Academic position:
Assistant Professor
Joining date:
01-03-1995
Role in IT: Researcher Scientific Area: Wireless Communications
Degrees
- PhD, Instituto Superior Técnico, 27-03-1998 - MSc, Instituto Superior Técnico, 18-12-1989 - Licenciatura, Instituto Superior Técnico, 31-07-1985
Affiliations
- Ordem dos Engenheiros, Membro, 01-07-1989
- IEEE, Member, 01-05-1989
- Instituto Superior Técnico, Assistant Professor, 04-12-1984
Academic Activities
Supervision of theses
MSc
- From Electronic Cristals to Photonic Crystals, MSc, Sérgio Alexandre Santos Rodrigues , 7-2009, Instituto Superior Técnico
- From Electronic Crystals to Photonic Crystals, MSc, Duarte Rodrigues Pires , 7-2009, Instituto Superior Técnico
- Metamaterial H-guides and NRD Guides, MSc, Artur Manuel Nobre de Sousa Coelho , 7-2009, Instituto Superior Técnico
- Metamaterial Waveguides for Microwaves and Millimeter Waves, MSc, Filipa Isabel Rodrigues Prudêncio , 7-2009, Instituto Superior Técnico
- Moving Media in Minkowski Space Time Algebra, MSc, Romeu Correia Amado , 7-2009, Instituto Superior Técnico
- Optical Beam Propagation in Metamaterials, MSc, Eddy Freitas André , 7-2009, Instituto Superior Técnico
- Relativistic Electrodynamics with Minkowski spacetime algebra, MSc, Walid Karam Azzubaidi , 7-2009, Instituto Superior Técnico
- Dispersion Management in Optical Fibers , MSc, David Manuel Teixeira Fernandes , 6-2008, Instituto Superior Técnico
- Periodic Structures with Metamaterials , MSc, Filipe Miguel Coelho Entradas Pereira da Silva , 6-2008, Instituto Superior Técnico
- Quantum Well Lasers , MSc, Duarte Manuel Esteves Estrada , 6-2008, Instituto Superior Técnico
- Álgebra Geométrica do Espaço Euclidiano: Aplicação a Meios Anisotrópicos , MSc, Rita Filipa Cabeças Lapa , 11-2007
- Álgebra Geométrica do Espaço Euclidiano: Aplicação a Meios Quirais e Omega , MSc, Marisa Nunes Gomes , 11-2007
- Introdução Geométrica à Mecânica Quântica: Átomo de Hidrogénio e Oscilador Harmónico, MSc, Sérgio Manuel Simões Elias, 11-2007, Instituto Superior Técnico
- Introdução Geométrica à Mecânica Quântica: Poços Unidimensionais, MSc, Cátia Ducéria Oliveira Marques , 11-2007, Instituto Superior Técnico
- Propagação Guiada em Meios Metamateriais, MSc, Nuno Parente Coutinho Martins , 11-2007, Instituto Superior Técnico
- Dispositivos Fotónicos Passivos para Óptica Integrada, MSc, Kátia Cesaltina Macedo Sousa Brito , 7-2007, Instituto Superior Técnico
Licenciatura
- Amplificação e Oscilação Laser, Licenciatura, Ana Aguiar e Pedro Duarte, 9-2006
- Análise Modal de Guias de Onda com Meios Complexos para Microondas e Fotónica, Licenciatura, Sandra Leite e Mohamed Neto, 9-2006
- Dispositivos Fotónicos Activos e Passivos: Método da Constante Dieléctrica Efectiva, Licenciatura, José Leal, 9-2006
- Bandas de Energia em Lasers Semicondutores, Licenciatura, Nuno Rodrigues , 7-2005
- Componentes Fotónicos Passivos para Óptica Integrada, Licenciatura, José Trindade e Ricardo Figueira , 7-2005
- Dispersão em meios quirais com aplicação aos guias quirais usados em Microondas, Licenciatura, Pedro Geada , 7-2005
- Comutação Fotónica da Informação em Sistemas de Comunicação Óptica com Solitões, Licenciatura, Daniel das Neves Vieira Lima , 7-2003
Co - Supervision of Theses
PhD
-
Chirality and Nonlinearity in Optical Fibers, PhD, Fernando Janeiro , 1-2004
Publications
Book Chapters
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Dispersion and losses in metamaterial DNG H-guides" - Chapter in Metamaterials and Plasmonics: Fundamentals, Modelling and Applications, S. Zouhdi, A. Sihvola, and A. Vinogradov, Springer, ,
