Annual Report 2007
Commission B (Fields and Waves)

Alan Robert Clark

6 May 2008

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1  Active S.A. Researchers and Research Groups

Research that falls under the Commission B ambit is mainly performed at the major universities, and in associated research companies.

1.1  University of Pretoria

The University of Pretoria has an extremely active (and large) research group, and this year has provided 5 journal publications, and 2 conference proceedings.

Much work is done on microwave antenna design and computational electromagnetics.

Main contact details are Prof. Johan Joubert (jjoubert@postino.up.ac.za), Prof Wimpie Odendaal (wodendaa@postino.up.ac.za), Prof JAG Malherbe.

1.2  University of Stellenbosch

Stellenbosch also has an extremely active group, and this year has excelled itself with 12 journal publications and 30 international and local conference proceedings.

There were several M.Sc.'s and two Ph.D.'s produced. Prof Davidson has been given a grant to use the High Performance Computing Center for CEM work, and most of the Stellenbosch team are involved with the SKA initiative.

Main contact details are Prof J Cloete(jhcloete@sun.ac.za), Prof David Davidson(davidson@sun.ac.za), Prof Howard Reader(hcreader@sun.ac.za), Prof. Keith Palmer(palmer@sun.ac.za), Prof Petrie Meyer (pmeyer@sun.ac.za).

1.3  University of the Witwatersrand, Johannesburg

The Computational Electromagnetics Research Group within the School of Electrical and Information Engineering consists of Prof A.R.Clark (AlanRobertClark@gmail.com), and is mainly concerned with the improvement of the theory behind the simulation package SuperNEC.

At present, I have work based on printed antennas, a hybrid FEM/MoM implementation for dielectric patch antennas, and a microwave holography map of the HartRAO Radio Telescope. Additionally, we now have work on parallelising both FEKO and SuperNEC on a Beowulf cluster.

No MSc's were produced in 2007, but three are about to graduate.

Annual Reports of the group are compiled in September and are all to be found on the sitewww.ee.wits.ac.za/~em, or ytdp.ee.wits.ac.za/AnnualReport2007.html.

South African Publications in the field of Commission B—2007

[1]
J W Odendaal, L Botha, and J Joubert. A full scale static radar cross-section (RCS) measurement facility. South African Journal of Science, 103:196–199, May 2007.

[2]
J A G Malherbe and N S Barnes. TEM horn antenna with an elliptic profile. Microwave and Optical Technology Letters, 49(7):1548–1551, Jul 2007.

[3]
J A G Malherbe and P M Malekela. Dielectric wedge antenna with stepped phase correction in a nonradiative mode. Microwave and Optical Technology Letters, 49(8):2030–2032, Aug 2007.

[4]
C Dohmen, J W Odendaal, and J Joubert. Synthesis of conformal arrays with optimized polarization. IEEE Transactions on Antennas and propagation, 55(10):2922–2925, Oct 2007.

[5]
J P Jacobs. Self and mutual admittance of cpw-fed slots on conductor-backed two-layer substrate. Microwave and Optical Technology Letters, 49(11):2798–2802, Nov 2007.

[6]
J P Jacobs, J Joubert, and J W Odendaal. Calculation of mutual admittance between cpw-fed slots on two-layer conductor-backed substrates using reciprocity-based expression. In ICEAA 2007, Turin, Italy, September 2007.

[7]
J A G Malherbe. Design of ultra wideband tem horns. In Proceedings of Asia-Pacific Microwave Conference 2007, Bangkok, Thailand., pages 449–452, December 2007.

[8]
M M Botha. Fully hierarchical divergence-conforming basis functions on tetrahedral cells, with applications. International Journal for Numerical Methods in Engineering, 71(2):127–148, 2007.

[9]
S M Bradshaw, W J Louw, H C Reader, S A Kingman, M Celuch, and W Kijewska. Techno-economic considerations in the commercial microwave processing of mineral ores. Journal of Microwave Power and Electromagnetic Energy, 40(4):228–240, 2007.

