Matthys M. Botha
Professor, Computational Electromagnetics
mmbotha@sun.ac.za | +27 21 808 4318 | EMACS Research Group
In 2002 I obtained a PhD from Stellenbosch University. The main focus was adaptive analysis for hybrid finite element-boundary integral methods. During 2003-2004 I was a post-doctoral research associate within the Department of Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign, USA. During 2008-2010 I worked at EM Software & Systems – S.A. (Pty) Ltd (now Altair), which develops the EM simulation software suite FEKO. In 2011 I joined the Department of Electrical and Electronic Engineering at Stellenbosch University. My research is in the field of computational electromagnetics (CEM) for high-frequency engineering applications.
Research work is focused on aspects of computational electromagnetics (CEM) — i.e. methods for the numerical solution of EM field problems. Typical applications of CEM include the modelling of microwave devices and antenna structures, as well as scattering analysis.
Interests
- Weighted residual methods for CEM: Finite Element Method (FEM), Method of Moments (MoM)
- Hybrid methods
- A posteriori error estimation and adaptivity
- Specialised quadrature schemes
- Tailored integral equation methods for analysis of large arrays
2019
Journals
- FOURIE CJ, JACKMAN K, BOTHA MM, RAZMKHAH S, FEBVRE P, AYALA CL, XU Q, YOSHIKAWA N, PATRICK E, LAW M, WANG Y, ANNAVARAM M, BEEREL P, GUPTA S, NAZARIAN S, PEDRAM M. ColdFlux superconducting EDA and TCAD tools project: overview and progress. IEEE Transactions on Applied Superconductivity 2019; 29(5):1-7.
- NEL BAP, BOTHA MM. An Efficient MLACA-SVD Solver for Superconducting Integrated Circuit Analysis. IEEE Transactions on Applied Superconductivity 2019; 29(7):1-10.
- NEL BAP, BOTHA MM. MLACA With Modified Grouping Strategy for Efficient Superconducting Circuit Analysis. IEEE Transactions on Applied Superconductivity 2019; 29(5):1-5.
Conferences
- CHOSE M, BOTHA MM. Improvements to the Domain Green’s function method for antenna array analysis. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 392-395.
- NEL BAP, BOTHA MM. Performance of MLACA with modified grouping for superconducting circuit analysis. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 404-407.
- SEWRAJ K, BOTHA MM. Computation of MBF Reaction Matrices for Antenna Array Analysis, with a Directional Method. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 385-389.
2018
Journals
- BOTHA MM, RYLANDER T. Analysis and estimation of quadrature errors in weakly singular source integrals of the method of moments. INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS 2018; 31(1):1-19.
- BOTHA MM. Estimating quadrature errors in the EFIE-based MoM matrix, due to inner integrals. IEEE Antennas and Wireless Propagation Letters 2018; 17(8):1449-1453.
- XIANG D, BOTHA MM. MLFMM-based, fast multiple-reflection physical optics for large-scale electromagnetic scattering anaysis. Journal of Computational Physics 2018; 368:69-91.
Conferences
- BOTHA MM, RYLANDER T. An improved quadrature error estimate for nearly-singular MoM integrals. 2018 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting (AP-S/URSI 2018), Boston, USA, IEEE 208: 2431-2432.
- BOTHA MM. Singularity cancellation quadrature scheme development and error characterization. In: Gürel L (ed.) CEMI’18 International Workshop on Computing, Electromagnetics, and Machine Intelligence, Stellenbosch, South Africa, IEEE 2018: 61-62.
- LUDICK DJ, BOTHA MM. Application of dynamically constructed macro basis functions to antenna arrays with interconnected elements. In: Gürel L (ed.) CEMI’18 International Workshop on Computing, Electromagnetics, and Machine Intelligence, Stellenbosch, South Africa, IEEE 2018: 55-56.
- NEL BAP, BOTHA MM. Investigation of Multilevel Adaptive Cross Approximation (MLACA) Acceleration for Superconducting Circuit Analysis. Proceedings of the 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), Cartagena de Indias, Colombia, IEEE 2018: 258-260.
- SEWRAJ K, BOTHA MM. Comparison of macro basis function sets for antenna array analysis with the MoM. 2018 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting (AP-S/URSI 2018), Boston, USA, IEEE 2018: 2357-2358.
- SEWRAJ K, BOTHA MM. Efficiency of various macro basis function schemes for antenna array analysis. Proceedings of the 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), Cartagena de Indias, Colombia, IEEE 2018: 254-257.
2017 and earlier
See the links at the top, to my author profile pages on various online databases.
Mailing address
Department of Electrical and Electronic Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa
Physical address
Room E407, Department of Electrical and Electronic Engineering, Stellenbosch University, Cnr Banghoek Road & Joubert Street, Stellenbosch, 7600, South Africa. See /contact/ for a map.