2009.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation in Omega Waveguides:Discrete Complex Modes and Application to a Ridge Waveguide" - Chapter in Progress in Electromagnetic Research, J. A. Kong, EMW Publishing, Cambridge, Massachussets,
2004.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Surface and Leaky Modes of Multilayered Omega Structures" - Chapter in Advances in Electromagnetics of Complex Media and Metamaterials, Saïd Zouhdi, Ari Sihvola, and Mohamed Arsalane , Kluwer Academic, Dordrecht, Netherlands,
2002.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complete Spectral Representation for the Electromagnetic Field of Planar Multilayered Waveguides Containing Pseudochiral Omega Media" - Chapter in Progress In Electromagnetic Research, J. A. Kong, EMW Publishing, Cambridge, Massachussets,
1998.
Papers in Journals
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation in Chiral H-Guides", Progress In Electromagnetics Research - PIER , Vol. PIER 103, No. 103, pp. 285 - 303, April, 2010.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Guidance and Leakage Behavior of Uniaxial Ridge Waveguides", Journal of Electromagnetic Waves and Applications, Vol. 23, No. 13, pp. 1675 - 1684, September, 2009.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Novel propagation features of double negative H-guides and H-guide couplers", Microwave and Optical Tech. Letters, Vol. 47, No. 2, pp. 185 - 190, October, 2005.
- Janeiro, F. M.; Paiva, C. R.; Topa, A.; "Guidance and leakage properties of chiral optical fibers", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , Vol. 19, No. 11, pp. 2558 - 2566, November, 2002.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complex Eigenmodes in Planar Waveguides with Pseudochiral Omega Media", Izvestiya Gomel'skogo Gosundarstvennogo Universitet, Vol. 9, No. 6, pp. 84 - 88, November, 2001.
- W. Weiglhofer; Barbosa, A.; Topa, A.; "Guest Editorial", AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS , Vol. 55, No. 4, pp. 209 - 210, July, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Least Squares Boundary Residual Method for the Analysis of Step Discontinuities in Open Chiral Waveguides", AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS , Vol. 55, No. 4, pp. 281 - 291, July, 2001.
- Paiva, C. R.; Topa, A.; Barbosa, A.; "Influence of intermodal dispersion on the switching of solitons at different wavelengths in twin-core fiber couplers", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , Vol. 16, No. 10, pp. 1636 - 1641, October, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Propagation Characteristics of the Rectangular Waveguide Inhomogeneously Filled with Uniaxial Omega Media", IEICE Trans. on Electronics, Vol. E82-C, No. 7, pp. 1166 - 1171, July, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Full-Wave Analysis of a Nonradiative Dielectric Waveguide with a Pseudochiral Omega Slab", IEEE Trans. on Microwave Theory and Tech., Vol. 46, No. 9, pp. 1263 - 1269, September, 1998. Abstract | Full text (PDF 246KB)
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complete Spectral Representation for the Electromagnetic Field of Planar Multilayered Waveguides Containing Pseudochiral Omega Media - Abstract", Journal of Electromagnetic Waves and Applications, Vol. 12, No. 3, pp. 349 - 350, March, 1998.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "New Biorthogonality Relations for Inhomogeneous Biisotropic Planar Waveguides", IEEE Trans. on Microwave Theory and Tech., Vol. 42, No. 5, pp. 629 - 634, April, 1994.
