Browsing by Author "Heldring, Alexander"

Simultaneously improving the efficiency and compression of the adaptive cross approximation algorithm
Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Conference lecture
Restricted access  publisher's policyThis paper proposes an adaptation of the conventional ACA algorithm for blockwise impedance matrix compression, yielding a substantial speedup as well as a higher compression rate. The recently published stochastic ... 
Sparsified ACA for accelerated iterative solution of the MoM linear system
Heldring, Alexander; Rius Casals, Juan Manuel; Úbeda Farré, Eduard; Tamayo Palau, José María (2011)
Conference report
Restricted access  publisher's policyA new algorithm, the Sparsified Adaptive Cross Approximation (SPACA) is presented for fast iterative solution of the Method of Moments linear system. Like ordinary ACA, it is a completely kernelindependent method, but ... 
Sparsified adaptive cross approximation algorithm for accelerated method of moments computations
Heldring, Alexander; Tamayo Palau, José María; Simon, C.; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (201208)
Article
Restricted access  publisher's policyThis paper presents a modification of the adaptive cross approximation (ACA) algorithm for accelerated solution of the Method of Moments linear system for electrically large radiation and scattering problems. As with ACA, ... 
Stable discretization of the electricmagnetic field integral equation with the taylororthogonal basis functions
Úbeda Farré, Eduard; Tamayo Palau, José María; Rius Casals, Juan Manuel; Heldring, Alexander (201303)
Article
Restricted access  publisher's policyWe present two new facetoriented discretizations in method of moments (MoM) of the electricmagnetic field integral equation (EMFIE) with the recently proposed Taylororthogonal (TO) and divergenceTaylororthogonal ... 
Stochastic estimation of the Frobenius norm in the ACA convergence criterion
Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (20150301)
Article
Open AccessThe adaptive cross approximation (ACA) algorithm has been used in many fast Integral Equation solvers for electromagnetic Radiation and Scattering problems. It efficiently computes a low rank approximation to the interaction ... 
Tangentialnormal surface testing for the nonconforming discretization of the electricfield integral equation
Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (20160112)
Article
Open AccessNonconforming implementations of the electricfield integral equation (EFIE), based on the facetoriented monopolarRWG set, impose no continuity constraints in the expansion of the current between adjacent facets. These ... 
Testing over the boundary interface for the nonconforming discretization of the ElectricField Integral Equation
Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Conference report
Restricted access  publisher's policyMethodofmoment (MoM) implementations of the Electricfield Integral Equation (EFIE) in the scattering analysis of infinitely long (2D) or arbitrarily shaped (3D) conductors have traditionally required, respectively, ... 
The multiscale compressed block decomposition as a preconditioner for method of moments computations
Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access  publisher's policyA new preconditioner for Method of Moments computations is presented. It is based on a direct solver, the Multiscale Compressed Block Decomposition method, which has been adapted to reduce storage requirements and setup ... 
Versatile facetoriented discretization of the electricfield integral equation
Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Conference report
Restricted access  publisher's policyTraditional methodofmoment implementations of the electricfield integral equation (EFIE) are based on sets of divergenceconforming basis functions, such as the loworder RaoWiltonGlisson (RWG) set, which arise from ... 
Volumetric testing for a nonconforming discretization in method of moments of the electricfield surface integral equation
Úbeda Farré, Eduard; Rius Casals, Juan Manuel; Heldring, Alexander (2013)
Conference report
Restricted access  publisher's policyImplementations in Method of Moments of the ElectricField Integral Equation (EFIE) are traditionally carried out with divergenceconforming sets, with normal continuity of the current across edges. This gives rise to ... 
Volumetric testing for the nonconforming discretization of integral equations in scattering problems
Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Conference report
Restricted access  publisher's policyThe traditional discretizations of the electricfield integral equation (EFIE) impose the continuity of the normal component current across the edges in the meshing. These edgeoriented schemes become awkward in the ... 
Volumetric testing parallel to the boundary surface for a nonconforming discretization of the electricfield integral equation
Úbeda Farré, Eduard; Rius Casals, Juan Manuel; Heldring, Alexander; Sekulic, Ivan (201507)
Article
Open AccessThe volumetric monopolarRWG discretization of the electricfield integral equation (EFIE) imposes no continuity constraint across edges in the surface discretization around a closed conductor. The current is expanded with ... 
Volumetric testing with wedges for a nonconforming discretization of the ElectricField Integral Equation
Úbeda Farré, Eduard; Rius Casals, Juan Manuel; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference report
Restricted access  publisher's policyThe discretization in Method of Moments (MoM) of the ElectricField Integral Equation (EFIE) is traditionally carried out with divergenceconforming sets of basis functions, like the RWG set. This enforces the normal ...