Chien Ngoc Dao

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Nowadays the design of complex real electrical, electronic or electromagnetic systems may effectively exploit the characteristics of population based global optimizers. One of the main drawbacks of the adoption of these optimizers in the design of a real system is the difficulty in the introduction, in the optimized design algorithm, of all the heuristic(More)
In the last decades several population-based heuristic search techniques have been developed for the optimization of combinatorial electromagnetic problems, all of them are modeled on the concepts of natural selection and evolution e.g. Genetic Algorithm (GA), Particle Swarm Optimization (PSO). Moreover, vast variations of original methods can be found in(More)
In this paper, a small metamaterial antenna with high efficiency is presented. The antenna is proposed for 2.4 GHz Wireless Local Area Network (WLAN) application. The metamaterial resonant antenna is designed with a mushroom structure which based on the zeroth order resonant characteristic of a composite right/left-handed transmission line (CRLH TL). The(More)
Effect of curvature of antipodal structure on Vivaldi antennas is presented in this paper. The results indicate that inner curvature has a significant impact on the return loss S11. In addition, a new estimation of lower frequency limit is shown. Based on our design, an antipodal Vivaldi antenna has been fabricated and verified its properties through(More)
The objective of this work is the design of a 32×32 element X-band reflectarray, in which the re-radiated elements have no conventional shape and enough degrees of freedom to compensate both the spatial and frequency phase variation of the re-radiated field. In particular, here we focus on a re-radiating element consisting in two concentric square(More)
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