- Paiva, C. R.; Topa, A.; Barbosa, A.; "Novel propagation features of dielectric planar chirowaveguides due to nonreciprocity", Microwave and Optical Tech. Letters, Vol. 6, No. 3, pp. 182 - 185, March, 1993.
- Paiva, C. R.; Topa, A.; Barbosa, A.; "Semileaky waves in dielectric chirowaveguides", Optics Letters, Vol. 17, No. 23, pp. 1670 - 1672, December, 1992.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Rigorous Analysis of a Step Discontinuity in a Dielectric Planar Anisotropic Waveguide", Microwave and Optical Tech. Letters, Vol. 5, No. 11, pp. 602 - 606, October, 1992.
Papers in Conference Proceedings
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation in Waveguides with Indefinite Media", Proc IEEE AP-S/URSI International Symp., Toronto, Canada, Vol. 1, pp. 1 - 1, July, 2010.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Variable Omega Directional Couplers", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Cáceres, Spain, Vol. 1, pp. 1 - 1, May, 2010.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "NRD Directional Couplers using Omega Media", Proc NATO Advanced Research Workshop: Metamaterials for Secure Information and Communication Technologies - ARW, Cairo, Egypt, Vol. 1, pp. 1 - 1, February, 2010.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "New NRD-waveguide Devices Using Metamaterials", Proc Progress in Electromagnetics Research Symp. - PIERS, Moscow, Russia, Vol. 1, pp. 1 - 1, August, 2009.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leakage, Dispersion and Losses in Omega H-Guides", Proc IEEE AP-S/URSI International Symp., Charleston, United States, Vol. 1, pp. 1 - 1, June, 2009.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leaky Mode Dispersion in Omega NRD Waveguides", Proc Conf. on Telecommunications - ConfTele, Vila da Feira, Portugal, Vol. 1, pp. 1 - 1, May, 2009.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Metamaterial Dispersion and Loss in a Double Negative Nonradiative Dielectric Waveguide", Proc IEEE CONVENTION OF ELECTRICAL AND ELECTRONICS ENGINEERS IN ISRAEL - IEEE-I, Eilat, Israel, Vol. , pp. - - -, December, 2008.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Guided Waves in Metamaterials", Proc URSI Seminar of the Portuguese Committee, Lisboa, Portugal, Vol. , pp. - - -, November, 2008.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Guided Waves in Metamaterial Three-dimensional Waveguides", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Cádiz, Spain, Vol. , pp. 1 - 1, October, 2008.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "The effect of material dispersion in omega nonradiative dielectric waveguides", Proc URSI General Assembly, Chicago, United States, Vol. 1, pp. 1 - 1, August, 2008.
Abstract
- Topa, A.; Paiva, C. R.; Barbosa, A.; "The effect of metamaterial losses in DNG H-guide performance", Proc NATO Advanced Research Workshop: Metamaterials for Secure Information and Communication Technologies - ARW, Marrakesh, Morocco, Vol. 1, pp. 569 - 569, May, 2008.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Proper Leaky Modes in DNG Ridge Waveguides", Proc Progress in Electromagnetics Research Symp. - PIERS, Prague, Czech Republic, Vol. 1, pp. 1 - 4, August, 2007.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Dispersive Leaky-Mode Propagation in Metamaterial Nonradiative Dielectric Waveguides", Proc IEEE AP-S/URSI International Symp., Honolulu, United States, Vol. 1, pp. 1 - 4, June, 2007.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Propagation Analysis of Chiral H-Guides", Proc Conf. on Telecommunications - ConfTele, Peniche, Portugal, Vol. 1, pp. 5 - 8, May, 2007.
- R. Rosa; P. Oliveira; Topa, A.; Fernandes, C. A.; "Visualization Tool for the Propagation of Electromagnetic Waves", Proc Conf. on Telecommunications - ConfTele, Peniche, Portugal, Vol. 1, pp. 93 - 96, May, 2007.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Assessment of the Effective Index Method in the Analysis of DNG Metamaterial Waveguides", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Barcelona, Spain, Vol. 1, pp. 1 - 4, April, 2007.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic-Wave Propagation in Chiral H-Guides", Proc USNC/URSI National Radio Science Meeting, Albuquerque, United States, Vol. 1, pp. 1 - 1, July, 2006.