- Bio
-
In 2002 I obtained a PhD from Stellenbosch University. The main focus was adaptive analysis for hybrid finite element-boundary integral methods. During 2003-2004 I was a post-doctoral research associate within the Department of Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign, USA. During 2008-2010 I worked at EM Software & Systems – S.A. (Pty) Ltd (now Altair), which develops the EM simulation software suite FEKO. In 2011 I joined the Department of Electrical and Electronic Engineering at Stellenbosch University. My research is in the field of computational electromagnetics (CEM) for high-frequency engineering applications.
- Research
-
Research work is focused on aspects of computational electromagnetics (CEM) — i.e. methods for the numerical solution of EM field problems. Typical applications of CEM include the modelling of microwave devices and antenna structures, as well as scattering analysis.
Interests
- Weighted residual methods for CEM: Finite Element Method (FEM), Method of Moments (MoM)
- Hybrid methods
- A posteriori error estimation and adaptivity
- Specialised quadrature schemes
- Tailored integral equation methods for analysis of large arrays
- Publications
-
2019
Journals
- FOURIE CJ, JACKMAN K, BOTHA MM, RAZMKHAH S, FEBVRE P, AYALA CL, XU Q, YOSHIKAWA N, PATRICK E, LAW M, WANG Y, ANNAVARAM M, BEEREL P, GUPTA S, NAZARIAN S, PEDRAM M. ColdFlux superconducting EDA and TCAD tools project: overview and progress. IEEE Transactions on Applied Superconductivity 2019; 29(5):1-7.
- NEL BAP, BOTHA MM. An Efficient MLACA-SVD Solver for Superconducting Integrated Circuit Analysis. IEEE Transactions on Applied Superconductivity 2019; 29(7):1-10.
- NEL BAP, BOTHA MM. MLACA With Modified Grouping Strategy for Efficient Superconducting Circuit Analysis. IEEE Transactions on Applied Superconductivity 2019; 29(5):1-5.
Conferences
- CHOSE M, BOTHA MM. Improvements to the Domain Green’s function method for antenna array analysis. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 392-395.
- NEL BAP, BOTHA MM. Performance of MLACA with modified grouping for superconducting circuit analysis. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 404-407.
- SEWRAJ K, BOTHA MM. Computation of MBF Reaction Matrices for Antenna Array Analysis, with a Directional Method. 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), Granada, Spain, IEEE 2019: 385-389.
2018
Journals
- BOTHA MM, RYLANDER T. Analysis and estimation of quadrature errors in weakly singular source integrals of the method of moments. INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS DEVICES AND FIELDS 2018; 31(1):1-19.
- BOTHA MM. Estimating quadrature errors in the EFIE-based MoM matrix, due to inner integrals. IEEE Antennas and Wireless Propagation Letters 2018; 17(8):1449-1453.
- XIANG D, BOTHA MM. MLFMM-based, fast multiple-reflection physical optics for large-scale electromagnetic scattering anaysis. Journal of Computational Physics 2018; 368:69-91.
Conferences
- BOTHA MM, RYLANDER T. An improved quadrature error estimate for nearly-singular MoM integrals. 2018 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting (AP-S/URSI 2018), Boston, USA, IEEE 208: 2431-2432.
- BOTHA MM. Singularity cancellation quadrature scheme development and error characterization. In: Gürel L (ed.) CEMI’18 International Workshop on Computing, Electromagnetics, and Machine Intelligence, Stellenbosch, South Africa, IEEE 2018: 61-62.
- LUDICK DJ, BOTHA MM. Application of dynamically constructed macro basis functions to antenna arrays with interconnected elements. In: Gürel L (ed.) CEMI’18 International Workshop on Computing, Electromagnetics, and Machine Intelligence, Stellenbosch, South Africa, IEEE 2018: 55-56.
- NEL BAP, BOTHA MM. Investigation of Multilevel Adaptive Cross Approximation (MLACA) Acceleration for Superconducting Circuit Analysis. Proceedings of the 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), Cartagena de Indias, Colombia, IEEE 2018: 258-260.
- SEWRAJ K, BOTHA MM. Comparison of macro basis function sets for antenna array analysis with the MoM. 2018 IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting (AP-S/URSI 2018), Boston, USA, IEEE 2018: 2357-2358.
- SEWRAJ K, BOTHA MM. Efficiency of various macro basis function schemes for antenna array analysis. Proceedings of the 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), Cartagena de Indias, Colombia, IEEE 2018: 254-257.
2017 and earlier
See the links at the top, to my author profile pages on various online databases.
- Contact
-
Mailing address
Department of Electrical and Electronic Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, Stellenbosch, South Africa
Physical address
Room E407, Department of Electrical and Electronic Engineering, Stellenbosch University, Cnr Banghoek Road & Joubert Street, Stellenbosch, 7600, South Africa. See /contact/ for a map.
