标题: | 宽频缓变半宽微带泄漏波天线阵列 Broadband tapered half-width microstrip leaky-wave antenna array |
作者: | 林育杰 Lin, Yu-Chieh 林育德 Lin, Yu-De 电信工程研究所 |
关键字: | 宽频缓变半宽为带泄漏波天线;半宽微带泄漏波天线;Broadband tapered half-width microstrip leaky-wave antenna array;Half-width microstrip leaky-wave antenna |
公开日期: | 2014 |
摘要: | 本论文设计一天线阵列,应用宽频缓变半宽微带泄漏波天线作为天线阵列之单位元素。我们使用半宽的天线结构来简化传统复杂的180度相位差激发电路。半宽电路结构利用铆钉使基板上下层金属导通并作为等效电墙,其优点有: (I)简单的馈入结构,仅需使用微带线直接馈入;(II)可准确激发纯正的第一高阶模,而不须抑制零阶模;(III)相较于全宽电路有较小体积;(IV)于天线阵列设计上有较小的耦合现象。 根据微带线第一高阶泄漏波特性,本文使用一演算法来设计宽频缓变半宽微带泄漏波天线阵列。而由此宽频缓变半宽微带泄漏波天线的量测结果,可以看到设计的频宽从14 GHz到30 GHz反射损耗皆小于-10 dB,其相对频宽约2.3 : 1。 本论文后面提出一新颖演算法,来改善宽频缓变半宽微带泄漏波天线的高频辐射场型。最后根据天线量测结果,可以看到设计的频宽从14 GHz到30 GHz反射损耗皆小于-10 dB(相对频宽约2.3 : 1),且有效改善先前高频场型可能造成的分岔现象,实现一辐射场型于高频时圆滑集中的频缓变半宽微带泄漏波天线阵列。 In this thesis, we used the broadband tapered half-width microstrip leaky-wave antenna as the unit element to design a four-element antenna array. The half-width structure is used to simplify the conventional feeding structure. In the half-width structure, the perfect electric conductor (PEC) wall is realized by via holes connecting the two metallic layers on substrate. The advantages of this structure are : (I) simple feeding structure fed by microstrip line; (II) pure mode excitation and no need to suppress mode; (III) reduced size as compared to the full-width structure; and (IV) less coupling between array element. Based on the characteristics of the first higher order leaky-mode for the microstrip antenna, this thesis proposed a scheme for the empirical design of broadband tapered half-width microstrip leaky-wave antenna array. The measured bandwidth of the antenna has a return loss less than -10 dB from 14 GHz to 30 GHz, yielding a relative bandwidth of 2.3 : 1. In this thesis, we also proposed a novel design scheme for the empirical design of broadband tapered half-width microstrip leaky-wave antenna array to improve the radiation patterns in higher frequency. The measured bandwidth of the antenna has a return loss less than -10 dB from 14 GHz to 30 GHz(relative bandwidth of 2.3 : 1), and the main beam bifurcation in the previous design was alleviated. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT070160314 http://hdl.handle.net/11536/75897 |
显示于类别: | Thesis |