[10]
BOTHA MM DAVIDSON DB. Evaluation of a spherical pml for vector fem applications. Ieee Transactions on Antennas and Propagation, 55(2):494–498, 2007.

[11]
MEYER P DE VILLIERS DIL, VAN DER WALT PW. Design of a 10-way conical transmission line power combiner. Ieee Transactions on Microwave Theory and Techniques, 55(2):302–308, 2007.

[12]
READER HC EBERTSOHN NW, GESCHKE RH. Cable trays in emc: Measurement and modeling to 30 mhz. Ieee Transactions on Electronics Packaging Manufacturing, 49(2):1–8, 2007.

[13]
MARAIS N. Driving and extending legacy codes using python. Ieee Antennas and Propagation Magazine, 49(1):140–148, 2007.

[14]
VAN ROOYEN MW PALMER KD. Simple broadband measurements of balanced loads using a network analyzer. Ieee Transactions on Instrumentation and Measurement, 55(1):266–272, 2007.

[15]
MASON IM PALMER KD RÜTSCHLIN M, CLOETE JH. The radio frequency dielectric properties of the stratified ug1-ug2 geological unit in the bushveld complex. Journal of Applied Geophysics, 62(4):345–360, 2007.

[16]
MEYER P SCHOEMAN M. A comparative study on adaptive rational macromodels of highly resonant structures. International Journal of Rf and Microwave Computer-Aided Engineering, 17(3):286–294, 2007.

[17]
VAN DER WALT PW SICKEL T, MEYER P. An in situ tunable diode mounting topology for high power x-band waveguide switches. Ieee Transactions on Microwave Theory and Techniques, 55(2):281–285, 2007.

[18]
DAVIDSON DB SWARTZ JP. Curvilinear vector finite elements using a set of hierarchical basis functions. Ieee Transactions on Antennas and Propagation, 55(2):440–446, 2007.

[19]
VAN DER WALT PW VAN DER MERWE PJ, CLOETE JH. Bipolar waveform generator for time limited response when driving rc loads. Electronics Letters, 43(15):829–830, 2007.

[20]
RYLANDER T BOTHA MM. Error analysis of singularity cancellation quadrature on curvilinear triangles. In 10th International Conference on Electromagnetics in Advanced Applications ICEAA'07, Torino Incontra Congress Center, Torino, Italy, page 4, 2007.

[21]
RYLANDER T BOTHA MM. Numerical evaluation of near-singular integrals on curvilinear triangular domains. In IEEE AP-S International Symposium, Sheraton Waikiki, Honolulu, Hawaii, USA, pages 4837–4840, 2007.

[22]
BOTHA MM. The electromagnetic, volume integral equation method of moments, with curl- conforming discretizations. In IEEE AP-S International Symposium, Sheraton Waikiki, Honolulu, Hawaii, USA,, pages 5628–5631, 2007.

[23]
YOUNG A DAVIDSON DB, BOTHA MM. Progress on radiation boundary conditions for electromagnetic finite element analysis. In 10th International Conference on Electromagnetics in Advanced Applications ICEAA'07, Torino Incontra Congress Center, Torino, Italy, pages 952–955, 2007.

[24]
LEZAR E DAVIDSON DB. Implementation of arbitrarily high order hierarchical vector basis functions for the finite element analysis of a rectangular waveguide. In Africon-07, Windhoek, Namibia, pages 1–7, 2007.

[25]
MEYER P DE VILLIERS DIL. An efficient grid placing technique for 2-d method of moments analysis of coupled line structures. In IEEE Africon 2007, Country Club, Windhoek, Namibia.

[26]
DHAENE T MEYER P DESCHRIJVER D, SCHOEMAN M. Experimental analysis on the relaxation of macromodeling methods. In IEEE Africon 2007, Country Club, Windhoek, Namibia.

[27]
LAUBSCHER E GESCHKE RH. Electromagnetic bandgap structures for printed circuit board emc. In IEEE Africon 2007, Country Club, Windhoek, Namibia.

[28]
DAVIDSON DB MARAIS N. A comparison of some finite element time domain formulations in electromagnetics. In 10th International Conference on Electromagnetics in Advanced Applications ICEAA'07, Torino Incontra Congress Center, Torino, Italy, pages 814–817.

