Publications by Ioannis Koufogiannis

On the Development and Evaluation of Spatial-Domain Green's Functions for Multilayered Structures With Conductive Sheets

Juan Ramon Mosig, Michael Mattes, Ioannis Koufogiannis

This work focuses on Green's functions (GFs) of planar multilayered structures that may include an arbitrary number of conductive sheets. The spectral-domain GFs are derived through an automatized strategy based on the propagator matrix technique, while th ...

Institute of Electrical and Electronics Engineers2015

Volume Integral Equation Formulation for Medical Applications

Juan Ramon Mosig, Michael Mattes, Mina Bjelogrlic, Ioannis Koufogiannis, Santiago Capdevila Cascante

In recent years, there is a considerable and growing interest in developing fast integral equation methods for solving Maxwell’s equations. Volume integral equations are a versatile technique to model inhomogeneous scattering objects. Numerical tests show ...

2015

On the development and evaluation of spatial domain Green Functions for multilayered structures with conductive sheets

Juan Ramon Mosig, Michael Mattes, Ioannis Koufogiannis

This work focuses on Green Functions (GFs) of planar multilayered structures that may include arbitrary number of conductive sheets. The spectral domain GFs are derived through an automatized strategy based on the propagator matrix technique, while the spa ...

2014

The Mixed Potential Integral Equation for New Multilayered Structures Including Conductive Shee : Analytical and Numerical Techniques

Ioannis Koufogiannis

EPFL2014

Extremely phase stable RF-cable for space applications

Michael Mattes, Francisco Edén Sorolla Rosario, Ioannis Koufogiannis

2014

Analysis of Corona Breakdown in Elliptical Waveguides

Michael Mattes, Francisco Edén Sorolla Rosario, Ioannis Koufogiannis

2014

Microwave gas breakdown in elliptical waveguides

Michael Mattes, Francisco Edén Sorolla Rosario, Ioannis Koufogiannis

This paper analyzes the microwave gas discharge within elliptical waveguides excited by the fundamental mode. The Rayleigh-Ritz method has been applied to solve the continuity equation. The eigenvalue problem defined by the breakdown condition has been sol ...

American Institute of Physics (AIP)2014

Mixed Potentials for Planar Multilayered Structures Including Conductive Interfaces

Juan Ramon Mosig, Michael Mattes, Ioannis Koufogiannis

A complete and automatized strategy has been developed to derive the Vector and Scalar Potential Green’s Functions (GFs) of planar multilayered structures that include conductive sheets. The propagator matrix technique is enhanced to include conductive she ...

2014

Analyzing Corona breakdown with a finite element-based electromagnetic solver

Juan Ramon Mosig, Michael Mattes, Francisco Edén Sorolla Rosario, Ioannis Koufogiannis

This paper demonstrates how an already developed finite element code for solving electromagnetic problems can be manipulated and simply extended so as to investigate complicated corona breakdowns. A safe criterion based on the eigenvalue analysis is used i ...

2013

Dyadic Green's functions of a graphene layer and their efficient calculation

Juan Ramon Mosig, Michael Mattes, Ioannis Koufogiannis, Juan Sebastian Gomez Diaz

2013

On the numerical evaluation of Green functions for structures with graphene layers

Juan Ramon Mosig, Michael Mattes, Athanasios Polymeridis, Ioannis Koufogiannis

2013

Real axis integration of Sommerfeld integrals with error estimation

Juan Ramon Mosig, Michael Mattes, Athanasios Polymeridis, Ioannis Koufogiannis

2012

Considerations on double exponential-based cubatures for the computation of weakly singular Galerkin inner products

Juan Ramon Mosig, Michael Mattes, Athanasios Polymeridis, Ioannis Koufogiannis

Highly accurate and efficient cubatures based on the double exponential quadrature rules are presented for the computation of weakly singular integrals arising in Galerkin mixed potential integral equation formulations. Due to their unique ability to handl ...

Institute of Electrical and Electronics Engineers2012

Ionization Rates: a Comparative Study to Predict Corona Breakdown

Michael Mattes, Francisco Edén Sorolla Rosario, Ioannis Koufogiannis

2011

Optimized machine precision double exponential quadratures applicable in weakly singular integrals

Juan Ramon Mosig, Michael Mattes, Ioannis Koufogiannis

2011