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阵元尺寸对平面型HIFU相控阵轴线声压聚焦增益影响
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作者 高发伟 郭甲 +1 位作者 王祥达 张晓红 《湖南理工学院学报(自然科学版)》 CAS 2022年第3期29-34,共6页
基于Rayleigh积分推导平面型相控阵远场轴线声压聚焦增益公式,并分析阵元尺寸对轴线声压聚焦增益影响.仿真结果表明,在距离相控阵较远时,不论发射频率如何变化,所有轴线声压聚焦增益均单调递减,且阵元尺寸增大对于轴线声压聚焦增益有增... 基于Rayleigh积分推导平面型相控阵远场轴线声压聚焦增益公式,并分析阵元尺寸对轴线声压聚焦增益影响.仿真结果表明,在距离相控阵较远时,不论发射频率如何变化,所有轴线声压聚焦增益均单调递减,且阵元尺寸增大对于轴线声压聚焦增益有增强效果.在距离相控阵较近时,轴线声压聚焦增益会出现极大值,且阵元尺寸越大以及发射频率越高,极大值越容易出现,极大值左侧的轴线声压聚焦增益会随着阵元尺寸增大而出现先增大后减小现象.较小阵元尺寸会导致平面型相控阵的轴线声压聚焦增益均不会很高,实际中难以满足HIFU治疗需求. 展开更多
关键词 HIFU 平面型相控 阵元尺寸 轴线声压聚焦增益
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High Isolation and Low Correlation Small Size Multi-Antenna for MIMO Mobile Terminals
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作者 Song Zhaohui Ding Zhiyong 《China Communications》 SCIE CSCD 2012年第5期100-107,共8页
A new method of forming a four-port multi-antenna by a two-unit patch antenna array is proposed to design a high isolation low correlation stroll size multi-antenna. Dual polarization is real-ized by the method of fee... A new method of forming a four-port multi-antenna by a two-unit patch antenna array is proposed to design a high isolation low correlation stroll size multi-antenna. Dual polarization is real-ized by the method of feeding in two ports. Defec-ted Ground Structure (DGS) is used to eliminate the coupling between the two antenna units. The test results show that the isolation between two ports reaches around 20dB, and that the antenna correlation coefficients is less than 0. 5, which meets the requirements of future mobile communi-cation systems and provides a solution to multi-antenna of MIMO terminals. 展开更多
关键词 MIMO mobile terminal antenna corre-lation DIVERSITY
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