Design of graded index flat lenses with integrated antireflective properties

Good, Brandon; Ransom, Paul; Simmons, Shaun P.; Good, Austin; Mirotznik, Mark S.

doi:10.1002/mop.27198

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…Specifically, the ability to fabricate electromagnetic (EM) materials with graded dielectric properties within a structural composites would benefit a variety of interesting applications, such as low profile antennas [4,5], antireflective surfaces [6], passive beam formers (e.g. Luneburg Lenses) [7][8][9][10], graded index lenses [10,11], and structural and armored radomes.…”

Section: Multifunctional Composite Materialsmentioning

confidence: 99%

“…For ultra wideband performance, outer impedance matching layers were also integrated. These layers, which employed a motheye design technique described in [10], were machined from the thermoplastic REXOLITE TM . REXOLITE TM combines excellent electromagnetic and mechanical…”

Section: Materials Selectionmentioning

confidence: 99%

“…The first outer layers were realized using the motheye approach described in [10]. The motheye layers were fabricated out of 0.25" thick plates of REXOLITE TM and machined to give two different layers of dielectric constants.…”

Section: Fabrication and Experimental Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Additive manufacturing of graded dielectrics

Roper¹,

Good²,

McCauley³

et al. 2014

Smart Mater. Struct.

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A method for the fabrication of graded dielectrics within a structural composite is presented. This system employs an ultrasonic powder deposition head to print high dielectric powders onto a woven fabric composite substrate. It is shown how this system can integrate 3D variations of dielectric properties at millimeter resolution within a mechanically rugged substrate. To conclude, the system’s practical application is demonstrated with experimental results from a graded index lens.

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Section: Multifunctional Composite Materialsmentioning

confidence: 99%

Section: Materials Selectionmentioning

confidence: 99%

See 1 more Smart Citation

Additive manufacturing of graded dielectrics

Roper¹,

Good²,

McCauley³

et al. 2014

Smart Mater. Struct.

Self Cite

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show abstract

“…Electromagnetic (EM) structures with spatially graded dielectric properties have a variety of practical applications including passive beam steering, graded index lenses (GRIN) [1] and antireflective surfaces [2]. However, fabricating structures with complicated EM properties that vary in three dimensions is challenging.…”

Section: Introductionmentioning

confidence: 99%

Use of space-filling curves for additive manufacturing of three dimensionally varying graded dielectric structures using fused deposition modeling

Larimore

Jensen

Parsons

et al. 2017

Additive Manufacturing

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In this paper the authors present a novel design tool for realizing dielectric structures with spatially varying electromagnetic properties via additive manufacturing (AM). To create tool paths ideal for AM processes, space-filling curves were utilized. Using fused deposition modeling (FDM), spatially varying structures were printed that produced a spatially varying relative permittivity. A wide range of varying fill fractions were printed and evaluated, demonstrating good agreement between the simulated and measured results. Furthermore, the authors verified that this design tool can be applied to practical structures by designing, printing and testing a gradient index flat lens.

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“…These application range from microwave impedance matching lenses [1] to optical resonators [2]. While numerous publications use periodic cylinders [1]- [6], additional exploration should be made into the implementation of these structures. In this work, an improved effective media equation will be formulated for periodic cylinders in a square lattice.…”

Section: Introductionmentioning

confidence: 99%

Effective properties of cylinders in a square lattice

Good

2016

2016 IEEE International Symposium on Antennas and Propagation (APSURSI)

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Periodic subwavelength structures on a boundary can enhance the transmission through the boundary. While rigorous methods are accurate for designing these structures, recent methods could benefit from an improved effective medium approximation. In this work, a modified Rayleigh mixture formula is used to approximate the effective properties of periodic cylinders in a square lattice for transverse electromagnetic plane waves. The modified Rayleigh mixture formula outperforms the Maxwell Garnett formula where the height is greater than the diameter. A comparison is shown for completeness.

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Design of graded index flat lenses with integrated antireflective properties

Cited by 11 publications

References 15 publications

Additive manufacturing of graded dielectrics

Additive manufacturing of graded dielectrics

Use of space-filling curves for additive manufacturing of three dimensionally varying graded dielectric structures using fused deposition modeling

Effective properties of cylinders in a square lattice

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