Publications

Barth, MJ, Mcleod, RR & Ziolkowski, RW 1992, 'A Near and Far-Field Projection Algorithm for Finite-Difference Time-Domain Codes', Journal of Electromagnetic Waves and Applications, vol. 6, no. 1-6, pp. 5-18.
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The class of problems to which the Finite-Difference Time-Domain (FDTD) method can be applied is extended through the use of near and far-field projection techniques. These methods are developed by applying the equivalence principle to a surface within the FDTD problem space. Algorithms are found to project the equivalent electric and magnetic currents on this surface to any point in space either in the time or the frequency domains. A summary of extensive validation and error checking results is presented which shows the routines to be robust and accurate to within a few percent. As a result, the FDTD approach can be applied to a number of previously impractical problems. © 1992, VSP. All rights reserved.

BARTH, MJ, MCLEOD, RR & ZIOLKOWSKI, RW 1992, 'A NEAR AND FAR-FIELD PROJECTION ALGORITHM FOR FINITE-DIFFERENCE TIME-DOMAIN CODES', JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, vol. 6, no. 1, pp. 5-18.

Barth, MJ, McLeod, RR & Ziolkowski, RW 1992, 'A near and far-field projection algorithm for finite-difference time-domain codes', Journal of Electromagnetic Waves and Applications, vol. 6, no. 1-4, pp. 5-18.
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The class of problems to which the Finite-Difference Time-Domain (FDTD) method can be applied is extended through the use of near and far-field projection techniques. These methods are developed by applying the equivalence principle to a surface within the FDTD problem space. Algorithms are found to project the equivalent electric and magnetic currents on this surface to any point in space either in the time or the frequency domains. A summary of extensive validation and error checking results is presented which shows the routines to be robust and accurate to within a few percent. As a result, the FDTD approach can be applied to a number of previously impractical problems. © 1992 VSP.

Bird, TS & Sroka, C 1992, 'Design of the KU-band antennas for the Galaxy HS601C satellites', Journal of Electrical and Electronics Engineering, Australia, vol. 12, no. 3, pp. 267-273.
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Outcomes of a study undertaken by CSIRO on the six possible shaped beams for the Galaxy HS601C satellites are described. These satellites will provide C- and Ku-band communications to continental USA and neighbouring islands. Of especial concern in the study was the effect on performance of mutual coupling between the multi-mode horns in the feed arrays for the reflectors which generate the shaped beams. Mutual coupling influences the reflection coefficient at the horn inputs as well as the directivity of the shaped beam. After a brief description of the antenna geometry, methods used to analyse the antennas are outlined. Results are presented for possible antenna designs with and without mutual coupling in the feed array. We describe some techniques employed to optimize the array beamforming networks. Due to practical considerations it was possible to change only some of the beamforming network couplers and the impact of shaped beam design with a reduced set of couplers is discussed.

DONNELLY, R & ZIOLKOWSKI, R 1992, 'A METHOD FOR CONSTRUCTING SOLUTIONS OF HOMOGENEOUS PARTIAL-DIFFERENTIAL EQUATIONS - LOCALIZED WAVES', PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, vol. 437, no. 1901, pp. 673-692.
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Guo, YJ & Barton, SK 1992, 'A High-Efficiency Quarter-Wave Zone Plate Reflector', IEEE Microwave and Guided Wave Letters, vol. 2, no. 12, pp. 470-471.
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A multilayered quarter-wave zone plate reflector antenna operating in the microwave range is presented. The theory for designing the reflector and experimental results are given. An efficiency of 55% was obtained with a prototype reflector antenna. © 1992 IEEE

HERNANDEZ, JE, ZIOLKOWSKI, RW & PARKER, SR 1992, 'SYNTHESIS OF THE DRIVING FUNCTIONS OF AN ARRAY FOR PROPAGATING LOCALIZED WAVE ENERGY', JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 92, no. 1, pp. 550-562.
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Veitch, D 1992, 'Windows of stability in control chaos', Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on, vol. 39, pp. 808-819.

VENGSARKAR, AM, BESIERIS, IM, SHAARAWI, AM & ZIOLKOWSKI, RW 1992, 'CLOSED-FORM, LOCALIZED WAVE SOLUTIONS IN OPTICAL FIBER WAVE-GUIDES', JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, vol. 9, no. 6, pp. 937-949.
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ZIOLKOWSKI, RW 1992, 'Author of: ZIOLKOWSKI, Richard W (Rick)', J. Opt. Soc. Am. A, vol. 9.

ZIOLKOWSKI, RW 1992, 'PROPERTIES OF ELECTROMAGNETIC BEAMS GENERATED BY ULTRA-WIDE BANDWIDTH PULSE-DRIVEN ARRAYS', IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 40, no. 8, pp. 888-905.
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ZIOLKOWSKI, RW & JUDKINS, JB 1992, 'PROPAGATION CHARACTERISTICS OF ULTRAWIDE-BANDWIDTH PULSED GAUSSIAN BEAMS', JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, vol. 9, no. 11, pp. 2021-2030.
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Guo, YJ & Barton, SK 1992, 'Flat printed zone plate antennas for DBS reception', IEE Conference Publication, pp. 355-358.
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A systematic investigation on flat printed phase correcting zone plate reflector antennas is presented. A multi-layered structure is proposed and a circular quarter-wave zone plate reflector with 54.8% efficiency is reported. When the zone plate reflector is offset, the circular zones become elliptical ones with their centers moved away successively from where the feed is pointed at. Experimental results on an offset half-wave zone plate reflector is given. Unfortunately, the antenna sidelobe level shown in the paper is much worse than that of the CCIR standard, which presently limits the zone plate reflectors as reception-only antennas. However, more recent experiments have shown that the sidelobes of the quarter-wave zone plate reflectors can be significantly improved by introducing better phase compensation and various approaches are being investigated.

Guo, YJ & Barton, SK 1992, 'On the sidelobe performance of fresnel zone plate antennas', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 2175-2178.
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Ziolkowski, RW 1992, 'Aperture realizations of exact solutions to homogeneous wave equations', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), p. 80.
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Ziolkowski, RW 1992, 'Ultra-wide bandwidth, multi-derivative radar systems', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 1241-1244.
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