Browsing Research Articles (Electrical, Electronic and Computer Engineering) by Author "Malherbe, J.A.G., 1940-"

Browsing Research Articles (Electrical, Electronic and Computer Engineering) by Author "Malherbe, J.A.G., 1940-"

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  • An asymmetrical dual band bandpass filter 
    Malherbe, J.A.G., 1940- (Wiley, 2017-01)
    A dual band bandpass filter consisting of a cascade of unit elements and shunt connected stepped open and stepped short circuited stubs, is described. The dual passbands can have unequal, asymmetrical width; the stop‐bandwidth ...
  • Bandpass filter with stepped impedance subharmonic stubs 
    Malherbe, J.A.G., 1940-; Mphiwe, Christina (Wiley, 2014-12)
    Structures with shunt stubs in a subharmonic ratio that realize bandpass performance have limited application due to the inherent problem of fixed transmission zero positions in the stopband. By application of the principle ...
  • Double resonant stub bandstop filter with pseudo-elliptic response 
    Malherbe, J.A.G., 1940-; Reid, C.A. (Institution of Engineering and Technology, 2010-04)
    A simple wideband bandstop filter that yields equal ripples in both the pass and stop bands, is described. The filter comprises only of two resonant stubs and a connecting transmission line and has a transmission response ...
  • An elliptically flared waveguide horn 
    Malherbe, J.A.G., 1940-; Katcodia, Y. (Wiley, 2010-09)
    An X-band waveguide horn of which the sides flare by an elliptic function is described. Measurements performed show that the structure exhibits an absence of side lobes in the conventional sense, and that the radiation ...
  • Hybrid superelliptic horn 
    Malherbe, J.A.G., 1940- (Wiley, 2011-11)
    The waveguide horn with elliptic flare has been shown to exhibit superior radiation and impedance properties. In this article, a horn is described that flares with a hybrid superelliptical profile. The radiation patterns ...
  • Pseudo-elliptic bandpass filter with subharmonic stubs 
    Malherbe, J.A.G., 1940- (Institution of Engineering and Technology, 2011-02)
    A simple bandpass filter that approximates equal ripples in both the pass band and the stopband is described. The filter comprises two stubs, resonant at one-half and one-quarter of the centre frequency, respectively, and ...
  • Pseudo-elliptic bandstop filter with 1:2:3 harmonic ratio stubs 
    Malherbe, J.A.G., 1940- (Institution of Engineering and Technology, 2013-01)
    By employing open circuited stubs with a length ratio of 1:2:3 separated by three unit elements, it is shown that a pseudo-elliptic frequency response can be obtained with a compact structure. It has an electrical ...
  • Pseudo-elliptic function bandstop filter with shunt foster sections 
    Malherbe, J.A.G., 1940-; Louw, Johannes J. (Wiley, 2013-08)
    Filters with transmission zeros in the stopband have been shown to have superior rates of cutoff. Conventional Cauer filters give excellent performance but are relatively large and not always practically realizable. In ...
  • Transmission line filters with harmonic parallel foster sections 
    Malherbe, J.A.G., 1940-; Luus, Pierre D.; Uys, Johan C. (Wiley, 2013-08)
    Conventional wideband bandstop filters use Cauer prototypes, but become nonrealizable with Kuroda–Levy transforms for bandwidths of 150% or more. Transmission line filters with harmonic stubs have been shown to be realizable ...
  • Wideband bandpass filter with extremely wide upper stopband 
    Malherbe, J.A.G., 1940- (Institute of Electrical and Electronics Engineers, 2018-06)
    The realization of planar wideband bandpass filters with an extremely wide upper stopband is described. The filter design differs from conventional approaches in which it is based on the choice of a wideband bandstop (BS) ...
  • Wideband bandstop filter with sub-harmonic stubs 
    Malherbe, J.A.G., 1940- (Institution of Engineering and Technology, 2011-05)
    The performance of a wideband bandstop transmission line filter employing a series overlay inductor over two stubs resonating at respectively one half and one quarter of the centre frequency, is described. The structure ...