利用具有接地連通柱屏障之帶線進行寬頻材料特性萃取方法

Abstract

本論文利用網路分析儀的TRL校準函數取得理想傳輸線散射參數，並透過解傳輸線傳輸矩陣特徵值的方式求得傳播常數，據此量測決定FR4 (環氧樹脂) 基板的介電常數及損耗。使用的傳輸線量測結構為一個具有接地連通柱屏障的帶線結構，可避免過去使用微帶線結構的輻射損耗與參數轉換中誤差的不確定性。另外並利用接地連通柱以克服平板共振對帶線產生的影響。藉由對帶線介質參數的研究，可擴展至多層板時所遇到不同板材壓合後之材質量測應用，並藉由對基板材質的了解，達到精確控制傳輸線特性阻抗之目的。文中會說明此架構設計上的考量，展示模擬與實驗結果，並與其他測量方法包括平板共振法與環形共振法所做的結果做對照比較。

This thesis aims to extract the dielectric constant and loss tangent of FR4 (epoxy resin) substrate. The network analyzer’s TRL calibration is used to measure scattering parameters of an ideal transmission line, thereby deriving the propagation constant by solving the transmission matrix eigenvalue. The transmission line is constructed as a stripline with surrounded ground via fence. It avoids radiation loss in microstrip lines of past approaches; also minimizes the uncontained error during conversion between effective and actual parameters. The ground via fence benefits in suppressing plate resonant effect. The exploration of the stripline material property can apply in characterization in multi-layer boards, and achieve accurate characteristic impedance. The design concerns are introduced and compared with plate resonance method, ring resonator method by showing simulation and experiment result.