一种新颖的树状分形超宽带天线ANovelUltra-电子与信息学报.PDFVIP

第 37 卷第4 期 电 子 与 信 息 学 报 Vol.37 No.4 2015 年 4 月 Journal of Electronics Information Technology Apr. 2015 一种新颖的树状分形超宽带天线 赵小莹 臧洪明* 张功磊 卢静静 (北京航空航天大学电子信息工程学院 北京 100191) 摘 要：该文设计一种新颖的树状分形超宽带天线，该天线采用梯形结构的有限接地面。增加树状分形结构的迭代 次数和优化有限接地面的形状可以使天线获得良好的阻抗匹配，进而实现天线的超宽带性能。该天线的工作频带为 4.2~17.5 GHz(相对带宽为 122.6%)，天线的电尺寸为0.35λ×0.35λ，可应用于 C 波段、X 波段、Ku 波段和超宽 带(UWB)波段通信，具有广泛的应用前景。实测结果和仿真结果吻合，证明了该天线的有效性。 关键词：分形天线；超宽带；阻抗匹配；树状天线 中图分类号：TN823 文献标识码：A 文章编号：1009-5896(2015)04-1008-05 DOI: 10.11999/JEIT140816 A Novel Ultra-wideband Fractal Tree-shape Antenna Zhao Xiao-ying Zang Hong-ming Zhang Gong-lei Lu Jing-jing (School of Electronic Information Engineering, Beihang University, Beijing 100191, China) Abstract: An ultra-wideband fractal antenna is proposed, which has an isosceles trapezoid ground-plane. Increasing fractal iterations and optimizing ground-plane shape can achieve a better impedance matching so as to realize Ultra-WideBand (UWB) antenna performance. The presented fractal antenna offers a -10 dB return loss bandwidth in the range of 4.2 to 17.5 GHz (relative band is 122.6%) with electrical dimension of 0.35λ×0.35λ. Thus, this type of antenna is suitable for C, X, Ku and UWB band communications, which may have a wide application prospect. The measured results fit well with the simulation results, and the effectiveness is validated using the measured results. Key words: Fractal antenna; Ultra WideBand (UWB); Impedance matching; Tree-shape antenna 1 引言 列来设计一种紧凑的超宽带天线。文献[14]设计了一 种八边形超宽带分形微带贴片天线，其工作频带为 现代通信系统对天线的要求越来越严格，如紧