R
R. B. Greegor
Researcher at Boeing Phantom Works
Publications - 9
Citations - 582
R. B. Greegor is an academic researcher from Boeing Phantom Works. The author has contributed to research in topics: Metamaterial & X-ray optics. The author has an hindex of 9, co-authored 9 publications receiving 558 citations.
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Journal ArticleDOI
Performance of a negative index of refraction lens
C. G. Parazzoli,R. B. Greegor,J. A. Nielsen,Matthew B. Thompson,Kin Li,A.M. Vetter,Minas H. Tanielian,D. C. Vier +7 more
TL;DR: In this article, a plano-concave lens with negative index of refraction has been designed and fabricated, and the lens images the source field and reproduces the results of standard Gaussian optics.
Journal ArticleDOI
Simulation and testing of a graded negative index of refraction lens
R. B. Greegor,C. G. Parazzoli,J. A. Nielsen,Matthew B. Thompson,Minas H. Tanielian,David R. Smith +5 more
TL;DR: In this article, a gradient index (GRIN) lens using a negative index of refraction material (NIM) has been designed and tested using an electromagnetic code to design the required ring and wire unit cells.
Journal ArticleDOI
Ab initio numerical simulation of left-handed metamaterials: Comparison of calculations and experiments
Thomas Weiland,Rolf Schuhmann,R. B. Greegor,C. G. Parazzoli,A.M. Vetter,David R. Smith,D. C. Vier,Sheldon Schultz +7 more
TL;DR: Using numerical simulation techniques, the transmission and reflection coefficients, or S parameters, for left-handed metamaterials are calculated in this article, using the newly developed commercially available code MICROWAVE STUDIO, which is based on the finite integration technique with the per...
Journal ArticleDOI
Origin of dissipative losses in negative index of refraction materials
TL;DR: In this paper, the authors demonstrate that losses in negative index of refraction materials can be significantly reduced by minimizing the underlying losses of the constituent materials, which is the origin of the dissipative losses.
Journal ArticleDOI
Low frequency lumped element-based negative index metamaterial
Aycan Erentok,Richard W. Ziolkowski,J. A. Nielsen,R. B. Greegor,C. G. Parazzoli,M. H. Tanielian,Steven A. Cummer,Bogdan Ioan Popa,Thomas H. Hand,D. C. Vier,S. Schultz +10 more
TL;DR: A lumped element-based negative index metamaterial (NIM) was designed, fabricated, and tested for operation at 400MHz in the ultrahigh frequency (UHF) band as discussed by the authors.