Improved Electromagnetics Optimization: The covariance matrix adaptation evolutionary strategy

Gregory, Micah D.; Martin, Spencer V.; Werner, Douglas H.

doi:10.1109/map.2015.2437277

Cited by 32 publications

(9 citation statements)

References 40 publications

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“…This necessitates the use of an optimization procedure. The Covariance Matrix Adaptation Evolutionary Strategy (CMA-ES) is a global optimization algorithm that has been shown to be well suited to finding solutions for a wide variety of electromagnetics problems 23,24 . In this case, CMA-ES was paired with HFSS, a commercial computational electromagnetics solver, to optimize the geometry and metasurface characteristics of the A-SBFA, with the goal of maximizing peak directivity at GPS bands L1 (1.575 GHz) and L2 (1.227 GHz).…”

Section: Resultsmentioning

confidence: 99%

A metamaterial-enabled design enhancing decades-old short backfire antenna technology for space applications

et al. 2019

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Nearly two decades of intense study have passed since the term metamaterials was first introduced in 1999. In spite of their great promise, however, metamaterials have been slow to find their way into practical devices, and examples of real-world applications remain rare. In this paper, an Advanced Short Backfire Antenna (A-SBFA), augmented with anisotropic metamaterial surfaces (metasurfaces), has been designed to achieve a very high aperture efficiency across two frequency bands. This performance is unprecedented for an antenna that has seen widespread use, but few design changes over its more than 50 year existence. The reduced weight, compact design, hexagonal aperture, high dual-band efficiency, high cross-polarization isolation, as well as low multipaction and passive intermodulation (PIM) risk make the A-SBFA ideal for spaceborne applications. This transformative design demonstrates how practical metamaterials, when applied to conventional antenna technology, can provide significant performance enhancements.

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Section: Resultsmentioning

confidence: 99%

A metamaterial-enabled design enhancing decades-old short backfire antenna technology for space applications

et al. 2019

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“…Global optimization algorithms are largely able to overcome these issues. While nearly countless examples of global optimizers exist today, algorithms such as the genetic algorithm (GA) [297,298], particle swarm optimization (PSO) [299,300], and the covariance matrix adaptation evolution strategy (CMA-ES) [301][302][303] are among the most popular for optical device optimization [283]. Most global optimizers are population-based evolutionary algorithms which update and adapt a population as they explore a function's response surface to produce new generations better suited to finding the true global minimum.…”

Section: Advanced Design and Optimization: Toward Multifunctional Metmentioning

confidence: 99%

Design for quality: reconfigurable flat optics based on active metasurfaces

et al. 2020

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Optical metasurfaces, planar subwavelength nanoantenna arrays with the singular ability to sculpt wavefront in almost arbitrary manners, are poised to become a powerful tool enabling compact and high-performance optics with novel functionalities. A particularly intriguing research direction within this field is active metasurfaces, whose optical response can be dynamically tuned postfabrication, thus allowing a plurality of applications unattainable with traditional bulk optics. Designing reconfigurable optics based on active metasurfaces is, however, presented with a unique challenge, since the optical quality of the devices must be optimized at multiple optical states. In this article, we provide a critical review on the active meta-optics design principles and algorithms that are applied across structural hierarchies ranging from single meta-atoms to full meta-optical devices. The discussed approaches are illustrated by specific examples of reconfigurable metasurfaces based on optical phase-change materials.

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“…A variety of optimizations will be carried out here to highlight the utility of the analytical expressions. CMA-ES [32] has been found to be extremely effective in single-objective optimizations for electromagnetics problems [33][34]. In real-world engineering problems, there are often multiple conflicting objectives, with a classical example being size versus performance.…”

Section: Optimization Examplesmentioning

confidence: 99%

Optimization of Far-Field Radiation From Impedance-Loaded Nanoloops Accelerated by an Exact Analytical Formulation

Nagar

Chaky

Pantoja

et al. 2019

IEEE Trans. Antennas Propagat.

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Impedance loading is a common technique traditionally used in the RF to enhance the performance of an antenna, but its application in the optical regime is not as rigorously studied. This is mainly due to a lack of exact analytical expressions that can be used to rapidly predict the radiation properties of loaded nanoantennas. This paper will derive a set of useful analytical expressions for the far-field radiation properties of loop antennas loaded with an arbitrary number of lumped impedances that are valid from the RF to optical regimes. The analytical expressions will be validated with full-wave solvers and can be evaluated more than 100x faster. The ability to perform such rapid evaluations enables, for the first time, large-scale single-and multi-objective optimizations. A series of optimizations reveal that electrically small super-directive antennas can be achieved at a variety of far field angles through capacitive loading, paving the way for a pattern reconfigurable antenna. In addition, gains of greater than 3 dB can be achieved for electrically small antennas over a fractional bandwidth of 28%. Finally, it is shown that impedance loading can be used to achieve circularly polarized radiation from a single loop.

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Improved Electromagnetics Optimization: The covariance matrix adaptation evolutionary strategy

Cited by 32 publications

References 40 publications

A metamaterial-enabled design enhancing decades-old short backfire antenna technology for space applications

A metamaterial-enabled design enhancing decades-old short backfire antenna technology for space applications

Design for quality: reconfigurable flat optics based on active metasurfaces

Optimization of Far-Field Radiation From Impedance-Loaded Nanoloops Accelerated by an Exact Analytical Formulation

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