far-field diffraction
... far-field bubble period 远场气泡周期 far-field diffraction 远场绕射 far-field particle velocity 远场质点速度 ...
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采用口径场绕射积分求取了天线的近场及远场方向图，绘制了波束宽度、方向性和最大副瓣电平三个关键参数随场点距离的关系曲线。
Three key parameters, namely beamwidth, directivity and maximum sidelobe level, are drawn versus the distance between field points and the center of aperture.
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