To obtain a constant gradient magnetic field outside unilateral nuclear magnetic resonance (NMR), optimal design method based on finite element method (FEM) and topology optimization is proposed.

为了在单边核磁共振仪器外产生梯度恒定的磁场，提出利用基于拓扑优化和有限元法的优化设计方法。

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On the basis of making the achievement previously, it was suggested and perfected what the types of the plane unilateral and bi-directional and spatial mapping infinite element.

在早先取得成果的基础上，提出并完善了平面单向、双向映射无限元及空间映射无限单元的类型。

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This paper presents a kind of two-element array, discusses its possibility of being used for array miniaturization and analyses the main factors for influencing its unilateral directivity.

本文介绍了一种单向性二元阵，探讨了其在基阵小型化中应用的可能性，分析了影响这种阵单指向性的主要因素。

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