Structural Optimization of Metallic Patch Antenna Using Surface Impedance Method

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  • 表面インピダーンス法を用いた金属パッチアンテナの構造最適化

Abstract

This research deals with a structural optimization of a metallic patch antenna based on topology optimization. A patch antenna is a basic element of many types of antennas composed of the metal patch and the dielectric. And it is widely used for an information and communication technology. Although antenna characteristics is decided by the shape of the metal patch and dielectric, the design of such shapes is based on trial and error relied on the engineer's skills. Moreover, when an operation frequency becomes higher, its antenna characteristics are hard to be predicted and improved accurately due to the skin effect. The skin effect is a phenomenon that the electric current decreases exponentially with penetration into the metal surface in high frequency. Therefore, the mesh size of thickness direction is required to be extremely as a few thousandths of wavelength. To overcome this numerical difficulty, we propose the topology optimization method with the transition boundary condition which is able to treat the skin effect as a surface impedance. As a result, the proposed method can successfully optimize the metal shape that obtains high antenna performances.

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