平面螺旋宽带天线具有频带较宽、体积较小、圆极化性能较好等特点，应用范围很广。
Planar Archimedean antenna has some advantages as wideband, small volume and good performance in circularly polarizing, so it has broad appliance prosperity.
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。
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。
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.
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