Broadband monopole Yagi-Uda antenna

被引：3
|
作者：
Taguchi, Y [1 ]
Chen, Q
Sawaya, K
机构：
[1] Toyocom Engn Co Ltd, Kanagawa 2530192, Japan
[2] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan
来源：
ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS | 2002年 / 85卷 / 01期
关键词：
Yagi-Uda antenna; monopole antenna; broadband characteristics; closely located elements; aeronautical antenna;
D O I：
10.1002/ecja.1067
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 broadband Yagi-Uda antenna composed of several monopole elements is proposed. By locating the director close to the excited element and superposing the characteristics of the reflector in a lower band to those of the director in a higher band, a broadband property is obtained for both the input impedance and the unidirectional pattern. Analysis by the method of moments indicates that the Yagi-Uda antenna (type 1) composed of three monopole elements has a bandwidth of 1:1.67 for VSWR less than or equal to 2, 1:1.84 for G(d)/G(r) greater than or equal to 9 dB, and more than one octave for G(d) greater than or equal to 8 dBi, where G(d) and G(r) denote the directive gains in the front and back directions, respectively. It is also shown that the Yagi-Uda antenna (type 4) composed of five monopole elements has about one octave for a bandwidth of VSWR :: 2 and G(d) greater than or equal to 8 dBi. (C) 2001 Scripta Technica.
引用
收藏
页码：49 / 57
页数：9
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