Computer analysis of vertical radiation patterns of dipole panel array antennas

摘要

A GW BASIC computer program has been developed to analyze any azimuth vertical radiation pattern of a dipole panel array antenna, fixed on a square tower structure, under different conditions of horizontal progressive quadrature current phase shifting, mechanical panel displacement, beam tilt, feeding current coefficients (null filling) and asymmetric arrangements with and without panel centering. The final effects are singled out by comparing vertical radiation pattern diagrams corresponding to each condition. The result obtained in regard to simultaneous horizontal progressive current phase and mechanical shift show appreciable variations in the vertical radiation patterns, corresponding to arrays of one or two dipole per tower face (omnidirectional arrangement), while for more elements there is a negligible effect on the main beam, but noticeable changes on the sidelobes. On the other hand, for any omnidirectional arrangements under the forementioned conditions of current phase and mechanical shift, almost no vertical radiation is produced by an array of eight dipoles at 0 degrees along the tower (compensation effect). For an array with binomial current coefficients, almost no changes on the beam pattern has been observed.