- Canto, João R.; Matos, S.A.; Topa, A.; Paiva, C. R.; "Comportamento Dispersivo de Modos Leaky em Guias Metamateriais DNG", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Seia, Portugal, Vol. 1, pp. 29 - 32, September, 2005.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "DNG-NRD Directional Couplers", Proc Progress in Electromagnetics Research Symp. - PIERS, Hangzhou, China, Vol. 1, pp. 115 - 115, August, 2005.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Mode Coupling in Parallel DNG/DPS H-Guides: A Full-wave Analysis", Proc USNC/URSI National Radio Science Meeting, Washington, United States, Vol. 1, pp. 1 - 1, July, 2005.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Surface and Leaky Modes in a Symmetric DPS-DNG Slab", Proc IEEE AP-S/URSI International Symp., Washington, United States, Vol. -, pp. - - -, July, 2005.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation in Waveguiding Structures Containing DNG Metamaterials", Proc Conf. on Telecommunications - ConfTele, Tomar, Portugal, Vol. 1, pp. 1 - 1, April, 2005.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Reflection and Transmission at a Chiral Planar Interface", Proc Conf. on Telecommunications - ConfTele, Tomar, Portugal, Vol. 1, pp. - - -, April, 2005.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Guided Wave Propagation in H-guides using Double Negative Materials", Proc USNC/URSI National Radio Science Meeting, Monterey, United States, Vol. 1, pp. 156 - 156, June, 2004.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation in 3D Planar Waveguides Using Unconventional Media", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Burgos, Spain, Vol. 1, pp. 1 - 4, December, 2003.
- Topa, A.; "Leaky modes in planar waveguides containing DNG metamaterials", Proc International Conf. on Electromagnetics in Advanced Applications - ICEAA, Torino, Italy, Vol. 1, pp. 447 - 450, September, 2003.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Discrete Complex Spectrum of 3D Omega Waveguides", Proc USNC/URSI National Radio Science Meeting, Columbus, United States, Vol. 1, pp. 221 - 221, June, 2003.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Recent Results on the Electromagnetic Characterization of Chiral Planar Waveguides", Proc Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. 1, pp. 115 - 118, June, 2003.
- Topa, A.; "Contra-Directional Coupling in NRD Directional Coupler with a Metamaterial Slab", Proc URSI General Assembly, Maastricht, Netherlands, Vol. 1, pp. 1878 - 1878, August, 2002.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complex Spectrum of 3D Open Chiral Waveguides", Proc USNC/URSI National Radio Science Meeting, San Antonio, United States, Vol. 1, pp. 111 - 111, June, 2002.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Leakage characteristics of open chirowaveguides – Dielectric slabs and optical fibers", Proc International Conf. on Electromagnetics of Complex Media - BIANISOTROPICS , Marrakech, Morocco, Vol. 1, pp. 69 - 69, May, 2002.
