrical distributed surface impedance.