Author:Olwal, TO; Chuku, PN; Lysko, Albert ADate:Mar 2021Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ...Read more
Author:Olwal, TO; Chuku, PN; Lysko, Albert ADate:Mar 2021Antennas are a critical component in any wireless link. The significance of their role continues to grow, together with the rise of machine-to-machine (M2M) communications and telecommunications starting to move from the fourth generation ...Read more
Author:Bowles, BA; Austin, BA; Attwell, CWPDate:Nov 1978The paper outlines the fundamentals of underground radio transmission with particular emphasis on loop antennasRead more
Author:Bowles, BA; Austin, BA; Attwell, CWPDate:Dec 1978The paper describes the properties of matching networks employed which determine the most desirable networkRead more
Author:Du Plessis, WP; Kitching, C; Bin Ghannam, ADate:Mar 2012The effect of allowing shared elements in interleaved thinned arrays is investigated. The sidelobe level (SLL) as a function of the number of shared elements mirrors the SLL of thinned arrays as a function of filling factor because the number ...Read more
Author:Smit, JC; Cilliers, Jacques EDate:Sep 2012Recently, a set of high resolution radar measurements were undertaken in South Africa to gain insight into factors influencing the detectability of submarine masts deployed under realistic operational conditions. The measurements, processing ...Read more
Author:Vogt, DRDate:Sep 2000In this thesis, Radio Tomography is the name of a geophysical technique for imaging the attenuation of high frequency continuous wave radio waves in the plane between two boreholes in the earth. One of the central problems of radio tomography ...Read more
Author:Blaauw, Ciara; Potgieter, Monique; Cilliers, Jacques EDate:Apr 2020Commercial off the shelf antennas make it possible to perform rapid initial system tests and proof of concepts experiments. This paper reports on the antenna performance of a cost effective commercial off the shelf printed Log-periodic antenna ...Read more
Author:Nkosi, MC; Lysko, Albert ADate:Sep 2015Understanding radio wave propagation is important for the design and implementation of reliable wireless communication systems. This paper describes transmission coefficient quantification. Measurements were done by using two antennas placed ...Read more
Author:Lysko, Albert ADate:Jul 2011This paper discusses a numerical investigation in connection with the dependency of the condition number of the impedance matrix on the decomposition of current on a junction with several attached wires (multiplet). It is shown that the ...Read more
Author:Bowles, BA; Attwell, CWPDate:Nov 1979The authors present a computer program which analyses an electrically small loop antenna having a capacitive matching networkRead more
Author:Lysko, Albert ADate:Sep 2012This paper discusses steps towards a low-power beam-switching array antenna suitable for wireless sensor network (WSN) applications. Such an antenna will help to improve the signal to noise ratio (SNR), and thus throughput, latency and other ...Read more
Author:Lysko, Albert ADate:Jun 2009This paper discusses application of the piecewise sinusoidal (PWS) basis function (BF) over a chain of several wire segments, for example as a multiple domain basis function. The usage of PWS BF is compared to results based on the piecewise ...Read more
Author:Pejovic, V; Johnson, DL; Zheleva, M; Belding, EM; Lysko, Albert ADate:Jan 2014White spaces promise to revolutionize the way wireless connectivity is delivered over wide areas. However, large-scale white space networks face the problem of allocating channels to multiple contending users in the wide white space band. To ...Read more
Author:Lysko, Albert ADate:Jul 2016There is a need for work around improving frequency spectrum utilization efficiency to support the South African government targets of 100% broadband by 2020, with tough specifications stated by the National Broadband Policy “South Africa ...Read more