Multiobjective Particle Swarm Optimization to Design a Time-Delay Equalizer Metasurface for an Electromagnetic Band-Gap Resonator Antenna

Lalbakhsh, Ali; Afzal, Muhammad U.; Esselle, Karu P.

doi:10.1109/lawp.2016.2614498

Cited by 178 publications

(103 citation statements)

References 9 publications

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“…However, these antennas need complicated feed networks which are difficult to design. Besides, the spiral phase plate (SPP) is a practical method to generate OAM beams . By changing the equivalent permittivity and the thickness of the unit cells of the plate simultaneously, an ultralow reflectivity SPP is obtained in Reference , but the SPP is not flat.…”

Section: Introductionmentioning

confidence: 99%

“…By changing the equivalent permittivity and the thickness of the unit cells of the plate simultaneously, an ultralow reflectivity SPP is obtained in Reference , but the SPP is not flat. To realize different phase shifts in a flat plate, many approaches for phase shift are analyzed and proposed . The drilled flat plate SPP introduces the phase shift by changing the angular variation of equivalent permittivity of the substrate through drilling holes in matter, but it does not take the insertion loss of the SPP into consideration.…”

Section: Introductionmentioning

confidence: 99%

“…The drilled flat plate SPP introduces the phase shift by changing the angular variation of equivalent permittivity of the substrate through drilling holes in matter, but it does not take the insertion loss of the SPP into consideration. By changing the size of the unit cell, different phase shifts can also be obtained in multilayer printed surface plates . In addition, different phase shifts can be obtained by varying the permittivity and thickness of the all‐dielectric plates …”

Section: Introductionmentioning

confidence: 99%

“…To realize different phase shifts in a flat plate, many approaches for phase shift are analyzed and proposed. 9,10,[12][13][14][15][16][17] The drilled flat plate SPP 9 introduces the phase shift by changing the angular variation of equivalent permittivity of the substrate through drilling holes in matter, but it does not take the insertion loss of the SPP into consideration. By changing the size of the unit cell, different phase shifts can also be obtained in multilayer printed surface plates.…”

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confidence: 99%

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Honeycombed metasurface plate for generation of X‐band orbital angular momentum beam

Guo

Yang

2019

Micro & Optical Tech Letters

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A honeycombed transmission metasurface based on hexagonal unit is proposed in this article for generation of orbital angular momentum (OAM) beam. The hexagonal metasurface unit is composed of five metal layers and is separated by four dielectric substrates. A metal layer with three etched crossed slots is placed in the middle of the substrates, and other four hexagonal metal layers with same dimensions are placed symmetrically on both sides. By simulating the unit comprehensively around the center frequency of 10 GHz, a list of units with good transmission coefficient and different phase shifts for metasurface design is obtained. Based on the hexagonal metasurface units, the configuration of the metasurface plate is presented and two models of +1 and +2 mode are designed accordingly. The simulated results show that the metasurface plate is insensitive to the incident wave polarization and is able to generate OAM beams from circularly polarized (CP) and linearly polarized (LP) incident plane waves. To validate the correctness of the simulation results, a +2 mode OAM metasurface plate is fabricated and measured, and a helical phase wavefront is obtained, which demonstrates the generation of OAM beam.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Honeycombed metasurface plate for generation of X‐band orbital angular momentum beam

Guo

Yang

2019

Micro & Optical Tech Letters

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“…In practice, it is commonly realized through parameter sweeping, however, optimum results can only be achieved by means of rigorous numerical optimization. Unfortunately, conventional optimization routines (eg, gradient‐based algorithms, pattern search, or population‐based metaheuristics such as genetic algorithms, differential evolution, or particle swarm optimizers) incur considerable computational expenses due to large numbers of antenna evaluations involved.…”

Section: Introductionmentioning

confidence: 99%

Improved trust-region gradient-search algorithm for accelerated optimization of wideband antenna input characteristics

Koziel

2018

Int J RF Microw Comput Aided Eng

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Full‐wave electromagnetic (EM) simulation models are ubiquitous in carrying out design closure of antenna structures. Yet, EM‐based design is expensive due to a large number of analyses necessary to yield an optimized design. Computational savings can be achieved using, for example, adjoint sensitivities, surrogate‐assisted procedures, design space dimensionality reduction, or similar sophisticated means. In this article, a simple modification of a rudimentary trust‐region‐embedded gradient search with numerical derivatives is proposed for reduced‐cost optimization of input characteristics of wideband antennas. The approach exploits information and history of relative changes of the design (as compared with the trust region size) during algorithm iterations to control the updates of components of the antenna response Jacobian, specifically, to execute them only if necessary. It is demonstrated that the proposed framework may lead to over 50% savings over the reference algorithm with only minor degradation of the design quality, specifically, up to 0.3 dB (or <3%). Numerical results are supported by experimental validation of the optimized antenna designs. The presented algorithm can be utilized as a stand‐alone optimization routine or as a building block of surrogate‐assisted procedures.

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Resonant Cavity Antennas

Hashmi

2019

Wiley Encyclopedia of Electrical and Electronics Engineering

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This article introduces resonant cavity antennas (RCAs) and leads the reader to develop an operational understanding of the design processes and considerations related to various types of RCAs. RCAs are a class of medium‐to‐high gain antennas, often having a single excitation location (as opposed to antenna arrays) and a simple configuration. These are a convenient alternative to antenna arrays and reflector antennas in space‐constrained applications where robustness, performance, and aesthetic appeal are equally important. The article discusses recent research results and trends particularly focusing on advances that have the potential to yield practical advantages, such as compactness, low profile, and high efficiency. The article reviews progress on gain bandwidth enhancement, achieving high aperture efficiency, multiband operation, and methods for aperture phase correction in RCAs.

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Multiobjective Particle Swarm Optimization to Design a Time-Delay Equalizer Metasurface for an Electromagnetic Band-Gap Resonator Antenna

Cited by 178 publications

References 9 publications

Honeycombed metasurface plate for generation of X‐band orbital angular momentum beam

Honeycombed metasurface plate for generation of X‐band orbital angular momentum beam

Improved trust-region gradient-search algorithm for accelerated optimization of wideband antenna input characteristics

Resonant Cavity Antennas

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