Horn antennas can result in good impedance matching between the waveguide and free space due to the gradual increase in the aperture size. In this paper, a novel plasmonic sectoral horn nanoantenna based on using lens in the aperture is proposed. It is investigated that More
Horn antennas can result in good impedance matching between the waveguide and free space due to the gradual increase in the aperture size. In this paper, a novel plasmonic sectoral horn nanoantenna based on using lens in the aperture is proposed. It is investigated that in addition to improvement of the directivity, the reflection coefficient is also reduced using the proper lens structure. The maximum directivity improvement is about 2 dBi compared to the structure without lens. Also, it is shown that the radiation pattern can be controlled by utilizing electro-optical material as the lens
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We consider the following similarity problem concerning the Fréchet distance. A directed path π is given as input and a horizontal segment Q is defined at query time by the user. Our goal is to preprocess and save the directed path π into a data structure such that base More
We consider the following similarity problem concerning the Fréchet distance. A directed path π is given as input and a horizontal segment Q is defined at query time by the user. Our goal is to preprocess and save the directed path π into a data structure such that based on the information saved in the data structure, one sub-path of the directed path can be reported which Fréchet distance between the sub-path and the horizontal query segment Q is minimum between all possible sub-paths. To the best of our knowledge, no theoretical results have been reported for this problem. In this paper, the first heuristic algorithm is proposed. We only experimentally show the quality of the algorithm in several datasets due to no existing algorithm.
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Cognitive radio is a promising technology which aims to achieve better frequency spectrum utilization. On the other hand, wireless energy harvesting can provide extra energy requirement at the nodes. Two scenarios in a two-way network are assumed where in the first scen More
Cognitive radio is a promising technology which aims to achieve better frequency spectrum utilization. On the other hand, wireless energy harvesting can provide extra energy requirement at the nodes. Two scenarios in a two-way network are assumed where in the first scenario, relay harvests its required energy from end-sources of secondary network in presence of cognitive radio network and in the second scenario, both end-sources harvest energy from relay in secondary network. Both the Nakagami-m fading caused by signal propagation and the interference at relay caused by primary users in a cognitive radio network are considered. Closed-form expressions for outage probability and throughput of bidirectional cognitive radio amplify-and-forward relaying network using energy harvesting and wireless power transfer techniques over independent and non-identically distributed (i.n.i.d.) Nakagami-m fading channels are proposed. The analytical derivations are validated employing Monte Carlo simulations, where it is demonstrated that the first scenario always outperforms the second one, while both scenarios perform better than no energy harvesting case.
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