References of "Obelleiro, Fernando"
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See detailLocalized iterative generalized multipole technique for large two-dimensional scattering problems
Obelleiro, Fernando; Landesa, Luis; Rodriguez, Jose Luis et al

in Ieee Transactions On Antennas And Propagation (2001), 49(6), 961-970

In this work, we propose a novel and efficient solution for the generalized multipole technique (GMT): the localized iterative generalized multipole technique (LIGMT). In LIGMT, an analytic constraint is ... [more ▼]

In this work, we propose a novel and efficient solution for the generalized multipole technique (GMT): the localized iterative generalized multipole technique (LIGMT). In LIGMT, an analytic constraint is imposed on the power radiated by the set of multipole sources sharing the same origin, rendering it minimum over a given angular sector. In this way, the power radiated by each set of multipoles is confined to a different section of the scatterer surface. It follows that each set of multipole coefficients can be solved step by step via an iterative process, which circumvents the need to solve the large and full matrix equation. This implies a significant reduction of the computational and storage cost, enhancing the scope of application of the GMT method to larger problems. [less ▲]

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See detailSynthesis of an array antenna for hyperthermia applications
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

in IEEE Transactions on Magnetics (2000), 36(4), 1696-1699

In the present work the synthesis of an array antenna for hyperthermia treatment is developed. The selected antenna is an array antenna surrounded by a semicircular reflector which has shown to ease the ... [more ▼]

In the present work the synthesis of an array antenna for hyperthermia treatment is developed. The selected antenna is an array antenna surrounded by a semicircular reflector which has shown to ease the penetration and focalization in malignant biological tissues. A bolus is introduced as a protection in order to avoid an increasing heat hazard of superficial healthy tissues. The electric field within the biological medium will be modeled by means of the well known method of moments. The electromagnetic coupling problem is expressed in a closed form, enabling both a synthesis and an optimization procedure to be performed. Numerical results are included, illustrating the capabilities of the array antenna. [less ▲]

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See detailAceleración del método Generalized Multipole Technique para el estudio de la dispersión electromagnética de objetos de grandes dimensiones
Obelleiro, Fernando; Landesa, Luis; Pino, Marcos R et al

(1999, September)

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See detailSíntesis de agrupaciones de antenas para el calentamiento selectivo de tejidos humanos
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

(1999, September)

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See detailAceleración de soluciones iterativas de problemas electromagnéticos mediante FMM (Fast Multipole Method)
Landesa, Luis; V Sabariego, Ruth ULg; Obelleiro, Fernando

(1999, September)

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See detailFar-field decoupled basis for the method of moments-2D case - Abstract
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando et al

in Journal of Electromagnetic Waves & Applications (1999), 13(11), 1529-1530

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost ... [more ▼]

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost. Continuous efforts have been developed to overcome this drawback. In this paper, the goal is to generate a set of basis functions defined over the entire domain and characterized by a null radiated power coupling in the far-field region. This behavior permits to diminish the density of unknowns per wavelength, considering only a reduced set of the new basis. Furthermore, the resulting matrix has a sparse structure. All these factors amounts to considerable savings in terms of computer storage and CPU requirements. [less ▲]

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See detailFar-field decoupled basis for the method of moments-2D case
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

in Progress in Electromagnetics Research [=PIER] (1999), 24

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost ... [more ▼]

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost. Continuous efforts have been developed to overcome this drawback. In this paper, the goal is to generate a set of basis functions defined over the entire domain and characterized by a null radiated power coupling in the far-field region. This behavior permits to diminish the density of unknowns per wavelength, considering only a reduced set of the new basis. Furthermore, the resulting matrix has a sparse structure. All these factors amounts to considerable savings in terms of computer storage and CPU requirements. [less ▲]

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See detailDesign of a microwave array hyperthermia applicator with a semicircular reflector
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

in Medical & Biological Engineering & Computing (1999), 37(5), 612-617

The design of a hyperthermia applicator for heating biological tissues is presented in which the applicator consists of an array antenna surrounded by a perfect electrically conducting reflector. The heat ... [more ▼]

The design of a hyperthermia applicator for heating biological tissues is presented in which the applicator consists of an array antenna surrounded by a perfect electrically conducting reflector. The heat hazard to superficial tissues is reduced by the introduction of a dielectric protecting layer over them. A method of moments formulation is applied to approximate the electric field within the biological medium and a closed form expression is presented for the electromagnetic coupling problem, which enables an optimisation procedure to be performed. The applicator enhances both penetration and focusing: deep tumours, close to the bone region, are heated and the percentage of biologically healthy tissue exposed to a specific absorption rate (SAR) hazard level diminishes by 53.8%. [less ▲]

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See detailDirective beam expansions for the generalized multipole technique
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

in Microwave & Optical Technology Letters (1999), 22(6), 382-387

In recent years, the generalized multipole technique (GMT) and other fictitious source methods have been widely used to solve electromagnetic scattering problems. Nevertheless, these methods have been ... [more ▼]

In recent years, the generalized multipole technique (GMT) and other fictitious source methods have been widely used to solve electromagnetic scattering problems. Nevertheless, these methods have been shown to be very sensitive to the source locations, and often produce ill-conditioned matrix systems. The current approach suggests a kind of synthesized directive expansion to reduce the dependence on the source locations, the condition number of the impedance matrix, and the number of unknowns. [less ▲]

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