Magnetic Susceptibility Estimation for Magnetostatics

This paper presents a parameter estimation method to determine the linear behavior of an object constructed of thin plates. Based on the magnetostatic field equations, an integral equation is derived that fully determines the induced magnetization, whenever the spatial magnetic susceptibility distribution is known. This forward problem is used...

Towards a vortex generator model for integral boundary layer methods

In this study a new approach to model the effect of vortex generators in integral boundary layer equations is described. Vortex generators (VGs) are commonly used on wind turbine blades to avoid early separation of flow which helps not only to increase the lift but also delays the stall. Delaying the stall angle of wind turbine blades will allow...

Integration of functions within STUAS operator crew on board royal Netherlands Navy ships

Many reasons exist for the military to favor unmanned systems and future missions are envisioned that require longer, more diverse and more frequent deployment of UAVs with increased mission precision. This will also result in a much higher demand on operator crews working with UAVs. With the current pressure on operational budgets, a more...

Interpolation Algorithm for Fast Evaluation of EM Coupling between Wires

Efficient and accurate evaluation of the EM field radiated by a current flowing along a wire is essential to solve the electromagnetic coupling between arbitrary oriented wires. In this paper, a numerically efficient algorithm for the evaluation of coupling is presented. The currents along the wires are expressed in terms of local basis...

Multimode equivalent networks for the design and analysis of frequency selective surfaces

A modular technique originally proposed for waveguide junctions, the multimode equivalent network approach based on the integral equation formulation (IEMEN), is extended to the analysis of multilayer Frequency Selective Surfaces integrated with waveguide array antennas. This technique represents each layer and transition between layers in terms...

Reduced Kernel IE's for MEN Based Analysis of Multilayered FSS Structures

Despite the fact that the general behavior of periodic structures has been investigated for many decades, the analysis and design of multilayered FSS's is still a very actual and complicated problem. This is especially true for stringent requirements, which rise for example when the FSS has to be integrated with a planar phased array. A MEN...

A Novel Technique for the Design of Frequency Selective Structures Integrated with a Waveguide Array

A single mode model and a full multimode equivalent network (MEN) approach have been adopted for the design of an FSS integrated phased array. The single mode equivalent transmission line model allows a systematic design of the FSS, starting from the requirements, and the results of this simple design procedure are similar to well known...

Planar circularly symmetric EBG structures - Design and analysis

This paper deals with the design and the analysis of planar circularly symmetric (PCS) EBG structures. The analysis is concentrated on TM excitations. To obtain simple design rules for the PCS-EBG's, an equivalence is established between 2D-EBG's and PCS-EBG's. he dispersion equations are investigated first. The 2D problems are studied by means...

Problem-Matched Basis Functions for Microstrip Coupled Slot Antennas based on Transmission Line Greens Functions

A general algorithm for the analysis of microstrip coupled leaky wave slot antennas was discussed. The method was based on the construction of physically appealing entire domain Methods of Moments (MoM) basis function that allowed a consistent reduction of the number of unknowns and of total computation time. The basis function obtained were...

Phased arrays of rectangular apertures on conformal cylindrical surfaces: A multimode equivalent network approach

In this paper, we present an efficient integral equation formulation based on a multimode equivalent network (MEN) approach for the analysis of phased arrays on cylindrical surfaces using open-ended waveguide radiators. In addition to theory, experimental data are also presented showing very good agreement with simulated results. © 2004 IEEE.

Problem-Matched Basis Functions for Microstrip Coupled Slot Arrays based on Transmission Line Green+s Functions (TLGF)

A method is proposed for the analysis of arrays of linear printed antennas. After the formulation of pertinent set of integral equations, the appropriate equivalent currents of the Method of Moments are represented in terms of two sets of entire domain basis functions. These functions synthesize on one side the resonant behavior of the slot,...

Green's function for an infinite slot printed between two homogeneous dielectrics - Part I: Magnetic currents

This sequence of papers presents an analytical closed form for the Green's function of an infinite slot printed between two different homogeneous dielectrics. This first part is devoted to the derivation of the slot magnetic current and to the discussion of the relevant physical implications. The Fourier spectrum of the magnetic current is...

A constrained conjugate gradient method for solving the magnetic field boundary integral equation

It is well-known that electromagnetic solutions of boundary integral equations for perfectly electrically conducting scatterers are nonunique for those frequencies which correspond to interior resonances of the scatterer. In this paper a simple and efficient computational method is developed, in which the interior integral representations,...

Time-domain gradient-type methods for inversion of the subsurface

The inverse problem of reconstructing a scattering object in a two-media background was analyzed using time-domain gradient-type method. The scattering object was illuminated successively by line sources located in the upper medium. The incident field from the line source was calculated using a spatial Fourier transforms in the x1-direction and...

On the feasibility of detecting flaws in artificial heart valves

In this paper, we investigate the feasibility of detecting defects in certain artificial heart valves by determining the electromagnetic behavior of some simple models with the aid of thin-wire integral equations. The idea is to use the stationary current that occurs at late times after the excitation of a closed loop as a discriminator. This...