Effect of Yagi–Uda nano-antenna element shape on the directivity and radiation efficiency View Full Text


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Article Info

DATE

2019-04

AUTHORS

Fatma E. Helmy, Mohamed Hussein, Mohamed Farhat. O. Hameed, Ahmed Shaker, M. El-Adawy, S. S. A. Obayya

ABSTRACT

In this paper, different optimal designs of Yagi–Uda nano-antennas (NAs) are introduced and analyzed based on different element shapes to maximize the directivity and radiation efficiency. The studied element shapes include triangular, hexagonal, cube, square, rotated square, rectangular, ellipsoid, and elliptical cylinder shapes. The NAs parameters for each design are optimized using particle swarm optimization algorithm to achieve high directivity at a wavelength of 500 nm for wireless point-to-point applications. The designs are numerically analysed using 3-D finite difference time domain method (3-D FDTD) via Lumerical software package. To illustrate the performance of the proposed antennas, different radiation parameters such as radiation pattern, directivity, and radiation efficiency have been studied. Moreover, a tolerance of ± 5% is calculated to consider the imperfections that may appear in the fabrication process at a nanoscale. The optimized rectangular prism NA achieves the highest directivity of 24.21 with an efficiency of 50.74%. However, the optimized triangular prism NA has the highest efficiency of 73% with a directivity of 20.89. This enhancement is mainly attributed to the efficient coupling between array elements along with low side lobe level. However, a trade-off between directivity and radiation efficiency is obtained by the hexagonal prism NA with directivity of 21.9 and radiation efficiency of 69.1%. More... »

PAGES

120

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11082-019-1774-3

DOI

http://dx.doi.org/10.1007/s11082-019-1774-3

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https://app.dimensions.ai/details/publication/pub.1113199801


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