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International Journal of Antennas and Propagation
Volume 2017, Article ID 4903747, 13 pages
https://doi.org/10.1155/2017/4903747
Research Article

Broadband Dipole-Loop Combined Nanoantenna Fed by Two-Wire Optical Transmission Line

1Department of Electrical Engineering, Federal University of Para, Belém, PA, Brazil
2Department of Electrotechnology, Federal Institute of Education, Science and Technology of Para, Tucuruí, PA, Brazil

Correspondence should be addressed to Janilson L. de Souza; rb.apfu@noslinaj

Received 21 September 2016; Revised 31 December 2016; Accepted 9 January 2017; Published 28 February 2017

Academic Editor: Yuan Yao

Copyright © 2017 Janilson L. de Souza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a broadband nanoantenna fed by a two-wire optical transmission line (OTL). The antenna is defined by a combination of a dipole and a loop, where only the dipole element is connected to the OTL. The analysis is fulfilled by the linear method of moments with equivalent surface impedance to model the conductors. Firstly, the nanoantenna alone is investigated, where the input impedance, current distribution, reflection coefficient, fractional bandwidth, radiation efficiency, and radiation pattern are analyzed. Then, the input impedance matching of this antenna with the OTL is considered. In this case the current, near field distribution, radiation pattern, and reflection coefficient are calculated for different geometrical parameters. The results show that the loop inserted in the circuit can increase the bandwidth up to 42% and decreases the reflection coefficient in the OTL to −25 dB.