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- Diallo, A., et al.
(författare)
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Comparison of efficiency measurement methods for small antennas
- 2005
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Ingår i: 11th International Symposium on Antenna Technology and Applied Electromagnetics, France, 15-17 June 2005. - 9780973842500 ; , s. Artno: 7852061-
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Konferensbidrag (refereegranskat)abstract
- © 2005 IEEE. The National Center for Scientific Research (CNRS) in France launched a number of specific actions (SA) in order to identify the most challenging issues to be investigated by the French research community. One of these specific actions is dedicated to antenna miniaturisation. The aim of this action is to provide a state of the art and new direction of studies in the following topics: antenna miniaturisation techniques and designs, evaluation of small antenna Q and fundamental limitation in miniaturisations, software issues: computing and benchmark, comparison of different small antennas efficiency measurement methods. This last part gathers three French university laboratories (IETR, IREENA, LEAT) and two French companies (CEA-LETI, SAGEM). Recently, three companies (TCL & ALCATEL Mobile Phones, Bluetest AB, IMST GmbH) and the Chalmers University of Technology have been interested to participate to the efficiency round robin measurements. This paper presents the work already done from January to December 2004.
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| 2. |
- Modaresi, M., et al.
(författare)
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Efficient optimization of a Yagi-Uda antenna using genetic algorithm
- 2017
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Ingår i: ANTEM 2005 - 11th International Symposium on Antenna Technology and Applied Electromagnetics, Conference Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9780973842500
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Konferensbidrag (refereegranskat)abstract
- In this paper, Yagi-Uda antenna is studied and analyzed considering a single mode cosine current distribution on all elements. A classical approach is taken for the analysis, by viewing Yagi antenna as a center-driven dipole array in which all but the actual exciter element are short-circuited at the terminals. Currents are induced in the elements via the mutual impedances, and radiation occurs as from a set of discrete sources. The mutual impedance matrix of the array is calculated using the induced EMF method and integral equations for the electric field. This analysis has led to a fast and efficient code to calculate Yagi parameters. The validity of the results has been checked with a MoM solution using NEC2 and good agreement has been observed. Then, the code is used together with a genetic algorithm in order to optimize Yagi-Uda antenna for gain maximization. A 31-element high gain Yagi with 19.2dB gain and the gain bandwidth of 8 percent is derived. Also the Pareto fronts are plotted for Yagi antennas with different number of elements which shows the trade off between the directivity and front to back lobe(F/B) ratio.
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