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### Conferences related to MLFMA

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting

The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science

2020 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)

This symposium pertains to the field of electromagnetic compatibility.

2019 13th European Conference on Antennas and Propagation (EuCAP)

The conference provides an overview of the state of the art developments and innovations in Antennas, Propagation, and Measurements, highlighting the latest requirements for future applications.

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)

The 21th edition of the ICEAA is coupled to the 9th edition of the IEEE-APWC. The two conferences consist of invited and contributed papers, and share a commonorganization, registration fee, submission site, workshops and short courses, and social events.The proceedings of both conferences will be published on IEEE Xplore

2019 International Workshop on Antenna Technology (iWAT)

The International Workshop on Antenna Technology (iWAT) is an annual forum for the exchange of information on the progress of research and development in innovative antenna technology. It especially focuses on small antennas and applications of advanced and artificial materials to the antenna design. At iWAT, all the oral presentations are delivered by invited prominent researchers and professors. iWAT has a particular focus on posters by which authors have the opportunity to interact with leading researchers in their fields. iWAT is a series of annual international antenna workshops which has been held in Singapore (2005), White Plaines, USA (2006), Cambridge, UK (2007), Chiba, Japan (2008), Santa Monica, USA (2009), Lisbon, Portugal (2010), Hong Kong, China (2011), Tucson, USA (2012), Karlsruhe, Germany (2013), Sydney, Australia (2014), South Korea (2015), Orlando, USA (2016), Athens, Greece (2017), Nanjing, China (2018).

### Periodicals related to MLFMA

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.

IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.

It is expected that GRS Letters will apply to a wide range of remote sensing activities looking to publish shorter, high-impact papers. Topics covered will remain within the IEEE Geoscience and Remote Sensing Societys field of interest: the theory, concepts, and techniques of science and engineering as they apply to the sensing of the earth, oceans, atmosphere, and space; and ...

Theory, concepts, and techniques of science and engineering as applied to sensing the earth, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.

All aspects of optical guided-wave science, technology, and engineering in the areas of fiber and cable technologies; active and passive guided-wave componentry (light sources, detectors, repeaters, switches, fiber sensors, etc.); integrated optics and optoelectronics; systems and subsystems; new applications; and unique field trials.

### Xplore Articles related to MLFMA

Proceedings of the IEEE, 2013

Due to its _O_(_N_ log _N_) complexity, the multilevel fast multipole algorithm (MLFMA) is one of the most prized algorithms of computational electromagnetics and certain other disciplines. Various implementations of this algorithm have been used for rigorous solutions of large-scale scattering, radiation, and miscellaneous other electromagnetics problems involving 3-D objects with arbitrary geometries. Parallelization of MLFMA is crucial for solving ...

Solving radiation and scattering problems in the vicinity of a half-space or stratified medium with integral equation methods is complicated, and slowed by computation of expensive Sommerfeld integrals. In this paper, a new formulation of the spectral layered media Green's function is presented. It is demonstrated for a simple scattering problem in the new fast algorithm called the Multipole-Free Fast ...

2005 IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2005

As the fastest integral equation solver up to now, multilevel fast multipole algorithm (MLFMA) has been applied successfully to solve electromagnetic scattering and radiation from 3D electrically large object. But for very large scale problems, the storage and CPU time required in MLFMA are still expensive. In this paper, a local multilevel fast multipole algorithm (LMLFMA) is proposed to further ...

IEEE Microwave and Wireless Components Letters, 2001

One of the most important mathematical formulas in fast multipole algorithms (FMA) is the addition theorem. In the numerical implementation of the addition theorem, the infinite series should be truncated. In this paper, the number of terms needed for the scalar Green's function is derived, and the error analysis for the truncation error in the multipole expansion of the vector ...

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018

We consider array configurations of chipless tags for radio-frequency- identification (RFID) applications. The drawbacks of chipless RFID tags, e.g., short reading range, can be mitigated by arranging multiple tags in array configurations. However, the strategy for arrangements of individual tags can be critical, especially to avoid destructive electromagnetic coupling between them. Using a numerical implementation, we investigate different strategies and ...

### Educational Resources on MLFMA

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• Due to its _O_(_N_ log _N_) complexity, the multilevel fast multipole algorithm (MLFMA) is one of the most prized algorithms of computational electromagnetics and certain other disciplines. Various implementations of this algorithm have been used for rigorous solutions of large-scale scattering, radiation, and miscellaneous other electromagnetics problems involving 3-D objects with arbitrary geometries. Parallelization of MLFMA is crucial for solving real-life problems discretized with hundreds of millions of unknowns. This paper presents the hierarchical partitioning strategy, which provides a very efficient parallelization of MLFMA on distributed-memory architectures. We discuss the advantages of the hierarchical strategy over previous approaches and demonstrate the improved efficiency on scattering problems discretized with millions of unknowns.

• Solving radiation and scattering problems in the vicinity of a half-space or stratified medium with integral equation methods is complicated, and slowed by computation of expensive Sommerfeld integrals. In this paper, a new formulation of the spectral layered media Green's function is presented. It is demonstrated for a simple scattering problem in the new fast algorithm called the Multipole-Free Fast Inhomogeneous Plane Wave Algorithm (MF-FIPWA). MF- FIPWA is shown to scale as <tex>$\mathcal{O}$</tex>(N log N) in memory usage and processing time. Additional advantages include rigorous treatment of reflected contributions, simplicity in design, and mathematical insight into the fast algorithm.

