Keywords: equations : differentielles ; equations : lineaires ; elements : finis Reference Record created on 2005-11-18, modified on 2016-08-08

Numerical solution partial differential equations in science and engineering

This paper provide a review of the active integrated antenna (AIA) technologies. After a brief introduction on the definition and some historical remarks, the paper concentrates on the research effort on the past decades or so. The AlAs are reviewed in its various functions. First, an oscillator-type AIA is presented, followed by very interesting aspects of coupled oscillator arrays for phase control. Use of an AIA concept for efficient RF front ends is described with examples on high-power amplifier AlAs. Next, a phase-conjugation-based retrodirective array is reviewed. Finally, AIA systems for receiving, transmitting, and duplexing are reviewed.

Active integrated antennas

Introduction to the Finite-Difference Time-Domain (FDTD) Method for Electromagnetics provides a comprehensive tutorial of the most widely used method for solving Maxwell's equations -- the Finite Difference Time-Domain Method. This book is an essential guide for students, researchers, and professional engineers who want to gain a fundamental knowledge of the FDTD method. It can accompany an undergraduate or entry-level graduate course or be used for self-study. The book provides all the background required to either research or apply the FDTD method for the solution of Maxwell's equations to practical problems in engineering and science. Introduction to the Finite-Difference Time-Domain (FDTD) Method for Electromagnetics guides the reader through the foundational theory of the FDTD method starting with the one-dimensional transmission-line problem and then progressing to the solution of Maxwell's equations in three dimensions. It also provides step by step guides to modeling physical sources, lumped-circuit components, absorbing boundary conditions, perfectly matched layer absorbers, and sub-cell structures. Post processing methods such as network parameter extraction and far-field transformations are also detailed. Efficient implementations of the FDTD method in a high level language are also provided. Table of Contents: Introduction / 1D FDTD Modeling of the Transmission Line Equations / Yee Algorithm for Maxwell's Equations / Source Excitations / Absorbing Boundary Conditions / The Perfectly Matched Layer (PML) Absorbing Medium / Subcell Modeling / Post Processing

Introduction to the Finite-Difference Time-Domain (Fdtd) Method for Electromagnetics

The finite-difference time-domain (FDTD) method is arguably the most popular numerical method for the solution of problems in electromagnetics. Although the FDTD method has existed for nearly 30 years, its popularity continues to grow as computing costs continue to decline. Furthermore, extensions and enhancements to the method are continually being published, which further broaden its appeal. Because of the tremendous amount of FDTD-related research activity, tracking the FDTD literature can be a daunting task. We present a selective survey of FDTD publications. This survey presents some of the significant works that made the FDTD method so popular, and tracks its development up to the present-day state-of-the-art in several areas. An "on-line" BibT/sub E/X database, which contains bibliographic information about many FDTD publications, is also presented. >

A selective survey of the finite-difference time-domain literature

PULSE GENERATION AND DETECTION: Semiconductor Switching: The Time Evolution of Photonic Crystal Bandgaps (K. Agi et al.). General: Ultrawideband Pulser Technology (D.M. Parkes). ANTENNAS: Impulse Radiating Antennas: Transient Fields of Rectangular Aperture Antennas (S.P. Sulkin). Reflector Impulse Radiating Antennas: Temporal and Spectral Radiation on Boresight of a Reflector Type of Impulse Radiating Antenna (IRA) (D.V. Giri, C.E. Baum). Lens Impulse Radiating Antennas and TEM Horns: Design of the Low-Frequency Compensation of an Extreme-Bandwidth TEM Horn and Lens IRA (M.H. Vogel). Arrays: Transient Arrays (C.E> Baum). General: Some Basic Properties of Antennas Associated with Ultra-wideband Radiation (S.N. Samaddar, E.L. Mokole). PULSE PROPOGATION AND GUIDEANCE: Transient Dielectric Coefficient and Conductance in Dielectric Media in Nonstationary Fields (A. Gutman). SCATTERING THEORY, COMPUTATION, AND MEASUREMENTS: Early Time Signature Analysis of Dielectric Targets Using UWB Radar (S. Cloude et al.). SIGNAL PROCESSING: Time-Frequency Analysis: Feature Extraction from Electromagnetic Backscattered Data Using Joint Time-Frequency Processing (L.C. Trintinalia, H. Ling). Spectral Techniques: The E-Pulse Technique for Dispersive Scatterers (S. Primak et al.). Probabilistic Considerations: Robust Target Identification Using a Generalized Likelihood Ratio Test (J.E. Mooney et al.). General: Error Correction in Transient Electromagnetic Field Measurements Using Deconvolution Techniques (J-Z. Bao et al.). BROADBAND ELECTRONIC SYSTEMS AND COMPONENTS: Systems and Components: Ultra-wideband Sources and Antennas: Present Technology, Future Challenges (W.D. Prather et al.). Ultra-Wideband Radars: Dense Media Penetrating Radar (K. Min, M. Willis, Jr.). Polarimetric Ultra-wideband Radars: Polarimetry in Ultra-wideband Interferometric SEnsing and Imaging (W-M. Boerner, J.S. Verdi). BURIED TARGETS: Analytic Methods for Pulsed Signal Interaction with Layered, Lossy Soil Environments and Buried Objects (L.B. Felsen). 41 additional articles. Index.

/pdf/ultra-wideband-short-pulse-electromagnetics-2-1ljj2j04ig.pdf

Ultra-wideband, short-pulse electromagnetics 2

Coupled FDTD-SPICE simulations are performed for an active antenna problem. The results are comparable to previously published results using FDTD in conjunction with special integration techniques for the nonlinear elements. Some differences occur, and better agreement with experiment is observed for our newer approach. The main advantages are that all of the SPICE device models are directly available for FDTD modeling and the efficient SPICE integration schemes can be used directly. No user intervention is required for either the device models or the integration schemes. >

FDTD analysis of an active antenna

The finite-difference time-domain (FDTD) method is extended to include nonlinear active regions embedded in distributed circuits. The procedures necessary to produce a stable algorithm are described, and a single device cavity oscillator is simulated with this method. >

Modeling of nonlinear active regions with the FDTD method

The FDTD algorithm is used to simulate a two element active antenna which is capable of three different coupled oscillation modes. This analysis correctly predicts which modes will be stable in the steady state under different loading conditions. The predicted oscillation modes, oscillation frequencies and radiation patterns are compared with experimental data. >

http://ieeexplore.ieee.org/iel5/1100/7886/00335216.pdf

Electromagnetic simulation of mode control of a two element active antenna

A transmission line with a trapezoidal cross section is analyzed using the boundary-element method (BEM) and the quasi-static approximation. By utilizing a convenient choice for the fundamental solution, the efficiency of the method is clearly established. The analysis is verified by comparisons with results in the literature and measured data. >

http://ieeexplore.ieee.org/iel4/75/3212/00103861.pdf

Boundary element analysis of a trapezoidal transmission line

A full-wave analysis is a transmission line with a trapezoidal cross-section is described. The boundary element method (BEM) is used, and by making a convenient choice for the dyadic Green's function, it is shown to be very efficient in comparison to alternative methods of analysis. It is shown that for electrically small dimensions, spurious solutions are suppressed by the selection of integral equations. The analysis is verified by comparisons to calculated results from a vector finite element computer program, and some dispersion data are presented. >

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Papers

FDTD analysis of an active antenna

Modeling of nonlinear active regions with the FDTD method

Electromagnetic simulation of mode control of a two element active antenna

Boundary element analysis of a trapezoidal transmission line

Boundary element analysis of a trapezoidal transmission line