A. Mori

A BMIA/AIM formulation for the analysis of large stacked patch antennas

An efficient technique based on the extension of the Banded Matrix Iterative Approach (BMIA) to a non-canonical grid by using the Adaptive Integral Method (AIM) is presented for the analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled by means of triangular elements.

A BMIA/nCAG formulation for the analysis of large stacked patch antennas

An efficient technique based on the extension of the Banded Matrix Iterative Approach (BMIA) to a non-canonical grid by using the Adaptive Integral Method (AIM) is presented for the analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled by means of triangular elements.An efficient technique based on the extension of the banded matrix iterative approach (BMIA) to a BMIA not canonical grid (BMIA/nCAG) is presented for an efficient analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled by means of triangular elements.

A Surface PEEC Formulation for High-Fidelity Analysis of the Current Return Networks in Composite Aircrafts

This paper describes the approach developed to model the current return networks installed aboard aircrafts having parts made in composite materials. The surface partial element equivalent circuit (PEEC) method is adopted for its high-fidelity modeling capabilities, and its accuracy in the low-frequency region, which is of interest for the characterization of the return networks. State of the art of PEEC modeling is implemented in order to allow real-life aircrafts to be modeled. A special complex mock-up has been realized and measured. The numerical results are compared with measurements to assess their adequacy.

Hierarchical Bases Preconditioner to Enhance Convergence of CFIE With Multiscale Meshes

A hierarchical quasi-Helmholtz decomposition, originally developed to address the dense-discretization breakdowns for the electric field integral equation, is applied together with an algebraic preconditioner to improve the convergence of the combined field integral equation in multiscale problems. The effectiveness of the proposed method is studied first on some simple examples; next, tests on real-life cases up to several hundreds of wavelengths show its good performance.

Broadband full-wave frequency domain PEEC solver using effective scaling and preconditioning for SIPI models

In this paper, a new iterative full-wave frequency domain PEEC solver is proposed. Based on the classical modified nodal analysis, the convergence of the iterative solution is optimized by resorting to a pertinent scaling of sub-matrices which improves the conditioning of the global left hand side matrix and to a multiscale-based effective preconditioner. The efficiency of the proposed approach in terms of either accuracy and number of iterations is demonstrated through its application to a relevant problem.

Estimation of the Electric Field Generated by Power Lines With the Adaptive Integral Method

The electric field generated by power lines is usually evaluated by a simple 2-D model. Due to the presence of buildings or other objects near the power line, measurements are often in disagreement with the model. In this letter, the adaptive integral method (AIM) is used to analyze a power line in a real environment. The presence of a conducting ground plane, as well as a planar dielectric interface, is also efficiently built into the algorithm.

Rigorous DC Solution of Partial Element Equivalent Circuit Models

This paper presents a rigorous dc solution of 3-D Partial Element Equivalent Circuit models. Despite the decoupling of magnetic and electric fields at dc, the correct solution is not trivial. The proposed one is based on a two-step process where first the magnetostatic problem is solved; then, the electrostatic problem is faced by using the solution of the magnetostatic problem as boundary conditions and enforcing the neutrality of disconnected objects. A systematic partition computation is presented which is based on graph algorithms. Applications to the dc analysis of multiple connected and/or disconnected conductors demonstrate the accuracy of the proposed method when compared to the steady state analysis under step excitation.

On the Use of the Adaptive Integral Method in the Presence of Perfectly Conducting Perpendicular Planes

The adaptive integral method (AIM) is widely used to solve electromagnetic scattering and radiation problems involving large objects in free space. In the presence of one or more perfectly conducting perpendicular planes, the AIM formulation can be applied by exploiting the principle of images at the cost of increasing the number of fast Fourier transforms evaluated in the method. In this letter, we show how to obtain an efficient scheme with respect to a plain application of the principle of images.

BMIA/AIM formulation for the electromagnetic analysis of large patch arrays

An efficient technique based on the extension of the banded matrix iterative approach (BMIA) to a not canonical grid by using the adaptive integral method (AIM) is presented for the analysis of stacked patch antennas of large dimensions. The patches can have arbitrary shape and orientation and are modeled with subdomain triangular patch basis functions. The method allows us to use a FTT-CG scheme reducing the CPU time per iteration to O(N log N) and the memory requirement to O(N). Therefore, the approach is suitable for solving large-scale problems on a small computer.

Modelling of electromagnetic scattering from large and general intakes on complex platforms

In the framework of the design of low observable aircraft, one of the most difficult problem is the numerical modelling of aeronautical air intakes with an — usually complex — arbitrary shape. Also the presence of radio absorbing material demands for accurate methods in evaluating the low level scattering for real life problems. In this contribution the use of a full wave approach, based on the Multilevel Fast Multipole Approach (MLFMA) is addressed, for a high fidelity modelling of the whole (real life) aircraft as well as the intake contribution, useful in the design and optimization stage of the intake itself.