The second research of the thesis is to design a double-patterns four-arm plane spiral antenna with the background of wideband circular polarization plane antenna's technology.

论文的第二个研究工作是以超宽带圆极化平面天线为研究背景，设计了一个双模四臂平面螺旋天线。

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For Bangkok, projections of damage costs double from land use patterns alone.

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The most common patterns were double tops and bottoms two peaks (or two troughs) at similar prices to each other followed by head and shoulders and inverted head and shoulders.

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It revealed that nearly three quarters of consultant general surgeons are working up to double their contracted hours because of changing work patterns and increased patient demand.

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