Download PDF by Randy L. Haupt: Genetic Algorithms in Electromagnetics

By Randy L. Haupt

ISBN-10: 0471488895

ISBN-13: 9780471488897

A thorough and insightful advent to utilizing genetic algorithms to optimize electromagnetic systems

Genetic Algorithms in Electromagnetics makes a speciality of optimizing the target functionality while a working laptop or computer set of rules, analytical version, or experimental outcome describes the functionality of an electromagnetic approach. It deals professional suggestions to optimizing electromagnetic platforms utilizing genetic algorithms (GA), that have confirmed to be tenacious to find optimum effects the place conventional suggestions fail.

Genetic Algorithms in Electromagnetics starts off with an creation to optimization and several other ordinary numerical optimization workouts, and is going directly to feature:

  • Introductions to GA in either binary and non-stop variable kinds, entire with examples of MATLAB(r) commands
  • Two step by step examples of optimizing antenna arrays in addition to a entire evaluation of purposes of GA to antenna array layout problems
  • Coverage of GA as an adaptive set of rules, together with adaptive and clever arrays in addition to adaptive reflectors and crossed dipoles
  • Explanations of the optimization of numerous varied cord antennas, beginning with the recognized "crooked monopole"
  • How to optimize horn, reflector, and microstrip patch antennas, which require considerably extra computing energy than twine antennas
  • Coverage of GA optimization of scattering, together with scattering from frequency selective surfaces and electromagnetic band hole materials
  • Ideas on operator and parameter choice for a GA
  • Detailed reasons of particle swarm optimization and a number of target optimization
  • An appendix of MATLAB code for experimentation

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Sample text

The resulting crystal is an example of nature finding an optimal solution. If the liquid cools too rapidly, then the crystals do not form and the substance becomes an amorphous mass with an energy state above optimal. Nature is seldom in a hurry to find the optimal state. A numerical optimization algorithm that models the annealing process is known as simulated annealing [28,29]. The initial state of the algorithm is a single random guess of the objective function input variables. In order to model the heating process, the values of the variables are randomly modified.

REFERENCES 27 12. D. K. Cheng, Optimization techniques for antenna arrays, Proc. IEEE 59(12):1664– 1674 (Dec. 1971). 13. J. F. DeFord and O. P. Gandhi, Phase-only synthesis of minimum peak sidelobe patterns for linear and planar arrays, IEEE AP-S Trans. 36(2):191–201 (Feb. 1988). 14. J. E. Richie and H. N. Kritikos, Linear program synthesis for direct broadcast satellite phased arrays, IEEE AP-S Trans. 36(3):345–348 (March 1988). 15. M. I. Skolnik, G. Nemhauser, and J. W. Sherman, III, Dynamic programming applied to unequally spaced arrays, IEEE AP-S Trans.

This approach uses the steepest descent as its first step. 25) requires calculation of the Hessian, αm is usually found by minimizing f(vm + αm m). 27) 18 INTRODUCTION TO OPTIMIZATION IN ELECTROMAGNETICS This formulation converges when the starting point is sufficiently close to the minimum. 28) The nonlinear conjugate gradient algorithm is guaranteed to converge for linear functions but not for nonlinear functions. The problem with conjugate gradient is that it must be “restarted” every N iterations.

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Genetic Algorithms in Electromagnetics by Randy L. Haupt

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