José Maria Tamayo

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The Multilevel Adaptive Cross Approximation (MLACA), an algorithm to solve MoM electromagnetic problems with computational cost O(N<sup>2</sup>) and a storage scaling with O(NlogN), is presented here and for the first time applied to a whole electromagnetic problem and not only to the interaction between blocks whose containing spheres do not intersect each(More)
A novel algorithm, the compressed block decomposition, is presented for highly accelerated direct (noniterative) method-of-moment capacitance extraction. The algorithm is based on a blockwise subdivision of the method-of-moment potential coefficient matrix. Matrix subblocks corresponding to distant subregions of the problem geometry are not calculated(More)
The Method of Moments for electromagnetic scattering and radiation problems is often used in conjunction with the EFIE because the EFIE allows the analysis of open surfaces. For electrically large closed surfaces, the CFIE is often much more efficient because it yields a well conditioned impedance matrix. This is particularly important when an iterative(More)
Hypersingular 4-D integrals, arising in the Galerkin discretization of surface integral equation formulations, are computed by means of the direct evaluation method. The proposed scheme extends the basic idea of the singularity cancellation methods, usually employed for the regularization of the singular integral kernel, by utilizing a series of coordinate(More)
This paper compares several synthesis alternatives for a 4GHz filter with 36 MHz bandwidth. The alternatives considered are: classical synthesis, various forms of pre­ distortion and lossy filter synthesis. Electrical performance of the various alternatives is discussed in detail and a brief description of the topologies is also given. The synthesis of the(More)
Vie present new implementations in the method of moments of two types of second-kind integral equations: (i) the recently proposed electric-magnetic field integral equation (EMFIE) for perfectly conducting objects, and (ii) the M&#x00FC;ller formulation for homogeneous or piecewise homogeneous dielectric objects. We adopt the Taylor-orthogonal basis(More)
The direct evaluation program tailored to the singular integrals arising in the first-kind and second-kind Fredholm surface integral equation formulations is presented. The exponential convergence of the proposed technique can safely guarantee the inherited asymptotic accuracy of Galerkin discretization schemes. In this contribution, we highlight the(More)
Numerical simulation of shipborne HF antennas involves some difficulties due to: 1. The ill-conditioned nature of the Electric Field Integral Equation (EFIE) discretized by the Method of Moments (MoM) [1] at low frequencies(&#x201C;low-frequency breakdown&#x201D;). 2. The different scaling between the antenna fine mesh and the ship surface coarse mesh(More)
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