[29]
EBERTSOHN NW BADENHORST PJ JANEZIC MD READER HC, GESCHKE RH. Transfer impedance, emi sensors and hf metrology. In SA IEEE AP/MTT Conference, Technopark, Stellenbosch, 2007.

[30]
MEYER P VALE CAW RIMBI M, READER HC. Characterization of a choke for a microwave applicator. In nternational Microwave Power Institute, IMPI 41st Annual Symposium, Vancouver, Canada, pages 21–2.

[31]
VAN DER WALT PW SICKEL T, MEYER P. Diode mounting topologies for x-band waveguide switches. In IEEE Africon 2007, Country Club, Windhoek, Namibia.

[32]
MEYER P STEYN W STANDER T, VAN DER WALT PW. A comparison of simple low-power wedge-type x-band waveguide absorbing load implementations. In IEEE Africon 2007, Country Club, Windhoek, Namibia.

[33]
VAN NIEKERK PC. VAN DER WESTHUYZEN PJ, FOURIE CJ. An automated system for impedance measurements in milk. In Africon-07, Country Club, Windhoek, Namibia.

[34]
BRAND KF VAN NIEKERK C. The experimental design of linear power amplifiers. In 2007 South African IEEE AP/MTT Conference, Protea Hotel, Stellenbosch, South Africa.

[35]
VAN NIEKERK C DE RAEDT W DERLUYN J GERMAIN M NAUWELAARS BKJC BORGHS G XIAO D, SCHREURS DMM-P. Hybrid gan power amplifier designi. In IMEC, MCP, Kapeldreef, Leuven, Belgium.

[36]
DAVIDSON DB YOUNG A. A comparison of mesh termination schemes for 2d scattering analysis using the finite element method. In Africon-07, Country Club, Windhoek, Namibia.

[37]
BOTHA MM. Singularity cancellation quadrature scheme for curvilinear triangular domains. In 31th Annual Conference of the South African Society for Numerical and Applied Mathematics, Stellenbosch University, Stellenbosch.

[38]
BOTHA MM. The method of moments (mom) - an overview of recent research. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[39]
MASON IM PALMER KD CLOETE JH STEENKAMP J DU PISANI P TROFIMCZYK K BRAY A, SINDLE TG. Using slimline borehole radars from cover holes. In South African Geophysical Association Conference: Book of Abstracts and CD, Wild Coast Sun, Nata.

[40]
DAVIDSON DB. Grand challenge electromagnetic computer simulation for the meerkat and ska. In 2007 National Meeting – Centre for High Performance Computing, CTICC, CTICC, Cape Town, South Africa.

[41]
DAVIDSON DB. Two-dimensional modelling of waveguides using the fem. In 2007 South African IEEE AP/MTT, Protea Hotel, Stellenbosch, South Africa.

[42]
LAUBSCHER E GESCHKE RH. Electromagnetic bandgap structures for emc. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[43]
BADENHORST J LAUBSCHER E READER HC, GESCHKE RH. Issues in calibrating sensors for emi and suppression of unwanted modes. In Southern African Universities Power Engineering Conference, University of Cape Town.

[44]
MARAIS SJ PALMER KD. Dual and circular polarized antennas for space applications. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[45]
VAN DER MERWE M SMITH DMP, DE SWARDT JB. A multi-channel, high bitrate data link for satellite communication. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[46]
VAN DER WALT PW MASON IM VAN DER MERWE PJ, CLOETE JH. Design of a monostatic borehole radar. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[47]
MEYER P VAN DER WALT PW. Design of a 10-way conical transmission line power combiner. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[48]
VAN NIEKERK C. Experimental design of a linear doherty power amplifier. In 2007 South African IEEE AP/MTT Conference, Technopark, Stellenbosch, South Africa.

[49]
VAN NIEKERK C DE RAEDT W DERLUYN J GERMAIN M NAUWELAARS BKJC BORGHS G XIAO D, SCHREURS DMM-P. Hybrid gan power amplifier design.

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