- H. M. Ramos; Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Material and waveguide dispersion in a symmetric planar chirowaveguide", Proc International Conf. on Electromagnetics of Complex Media - BIANISOTROPICS , Marrakech, Morocco, Vol. 1, pp. 75 - 75, May, 2002.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Surface and Leaky Modes of Multilayered Omega Structures", Proc International Conf. on Electromagnetics of Complex Media - BIANISOTROPICS , Marrakech, Morocco, Vol. 1, pp. 46 - 46, May, 2002.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Characterization of Abrupt Discontinuities in Chiral Waveguides", Proc Encuentro Ibérico de Electromagnetismo Computacional - EIEC , Aracena, Spain, Vol. 1, pp. 12 - 12, December, 2001.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Semi-Leaky Modes in Chiral Optical Fibers", Proc IEEE Lasers and Electro Optics Society Annual Meeting - LEOS, San Diego, United States, Vol. 1, pp. 897 - 898, November, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complex Eigenmodes in Planar Waveguides with Pseudochiral Omega Media", Proc Problems of Interaction of Radiation with Matter, Gomel, Belarus, Vol. 1, pp. 69 - 69, October, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Complex Spectrum of Planar Omega Structures", Proc International Conf. on Electromagnetics in Advanced Applications - ICEAA, Torino, Italy, Vol. 1, pp. 719 - 722, September, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Semileaky Modes in Dielectric Pseudochiral Slabs", Proc USNC/URSI National Radio Science Meeting, Boston, United States, Vol. 1, pp. 388 - 388, July, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Theory of Inhomogeneous Planar Layered Waveguides with Transverse Anisotropy", Proc URSI International Symp. in Electromagnetic Theory, Victoria, Canada, Vol. 1, pp. 98 - 100, May, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Continuous and Discrete Spectrum of 3D Waveguides with Complex Media – Radiative and Leakage Behavior", Proc Conf. on Telecommunications - ConfTele, Figueira da Foz, Portugal, Vol. 1, pp. 42 - 46, April, 2001.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Optimal Dispersion Maps in Filtered WDM Soliton Systems", Proc Conf. on Telecommunications - ConfTele, Figueira da Foz, Portugal, Vol. 1, pp. 493 - 496, April, 2001.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Design of Pseudochiral Omega-NRD Directional Couplers", Proc Asia Pacific Microwave Conf. - APMC, Sidney, Australia, Vol. 1, pp. 1238 - 1241, December, 2000.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Radiation Control on a Step Discontinuity of a Grounded Chiral Slab", Proc International Conf. on Electromagnetics of Complex Media - BIANISOTROPICS , Lisbon, Portugal, Vol. 1, pp. 325 - 328, September, 2000.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Dispersion-Managed Wavelength Division Multiplexed Soliton Systems with Filtering", Proc Progress in Electromagnetics Research Symp. - PIERS, Boston, United States, Vol. 1, pp. 45 - 45, July, 2000.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leakage Effects in Pseudochiral Waveguides", Proc Progress in Electromagnetics Research Symp. - PIERS, Cambridge, United States, Vol. 1, pp. 95 - 95, July, 2000.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Mode Orthogonality in Pseudochiral Planar Waveguides", Proc USNC/URSI National Radio Science Meeting, Salt Lake City, United States, Vol. 1, pp. 65 - 65, July, 2000.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Electromagnetic Wave Propagation Characteristics of Chiral and Pseudochiral Waveguides", Proc URSI General Assembly, Toronto, Canada, Vol. 1, pp. 200 - 200, August, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leakage Properties of Open 3D Anisotropic Waveguides", Proc USNC/URSI National Radio Science Meeting, Orlando, United States, Vol. 1, pp. 32 - 32, July, 1999.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "Gestão da Dispersão em Sistemas de Comunicação Óptica WDM com Solitões", Proc Encontro do Colégio de Electrotecnia da Ordem dos Engenheiros, Lisboa, Portugal, Vol. 1, pp. 127 - 132, May, 1999.
- Janeiro, F. M.; Topa, A.; Paiva, C. R.; "A New Design Procedure to Select Optimal Dispersion Maps for WDM Soliton Communication Systems", Proc Conf. on Telecommunications - ConfTele, Sesimbra, Portugal, Vol. 1, pp. 167 - 171, April, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leaky Modes in Anisotropic Planar Structures with Application to LiNb03 Waveguides", Proc Conf. on Telecommunications - ConfTele, Sesimbra, Portugal, Vol. 1, pp. 476 - 480, April, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leaky Modes in Open Uniaxial Waveguides", Proc Progress in Electromagnetics Research Symp. - PIERS, Taipei, Taiwan, Vol. 1, pp. 940 - 940, March, 1999.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Rigorous Analysis of the Rectangular Waveguide Loaded with a Pseudochiral Omega Slab", Proc Asia Pacific Microwave Conf. - APMC, Yokohama, Japan, Vol. 1, pp. 277 - 280, December, 1998.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Aplicação do Método dos Mínimos Quadrados ao Estudo de Descontinuidades em Degrau em Guias Dieléctricos Planares", Proc Matemática em Telecomunicações - Que Problemas? - MTQP, Coimbra, Portugal, Vol. 1, pp. 37 - 45, September, 1998.
