Some Array Applications of the Curl Antenna
Some Array Applications of the Curl Antenna
复制标题
卷曲天线的一些阵列应用
DOI：
10.1080/02726340050082128
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发表时间：
2000
期刊：
影响因子：
0.8
通讯作者：
L. Shafai
中科院分区：
文献类型：
--
作者：
L. Shafai
卷曲天线是一个单圈水平螺旋线，由类似于抛物面的馈源馈电。为了提高其辐射场和轴比，通常对螺旋和螺旋线的尺寸进行优化。研究表明，在辐射区的某些区域，轴比可以得到优化。此外，辐射图案可以在一侧上倾斜离开其轴，这可以用于改善小阵列中的阵列图案扫描。该概念用于设计移动的卫星通信的小型平面阵列。在离轴覆盖区的轴比和阵列增益的增强，初步研究了数值。阵列放置在无限大的地平面上。实验原型，但是，实施和测试在一个有限的4.5K-3 - 4.5K接地平面。轴比性能似乎仍然令人满意，但阵列增益略有下降，由于背辐射。卷曲天线配置，在双倒置的形式，也用于广角轴比的改善。它提供了一个紧凑的高增益天线，在大部分半球形区域具有出色的圆极化。
The curl antenna is a single-turn horizontal spiral fed by a monopole-like feed. The spiral and monopole dimensions are usually optimized to improve its radiation field and axial ratio for broadside radiation. It is shown in this study that the axial ratio can be optimized in certain regions of the radiation zone. In addition, the radiation pattern can be tilted off its axis on one side, which may be used to improve the array pattern scanning in small arrays. The concept is used for design of small planar arrays for mobile satellite communications. The axial ratio and array gain enhancements, in an off-axis coverage zone, are initially investigated numerically. The array is placed over an infinite ground plane. Experimental prototypes are, however, implemented and tested over a finite 4.5k 3 4.5k ground plane. The axial ratio performance appears to remain satisfactory, but the array gain reduces slightly, due to the back radiation. The curl antenna configuration, in dual inverted form, is also used for wide-angle axial ratio improvement. It provides a compact high-gain antenna with excellent circular polarization over most of the hemispherical region.