Vector Evaluated GA-ICT for Novel Optimum Design Method of Arbitrarily Arranged Wire Grid Model Antenna and Application of GA-ICT to Sector-Antenna Downsizing Problem
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概要
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This paper proposes the Vector Evaluated GA-ICT(VEGA-ICT), a novel design method that employs the Genetic Algorithm(GA)to obtain the optimum antenna design. GA-ICT incorporates an arbitrary wire-grid model antenna to derive the optimum solution without any basic structure or limitation on the number of elements by merely optimizing an objective function. GA-ICT comprises the GA and an analysis method, the Improved Circuit Theory(ICT), with the following characteristics. (1)To achieve optimization of an arbitrary wire-grid model antenna without a basic antenna structure, the unknowns of the ICT are directly assigned to variables of the GA in the GA-ICT.(2)To achieve a variable number of elements, duplicate elements generated by using the same feasible are deleted in the ICT.(3)To satisfy all complex design conditions, the GA-ICT generates an objective function using a weighting function generated based on electrical characteristics, antenna configuration, and size.(4)To overcome the difficulty of convergence caused by the nonlinearity of each term in the objective function, GA-ICT adopts a vector evaluation method. In this paper, the novel GA-ICT method is applied to downsize sector antennas. The calculation region in GA-ICT is reduced by adopting cylindrical coordinates and a periodic imaging structure. The GA-ICT achieves a 30% reduction in size compared to the previously reported small sector antenna, MS-MPYA, while retaining almost the same characteristics.
- 社団法人電子情報通信学会の論文
- 2001-11-01
著者
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Maruyama T
Ntt Network Innovation Lab. Yokosuka‐shi Jpn
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Hori Toshikazu
Wireless Systems Innovation Laboratory Ntt Network Innovation Laboratories Nippon Telegraph And Tele
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MARUYAMA Tamami
Wireless Systems Innovation Laboratory, NTT Network Innovation Laboratories, Nippon Telegraph and Te