ON THE GAUSS-SHAPED DIPOLE ANTENNA ABOVE A GROUND PLANE OF FINITE EXTENT
DOI:
https://doi.org/10.4314/njt.v43i4.10Keywords:
Gauss dipole, Landstorfer antenna, Finite ground plane, Front-to-back ratio, Return lossAbstract
This paper investigates the influence of finite ground plane shape and size on the performance characteristics of a thin-wire antenna, whose shape is defined by the normal (Gaussian) probability distribution geometry, and which has been referred to in the literature as the “Gauss-shaped dipole antenna”. In the moment-method (MoM) formulation and solution utilized in the paper for a 1.5l Gauss dipole antenna, the three candidate ground plane shapes considered, namely; square, rectangular, and circular, are modelled by wire-grids. Among a few other interesting properties, the computational results obtained indicate that both maximum achievable power gain and return loss depend on ground plane shape, emerging respectively, as (25.36dB, 47.28dB) for the circular shape; (15.81dB, 27.57dB), for the square shape, and (19.7dB, 34.32dB) for the rectangular shape. The results also reveal that ground plane sizes exhibit significant influence on the antenna’s performance metrics, and support the important conclusion in the literature that for the finite-ground-plane backed Gauss-shaped dipole antenna, one limitation is a characteristic gain / front-to-back- ratio trade-off.
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