Audio directional loudspeaker is a novel loudspeaker which can generate an audio signal with high directivity by utilizing the parametric array principle.

声频定向扬声器是利用参量阵原理，产生高指向性声频信号的新一代扬声器。

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The directivity of curvilinear dipole is analysed by the basic principle of antenna array, the relationship between the directivity and the length of curvilinear dipoles is obtained.

本文利用天线阵基本原理近似分析了曲线振子的方向性系数，得到了方向性系数随曲线振子长度的变化关系，为曲线振子天线的进一步研究及设计提供参考。

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This paper proposed a practical model for a high-directivity weak-coupling coaxial microwave coupler, based on the principle of coaxial directional coupler and a precise theoretical analyzing process.

从同轴定向耦合器的基本原理出发，提出了一种比较实用的高方向性弱耦合的同轴定向耦合器的模型。

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