A two-arm Archimedean spiral antenna with bent ends

M. Tanabe, M. Matsumoto, Y. Masuda
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引用次数: 4

Abstract

A two-arm Archimedean spiral antenna with bent ends is analyzed. The arms are bent at the end and connected to the neighboring arm. The outer circumference of the spiral antenna is chosen to be one-wavelength at the lower operating frequency. The analysis is performed using the method of moment. First, we analyze current distribution on the spiral antenna. It is shown that the current smoothly flows from the arm end to the neighboring arm through the bent end. Therefore, the reflected current on the end of the spiral arms reduces at lower operating frequencies. Subsequently, radiation characteristics are analyzed. Good axial ratio is obtained at lower frequency bands. The antenna gain also improves at lower frequency bands. It is concluded that simply bending and connecting the ends of the arms greatly contributes to the size reduction of the spiral antenna.
一种末端弯曲的双臂阿基米德螺旋天线
对末端弯曲的双臂阿基米德螺旋天线进行了分析。手臂的末端是弯曲的,并与相邻的手臂相连。在较低的工作频率下,选择螺旋天线的外周长为一个波长。采用矩量法进行分析。首先,分析了螺旋天线上的电流分布。结果表明,电流通过弯曲端从手臂端平滑地流向相邻的手臂。因此,在较低的工作频率下,螺旋臂末端的反射电流减小。随后,分析了辐射特性。在较低频段获得了良好的轴比。在较低频段,天线增益也有所提高。结果表明,对臂端进行简单的弯曲和连接,对减小螺旋天线的尺寸有很大的帮助。
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