• Contributions to engineering electromagnetics 

      Davidson, David Bruce (Stellenbosch : Stellenbosch University, 2017-12)
      ENGLISH ABSTRACT: The dissertation presents an overview of the publications of the candidate, and his research group, on engineering electromagnetics — in particular computational electromagnetics (CEM) — which have ...
    • From high-speed superconducting devices to nanosensors 

      Perold, Willem (Stellenbosch : Stellenbosch University, 2017-03)
      ENGLISH ABSTRACT: In this dissertation the story of a research career spanning 34 years is told. It started in microelectronics in the early 1980’s and focused on aspects of design and optimization of high-voltage diodes. ...
    • Miniaturised multilayer RF and microwave Circuits 

      Nassar, Shamim Omar (Stellenbosch : Stellenbosch University, 2016-03)
      ENGLISH ABSTRACT: Ceramic and laminate multilayered technologies are explored in the design of novel circuit topologies and in novel implementations of classical circuit topologies. A cross-slot coupled filter topology ...
    • Modal-based design techniques for circular quadruple-ridged flared horn antennas 

      Beukman, Theunis Steyn (Stellenbosch : Stellenbosch University, 2015-03)
      ENGLISH ABSTRACT: This dissertation presents modal-based techniques for the effective systematic design of quadruple-ridged flared horns (QRFHs) as reflector feeds for radio astronomy applications. A new excitation ...
    • Multi-mode antennas for hemispherical field-of-view coverage 

      Prinsloo, David Schalk Van der Merwe (Stellenbosch : Stellenbosch University, 2015-03)
      ENGLISH ABSTRACT: This dissertation proposes a multi-mode antenna element excited through a multiconductor feed. It is shown that each of the orthogonal transverse electromagnetic modes supported by the antenna feed ...
    • Synthesis methods for multi-band coupled resonator filters 

      Brand, Tobias Gerhardus (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: In this dissertation a number of techniques to design multi-band filters, with specific focus on coupled resonator implementations, is presented. Multi-band transfer functions are constructed from ...
    • Variable bandwidth planar coupled resonator filters utilizing tunable non-resonant node inverters 

      Sharma, Satyam Kumar (Stellenbosch : Stellenbosch University, 2018-12)
      ENGLISH ABSTRACT: This dissertation presents a novel design technique for designing microstrip staircase and pedestal substrate integrated waveguide (SIW) filters with tunable bandwidth. The design technique utilizes ...