- L. N. Vicente; Topa, A.; Paiva, C. R.; Barbosa, A.; "Application of The Least Squares Boundary Residual Method to the Study of Step Discontinuities in Dielectric Planar Waveguides", Proc Matemática em Telecomunicações - Que Problemas? - MTQP, Coimbra, Portugal, Vol. 1, pp. 99 - 108, July, 1998.
- Topa, A.; L. N. Vicente; Paiva, C. R.; Barbosa, A.; "Application of the Least Squares Method to the Analysis of Planar Waveguides for Integrated Optics", Proc Optimization, Coimbra, Portugal, Vol. 1, pp. 63 - 63, July, 1998.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Leaky Modes in Chiral Rib Waveguides", Proc Progress in Electromagnetics Research Symp. - PIERS, Nantes, France, Vol. 2, pp. 517 - 517, July, 1998.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Hybrid Mode Propagation in Pseudochiral Uniaxial Waveguides with Rectangular Cross-Section", Proc International Conf. on Electromagnetics of Complex Media - BIANISOTROPICS , Braunschweig, Germany, Vol. 1, pp. 151 - 154, June, 1998.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Omega NRD – Pseudochiral Nonradiative Dielectric Waveguide", Proc Asia Pacific Microwave Conf. - APMC, Hong Kong (SAR), China, Vol. 2, pp. 597 - 600, December, 1997.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "A Linear-Operator Formalism for the Analysis of Inhomogeneous Pseudochiral Planar Waveguides", Proc USNC/URSI National Radio Science Meeting, Montreal, Canada, Vol. 1, pp. 81 - 81, July, 1997.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "A Linear-Operator Formalism for the Analysis of Planar Layered Waveguides Containing Omega Media: Application to Microwave Devices", Proc Conf. on Telecommunications - ConfTele, Aveiro, Portugal, Vol. 1, pp. 111 - 114, April, 1997.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Radiation Modes of an Asymmetric Chiral Slab Waveguide - A General Approach to a New Canonical Problem", Proc Progress in Electromagnetics Research Symp. - PIERS, Hong Kong, Hong Kong, Vol. 2, pp. 684 - 684, January, 1997.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Step Discontinuity in a Planar Dielectric Chiral Slab: An Improved Analysis", Proc Progress in Electromagnetics Research Symp. - PIERS, Innsbruck, Austria, Vol. 1, pp. 495 - 495, July, 1996.
- Topa, A.; Paiva, C. R.; Barbosa, A.; "Rigorous Analysis of a Step Discontinuity in a Planar Dielectric Chiral Slab", Proc International Conf. on Chiral, Bi-isotropic and Bi-anisotropic - CHIRAL, State College, PA, United States, Vol. 1, pp. 131 - 134, October, 1995.
- Paiva, C. R.; Barbosa, A.; Topa, A.; "A new analytical method for the study of layered anisotropic waveguides", Proc IEEE Mediterranean Electr. Conf. - MELECON , Lisboa, Portugal, Vol. 89, pp. 691 - 694, April, 1989.
- Paiva, C. R.; Barbosa, A.; Topa, A.; "Analysis of the conductor-backed uniaxial slab with upper-shielding in the polar configuration", Proc Simpósio de Electrónica das Telecomunicações, Porto, Portugal, Vol. 3, pp. xx - xx, May, 1988.
Other Scientific Achievements
Miscellaneous
- Barbosa, A.; Topa, A.; "Editor of Conference Proceedings", 8th International Conference on Electromagnetics of Complex Media-BIANISOTROPICS 2000", ISBN 972-98115-1-2, 01-09-2000.
