• Constant radiation characteristics for log-periodic dipole array antennas 

      Lehmensiek, Robert; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2014)
      Given the correct terminal voltages on each element of a log-periodic dipole array constant radiation characteristics can be achieved for an omni-directional radiation pattern. In this communication it is shown that this ...
    • Modeling of the radiation pattern of a pair of thin circular-arc dipoles over an infinite ground plane 

      De Villiers, Dirk I. L.; Lehmensiek, Robert (Institute of Electrical and Electronics Engineers, 2013)
      This communication presents a model of the radiation pattern of two circular-arc dipoles above an infinite perfectly electrically conducting ground plane. A Fourier expansion is used to describe the currents on the wires, ...
    • Multivariate adaptive sampling of parameterized antenna responses 

      Mutonkole, Ngoy; De Villiers, Dirk I. L. (Institute of Electrical and Electronics Engineers, 2017)
      ENGLISH ABSTRACT: We present a robust method to adaptively construct parameterized models of the full radiation patterns of antennas and the associated S-parameters. The method sequentially selects points (geometric ...
    • Parametric modeling of radiation patterns and scattering parameters of antennas 

      Mutonkole, Ngoy; Samuel, Elizabeth Rita; De Villiers, Dirk I. L.; Dhaene, Tom (Institute of Electrical and Electronics Engineers, 2016)
      This paper describes a data-driven method to model the radiation patterns (over a large angular region) and scattering parameters of antennas as a function of the geometry of the antenna. The radiation pattern model consists ...