A curved spiral antenna above a conducting cylinder

被引:16
作者
Nakano, H [1 ]
Nakayama, K [1 ]
机构
[1] Hosei Univ, Coll Engn, Tokyo 1848584, Japan
关键词
measurements; moment-method solutions; spiral antenna;
D O I
10.1109/8.752973
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A curved spiral antenna above a finite hollow conducting cylinder is analyzed using the method of moments. The effects of cylinder length 2H and cylinder radius r(cy) on the radiation characteristics of the spiral are evaluated. As 2H increases, the cross-polarization component of the radiation field in the broadside direction decreases to a constant value (approximately -18 dB), When 2H is greater than one wavelength (lambda(0)), the input impedance of the spiral above a cylinder of radius r(cy) = 0.25 lambda(0) is almost constant (250-j20 Ohm) with a gain of approximately 7 dB. The spiral above a cylinder of (2H, r(cy)) = (2.7 lambda(0), 0.25 lambda(0)) shows a 3-dB axial ratio bandwidth of approximately 23%, which is wider than a flat spiral antenna above a flat ground plane of infinite extent.
引用
收藏
页码:3 / 8
页数:6
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