• 作者： 李清和; 涂佳君; 許維真
• 作者服務機構： 彰化師範大學工業教育學系
• 中文摘要： 本文旨在探討耦合微帶傳輸線高階模態之洩漏特性。所使用之全波式頻域電場型積分方程（EFIE）解析法，其格林函數在頻域可表為Sommerfeld積分式之形式。而藉由基底層狀結構之表面波極點與分支點變遷路徑之判斷，可以決定傳輸線各傳播模態區內Sommerfeld積分式之適當積分路徑，以正確求得洩漏模態解。在數值計算方面，本文以全域式Chebyshev函數對電流作展開，並利用MoM法以求得耦合微帶系統高階模態之傳播常數，洩漏常數及模態電流分佈等。本研究之成果將可作為設計新型微帶裝置之實用理論依據，以及未來在此領域研究之參考。
• 英文摘要： This paper examines the dispersion and leakage characteristics of higher order modes on coupledmicrostrip lines. The full-wave, spectral domain electric field integral equation (EFIE) formulation usedin this work has a dyadic Green's function in the form of a spectral Sommerfeld integral. Based on themigration paths of the surface-wave pole(s) and the branch point(s) implicated in the integral, the appropriateintegration paths for evaluating the integrals in all three propagation regimes are determined. For numericalsolution, the integral equation is discretized via the method of moments, where entire domain Chebyshevfunctions incorporating appropriate edge factors are used for current expansions to provide convergencewith relatively few terms. Numerical results in the form of propagation constants, leakage constants, andcurrent distributions for the first three higher-order coupled modes are presented. Results from this researchwill serve as a useful reference for the design of novel coupled microstrip devices and for further studyin this area.
• 中文關鍵字： coupled microstrip lines; leakage characteristics; electirc field integral equation
• 英文關鍵字： --