• As the fastest integral equation solver up to now, multilevel fast multipole algorithm (MLFMA) has been applied successfully to solve electromagnetic scattering and radiation from 3D electrically large object. But for very large scale problems, the storage and CPU time required in MLFMA are still expensive. In this paper, a local multilevel fast multipole algorithm (LMLFMA) is proposed to further speed up the efficiency of MLFMA in conjugate gradient (CG) iteration. In the LMLFMA, only the local interactions between the subscatters are taken into account. And, the interaction regions in iteration are varying adaptively with iterative current density. With decrease of iterative error, iterative current density tends to real one, the interaction regions required are diminishing. When the iterative error is less than a critical iteration error, only the interaction between nearby regions at the finest level is considered. Numerical results show that the LMLFMA has good accuracy, and much better efficiency than traditional MLFMA.

• One of the most important mathematical formulas in fast multipole algorithms (FMA) is the addition theorem. In the numerical implementation of the addition theorem, the infinite series should be truncated. In this paper, the number of terms needed for the scalar Green's function is derived, and the error analysis for the truncation error in the multipole expansion of the vector Green's functions is given. We have found that the error term in vector Green's functions is proportional to 1/R. If the scalar Green's function is truncated at the L-th term and the relative error is /spl epsiv/, then the relative error in the dyadic Green's function is /spl epsiv//4, if it is truncated at the (L+2)-th term. For the vector Green's function related to MFIE, the relative error is /spl epsiv//2 if it is truncated at the (L+1)-th term.

• We consider array configurations of chipless tags for radio-frequency- identification (RFID) applications. The drawbacks of chipless RFID tags, e.g., short reading range, can be mitigated by arranging multiple tags in array configurations. However, the strategy for arrangements of individual tags can be critical, especially to avoid destructive electromagnetic coupling between them. Using a numerical implementation, we investigate different strategies and array configurations in order improve the performances of chipless RFID systems in terms of readability and reliability. This paper presents initial results to demonstrate the importance of array configurations.

• This paper researches on low-frequency scattering problem that has covered a large variety of models: simple PEC structure, PEC with wires and junctions, homogeneous penetrable scatterers and composite objects. Accurate numerical results have been generated for many demonstrating examples as well as practical application models.

• This paper presents a simplified near-field preconditioner based on multi- level fast multipole algorithm (MLFMA). The preconditioner attains a low computation complexity, has no influence on memory requirement and is easy to be parallelized. It shows good performance in numerical experiments and is applied in solving a very large scale problem.

• A new formalism for modeling electromagnetic propagation on, and scattering from, planar microwave structures is presented. The new technique uses the Perfectly Matched Layer (PML) paradigm to construct an efficient Multilevel Fast Multipole Algorithm (MLFMA) for evaluating fields generated by electric current sources residing in a layered background medium. Depending on the nature of the microstrip metallization, the proposed scheme achieves a computational complexity of O(N) or O(N log<sup>2</sup> N).

• The discrete dipole approximation (DDA) developed by Purcell and Pennypacker (1973) is a powerful and quite general method to calculate the scattering from arbitrary particles and has been applied to a variety of problems such as calculations of the scattering from graphite grains and porous dust particles. In the DDA, a continuum target is replaced by an array of point dipoles which interact with each other and a consistent solution is sought. Direct inversion of the matrix is not feasible for most problems due to the huge number of unknowns and iterative solutions become inevitable. In this work, the multilevel fast multipole algorithm (MLFMA) is used. The fast multipole algorithm (FMA) was successfully used for different problems, and the complexity of the MLFMA is O(N) for densely packed particles, and O(NlogN) for sparse and/or nonuniform distribution of particles, for any prescribed degree of accuracy. This is clearly an improvement over the FFT method.

• Summary form only given. Enforcing continuity of the approximated field between elements of the mesh can improve accuracy of a numerical solution as well as conditioning of its impedance matrix (M. Shafieipour, et. al., IEEE Trans. Antennas Propag., 99, 1-11, 2013). In the class of low-order solutions, Rao-Wilton-Glisson (RWG) basis functions are widely used in the numerical solution of electromagnetic scattering problems and they have been recently suggested in conjunction with first-order Locally Corrected Nystrom (LCN) method when solution of the Electric Field Integral Equation (EFIE) is perused (M. Shafieipour, et. al., IEEE Trans. Antennas Propag., 99, 1-11, 2013), resulting in a current-continuity-enforcing point-based discretization scheme (RWG-via-LCN) which can efficiently be accelerated by the Multilevel Fast Multipole Algorithm (MLFMA). However, it is known that the LCN method suffers from low-frequency breakdown (J. C. Young, et. al., IEEE Antennas. Wireless. Propag. Lett., 11, 846-849, 2012) when trying to solve for the EFIE as LCN discretizes the vector-potential EFIE as opposed to the mixed-potential EFIE. In this work we show that the RWG-via-LCN method inherits the low-frequency breakdown from the LCN method. As a remedy, we introduce a new RWGvia-LCN scheme which is a mixture of zerothand first-order discretization of the EFIE and we show that it is equivalent to the mixed-potential RWG MoM. The new method preserves all advantages of the RWG-via-LCN method (i.e. point-based and current-continuity-enforcing) and at the same time enjoys a wide-band solution and is computationally more efficient as it uses zeroth-order EFIE to compute the scalar potential contribution.

### Standards related to MLFMA

No standards are currently tagged "MLFMA"