Numerical Modeling of Monopoles on Radial-Wire Ground Screens.

摘要

The monopole antenna on a radial-wire ground screen has been particularly resistant to numerical modeling due to the difficulty of treating the effect of the air-ground interface and the large total electrical length of wire involved. Designs are usually based on empirically derived formulas and practices. A moment-method code capable of modeling ground screens and other antennas near to or buried in the ground was developed in the code NEC-3. A version of NEC-3, known as NEC-GS, was then specialized to model vertical monopoles on uniform radial-wire ground screens, taking maximum advantage of the symmetry of the screen and its currents. Some results of this code are presented here to compare the performance of ground screens of varying dimensions and configurations, and to determine optimum design parameters. 5 refs., 4 figs.