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- Francesco Ferranti, Luc Knockaert, Tom Dhaene
- IEEE Transactions on Advanced Packaging
- 2010

We propose a novel parametric macromodeling technique for admittance and impedance input-output representations parameterized by design variables such as geometrical layout or substrate features. It is able to build accurate multivariate macromodels that are stable and passive in the entire design space. An efficient combination of rational identification… (More)

- Francesco Ferranti, Luc Knockaert, Tom Dhaene
- IEEE Microwave and Wireless Components Letters
- 2009

This letter presents a novel parametric macromodeling technique for scattering input-output representations parameterized by design variables such as geometrical layout or substrate features. It provides accurate multivariate macromodels that are stable and passive by construction over the entire design space. Overall stability and passivity of the… (More)

- Dirk Deschrijver, M. Mrozowski, Tom Dhaene, Daniël De Zutter
- IEEE Microwave and Wireless Components Letters
- 2008

Broadband macromodeling of large multiport systems by vector fitting can be time consuming and resource demanding when all elements of the system matrix share a common set of poles. This letter presents a robust approach which removes the sparsity of the block-structured least-squares equations by a direct application of the QR decomposition. A 60-port… (More)

- Dirk Gorissen, Ivo Couckuyt, Piet Demeester, Tom Dhaene, Karel Crombecq
- Journal of Machine Learning Research
- 2010

An exceedingly large number of scientific and engineering fields are confronted with the need for computer simulations to study complex, real world phenomena or solve challenging design problems. However, due to the computational cost of these high fidelity simulations, the use of neural networks, kernel methods, and other surrogate modeling techniques have… (More)

- Ivo Couckuyt, Dirk Deschrijver, Tom Dhaene
- J. Global Optimization
- 2014

The use of Surrogate Based Optimization (SBO) is widely spread in engineering design to reduce the number of computational expensive simulations. However, “real-world” problems often consist of multiple, conflicting objectives leading to a set of competitive solutions (the Pareto front). The objectives are often aggregated into a single cost function to… (More)

The increasing use of expensive computer simulations in engineering places a serious computational burden on associated optimization problems. Surrogate-based optimization becomes standard practice in analyzing such expensive black-box problems. This article discusses several approaches that use surrogate models for optimization and highlights one… (More)

- Karel Crombecq, Dirk Gorissen, Dirk Deschrijver, Tom Dhaene
- SIAM J. Scientific Computing
- 2011

Many complex real-world systems can be accurately modeled by simulations. However, high-fidelity simulations may take hours or even days to compute. Because this can be impractical, a surrogate model is often used to approximate the dynamic behavior of the original simulator. This model can then be used as a cheap, drop-in replacement for the simulator.… (More)

- Dirk Deschrijver, Bart Haegeman, Tom Dhaene
- IEEE Transactions on Advanced Packaging
- 2007

Vector Fitting is widely accepted as a robust macromodeling tool for approximating frequency domain responses of complex physical structures. In this paper, the Orthonormal Vector Fitting technique is presented, which uses orthonormal rational functions to improve the numerical stability of the method. This reduces the numerical sensitivity of the system… (More)

- Karel Crombecq, Eric Laermans, Tom Dhaene
- European Journal of Operational Research
- 2011

Simulated computer experiments have become a viable cost-effective alternative for controlled real-life experiments. However, the simulation of complex systems with multiple input and output parameters can be a very timeconsuming process. Many of these high-fidelity simulators need minutes, hours or even days to perform one simulation. The goal of global… (More)

A new adaptive technique is presented for building multidimensional parameterized analytical models for general planar microwave structures with a predefined accuracy and based on full-wave electromagnetic (EM) simulations. The models can be incorporated in a circuit simulator and the time required to calculate the circuit representation of a practical… (More)