Design Consideration of Polarization-Transformation Filters Using a Genetic Algorithm(Special Issue on Microwave and Millimeter Wave Technology)

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概要

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• This paper presents the design consideration of a polarization-transformation transmission filter, which is composed of a multilayered chiral slab. The optimal material parameters and thickness of each layer of the slab can be determined by using a genetic algorithm (GA). Substituting the constitutive relations for a chiral medium into Maxwell's equations, the electromagnetic field in the medium is obtained. A chain-matrix formulation is used to derive the relationship between the components of the incident, the reflected, and the transmitted electric fields. The cross- and co-polarized powers carried by the transmitted and reflected waves are represented in terms of their electric field components. The procedure proposed for the design of a polarization-transformation filter is divided into two stages. An ordinary filter without polarization-transformation and a polarization-transformation filter for the transmitted wave are designed with a multilayered non-chiral slab and a multilayered chiral slab at the first and the second stages, respectively. According to the specifications of the filters, two functionals are defined with the transmitted and reflected powers. Thus the optimal design of a polarization-transformation filter with the multilayered chiral slab is reduced to an optimization problem where the material parameters and thickness of each chiral layer are found by maximizing the functionals. Applying the GA to the maximization of the functionals, one can obtain the optimal material parameters and thicknesses of the multilayered chiral slab. Numerical results are presented to confirm the effectiveness of the two-stage design procedure. For three types of multilayered chiral slabs, optimal values of refractive indices, thicknesses, and chiral admittances are obtained. It is seen from the numerical results that the proposed procedure is very effective in the optimal design of polarization-transformation filters for the transmitted wave.

• 社団法人電子情報通信学会の論文
• 2003-08-01

著者

• KUSUNOKI Atsushi

  Faculty of Engineering, Oita University

• Kusunoki Atsushi

  Faculty Of Engineering Oita University

• Tanaka Mitsuru

  Faculty Of Agriculture Graduate School Kyushu University

• Tanaka Mitsuru

  Faculty Of Engineering Oita University

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• Determination of Antihypertensive Small Peptides, Val-Tyr and Ile-Val-Tyr, by Fluorometric High-Performance Liquid Chromatography Combined with a Double Heart-Cut Column-Switching Technique
• Design Consideration of Polarization-Transformation Filters Using a Genetic Algorithm(Special Issue on Microwave and Millimeter Wave Technology)
• Scattering Characteristics of Stratified Chiral Slab (Special Issue on the 1992 Symposium on Electromagnetic Theory)

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