Stored energies in electric and magnetic current densities for small antennas
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In this article, the partial directivity to antenna Q-ratio, D/Q, for arbitrarily shaped struc... is investigated for a single antenna with arbitrary shape and antenna Q.Abstract:
Electric andmagnetic currents are essential to describe electromagnetic-stored energy, and the associated antenna Q and the partial directivity to antenna Q-ratio, D/Q, for arbitrarily shaped struc ...read more
Citations
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Journal ArticleDOI
Optimal Currents on Arbitrarily Shaped Surfaces
Lukas Jelinek,Miloslav Capek +1 more
TL;DR: In this paper, the Rao-Wilton-Glisson basis representation is used to simplify the underlying algebra while still allowing surface current regions of arbitrary shape to be treated, and it is shown that the optimal current can, in principle, be found as a combination of a few eigenmodes.
Journal ArticleDOI
An analytical assessment of finite element and isogeometric analyses of the whole spectrum of Timoshenko beams
TL;DR: In this paper, the theoretical results relevant to the vibration modes of Timoshenko beams are used as benchmarks for assessing the correctness of the numerical values provided by several finite element models, based on either the traditional Lagrangian interpolation or on the recently developed isogeometric approach.
Journal ArticleDOI
Antenna Q and Stored Energy Expressed in the Fields, Currents, and Input Impedance
Mats Gustafsson,B. L. G. Jonsson +1 more
TL;DR: In this paper, the stored energy of an antenna is defined from the difference between the energy density and the far field energy for many but not all cases, and the results indicate that stored energy in the fields, currents, and circuit models agree well for small antennas.
Journal ArticleDOI
Tradeoff Between Antenna Efficiency and Q-Factor
TL;DR: It is observed that small increases in Q-factor away from its lower bound allow for dramatic increases in efficiency toward its upper bound, and the tradeoff evaluation method is valid for studying arbitrary antenna geometries.
Antenna Current Optimization using MATLAB and CVX
TL;DR: This paper presents a tutorial description of antenna current optimization, a tool that offers many possibilities in antenna technology to optimize the antenna current for strip dipoles and planar rectangles and codes and numerical results for maximization of the gain to Q-factor quotient and minimization for prescribed radiated fields.
References
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Book
Convex Optimization
Stephen Boyd,Lieven Vandenberghe +1 more
TL;DR: In this article, the focus is on recognizing convex optimization problems and then finding the most appropriate technique for solving them, and a comprehensive introduction to the subject is given. But the focus of this book is not on the optimization problem itself, but on the problem of finding the appropriate technique to solve it.
Book
Time-harmonic electromagnetic fields
TL;DR: In this paper, a revised version of the Revised edition of the book has been published, with a new introduction to the concept of plane wave functions and spherical wave functions, as well as a detailed discussion of the properties of these functions.