Browsing by Author "Joubert, Johan"

Browsing by Author "Joubert, Johan"

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  • High-gain directional antenna for WLAN and WiMAX applications 
    Van Rooyen, Marno; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers, 2017)
    This letter presents a dual band slot antenna with high gain for WLAN and WiMAX communication covering the IEEE802.11a/b and IEEE802.16d/e standards. The antenna consists of a microstrip fed slot with a complimentary stub ...
  • High-gain dual-polarised planar slot array for WLAN applications 
    Joubert, Johan; Odendaal, J.W. (Johann Wilhelm); Prinsloo, J. (Institution of Engineering and Technology, 2010-07)
    A high-gain dual-polarised planar etched slot array for use in wireless local area networks (WLAN) is presented. Two sets of four collinear slots are used as radiators for each polarisation. Each set of four collinear ...
  • The implementation of wideband 90° hybrids on non-optimal substrates 
    Du Toit, Johan B.; Joubert, Johan; Odendaal, J.W. (Johann Wilhelm) (Wiley Open Access, 2021-01)
    A new technique to implement wideband 90° hybrid coupling profiles on non-optimal substrate configurations is presented. The technique uses an impedance taper over the whole length of the hybrid to remove the restriction ...
  • An improved design for a 1-18 GHz double-ridged guide horn antenna 
    Jacobs, Bennie; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers, 2012)
    It is a well known fact that the traditional 1-18 GHz double ridge guide horn (DRGH) antenna suffers from pattern deterioration above 12 GHz. At these frequencies, instead of maintaining a single main lobe radiation pattern, ...
  • The measurement of complex antenna transfer functions for ultra-wideband antennas in a compact range 
    Nel, Mariesa; Joubert, Johan; Odendaal, J.W. (Johann Wilhelm) (Institute of Electrical and Electronics Engineers, 2014-12)
    Ultra-wideband (UWB) communications technology increasingly plays an important role in modern communications systems. The complex antenna transfer function (CATF) of an UWB antenna provides valuable information that can ...
  • Proximity coupled fed wideband printed magneto–electric dipole antenna 
    Joubert, Johan; Odendaal, J.W. (Johann Wilhelm) (Wiley Open Access, 2021-10)
    Results are presented fora wideband printed magneto-electric dipole antenna. The printed electric dipole and reflector are separated by an air-gap and is fed with a coaxial transmission line and a printed proximity ...
  • Quad-ridge horn antenna with elliptically shaped sidewalls 
    Jacobs, Ockert Botha; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers, 2013)
    We present a quad-ridge horn antenna as a feed for a reflector antenna for use in radio astronomy applications. The antenna uses elliptically shaped sidewalls to limit the variation of beamwidth over a wide frequency ...
  • Tolerance analysis of cross-eye jamming systems 
    Du Plessis, W.P. (Warren Paul); Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Institute of Electrical and Electronics Engineers (IEEE), 2011-01)
    The matching required between the two directions through a retrodirective cross-eye jammer is considered using both the traditional phase-front analysis and an extended analysis. The design parameters to achieve a specified ...
  • Wideband antenna for 4G MIMO applications 
    Kenny, Caitlin; Odendaal, J.W. (Johann Wilhelm); Joubert, Johan (Wiley, 2017-03)
    A small, wideband, multiple-input-multiple-output antenna is presented for 4G long term evolution (LTE) applications. The proposed antenna consists of a vertically polarized wideband stepped slot, as well as a horizontally ...