Zobrazeno 1 - 10
of 112
pro vyhledávání: '"Dirk I. L. De Villiers"'
Publikováno v:
2023 International Microwave and Antenna Symposium (IMAS).
Publikováno v:
IEEE Transactions on Antennas and Propagation. 69:8282-8290
Autor:
Tinus Stander, Dirk I. L. de Villiers, Aletha de Witt, Daniel Ferrusca Rodriquez, David Hiriart, Stanley E. Kurtz, Fanie van Den Heever, Miguel Velazquez de La Rosa Becerra
Publikováno v:
2022 International Conference on Electromagnetics in Advanced Applications (ICEAA).
Publikováno v:
2022 International Conference on Electromagnetics in Advanced Applications (ICEAA).
Autor:
Rob Maaskant, Anders Stjernman, Dirk I. L. de Villiers, Tomislav Marinovic, D.J. Bekers, Martin Johansson, Guy A. E. Vandenbosch
Publikováno v:
IEEE Transactions on Antennas and Propagation. 69:206-218
A new method is proposed to analyze antenna arrays including mutual coupling, which is based on the concept of multiple scattering and relates to the iterative Jacobi and Gauss-Seidel methods. The method employs sampled far-field data of an isolated
Publikováno v:
Experimental Astronomy. 51:1-16
The new generation radio telescopes, such as the Square Kilometre Array (SKA) currently under construction, will use aperture array, technology for the low frequency regime. For SKA2, the second phase scheduled after the realization of SKA1, aperture
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 68:2531-2538
A new passively isolated $N$ -way radial combiner design is proposed. The design incorporates low-loss partially filled radial combiners with a passive peripheral isolation network, where coaxial termination loads are used as isolation resistors. To
Autor:
Mariet Venter, Dirk I. L. de Villiers
Publikováno v:
2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI).
Publikováno v:
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
This paper presents an investigation into the practical performance of a direction of arrival (DOA) estimation method for sparse regular arrays, called VEXPA. Its ability to estimate the number of incoming signals through cluster analysis is compared
Autor:
Annie Cuyt, Stefan J. Wijnholds, Ridalise Louw, Ferre Knaepkens, Dirk I. L. de Villiers, Wen-shin Lee, Rina-Mari Weideman
Publikováno v:
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
Accurate placement of elements in large antenna arrays is a difficult and costly process. We explore the use of the validated exponential analysis (VEXPA) technique that was previously formulated to solve a direction-of-arrival (DOA) estimation probl