标题: 宽频缓变半宽缩短化微带泄漏波天线阵列与调变式周期性铆钉结构控制传播特性之半宽微带泄漏波天线阵列
Broadband Half-Width Microstrip Leaky-Wave Antenna Array with Shortened Length and Half-Width Microstrip Leaky-Wave Antenna Arrays with Varying-Periodicity Vias to Control the Propagation Characteristics
作者: 周德昕
林育德
Chou, Te-Hsin
Lin, Yu-De
电信工程研究所
关键字: 天线;泄漏波天线;天线阵列;传播常数;周期性铆钉;Antenna;Leaky Wave Antenna;Antenna Array;Propagation Constant;Varying-Periodicity Vias
公开日期: 2015
摘要: 本论文设计之天线阵列应用宽频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)简易的馈入结构,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,本文使用数值设计流程与全波仿真模拟软体来设计天线。而由此天线的量测结果,可以看到设计后的缩短长度尺寸微带泄漏波天线阵列频宽由6.5 GHz到30 GHz反射损耗皆小于-10 dB,其相对频宽约4.29 : 1,而具有周期性铆钉结构控制传播特性之微带泄漏波天线阵列频宽由11 GHz到13 GHz,且实现了降低旁波瓣与光栅波瓣之增益,以及主波束高增益集中之效果。
本论文后面提出一新颖的耦合模态结构来优化周期性铆钉结构控制传播特性之微带泄漏波天线阵列的频宽。最后根据天线的量测结果,我们改良了原有天线的频宽,其成功增加了2 GHz左右的操作频带。
In this thesis, we use the broadband tapered half-width microstrip leaky-wave antenna to be the unit element and design an eight element antenna array. We use the half-width structure to simplify the conventional feeding structure, which is 180°out of phase. In the half-width structure, the PEC wall is constructed by via holes conducting 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 ;
(IV) less interaction in an array design.
Based on the characteristics of the first higher order leaky-mode for the microstrip antenna, this thesis proposes a scheme for the empirical design of half-width microstrip leaky-wave antenna arrays . The measured bandwidth of the antenna has a return loss less than -10 dB from 6.5 GHz to 30 GHz, yielding a relative band width of 4.29 : 1.
In this thesis, we also propose a novel coupled-mode scheme for the empirical design of half-width microstrip leaky-wave antenna arrays with varying periodic vias to control the propagation characteristics optimization of bandwidth. Based on the measurement results, we realize a bandwidth of 2 GHz in previously antenna array.
URI: http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070260294
http://hdl.handle.net/11536/142350
显示于类别:Thesis