臺灣博碩士論文加值系統

本論文應用有限時域差分法建構汽車天線的分析模型，以探討汽車天線之特性並進行設計，其中乃採用有限時域差分套裝模擬軟體，來建立傳統車輛使用之單極天線以及較新車款使用之隱藏式印刷天線的分析模型，並進行相關的模擬與量測。此外，並設計隱藏式車用適型天線，以應用於調頻、電視和數位音訊廣播及GSM 900/1800行動通訊系統等多頻段汽車天線需求。

This thesis applies the Finite Difference Time Domain (FDTD) method to construct the analysis models for automobile antennas in order to study the properties of those antennas and obtain better designs. An FDTD software package is employed to evaluate the performance of the traditional monopole and the modern hidden printed antennas for automobile. Some measurements are also performed to compare with the simulations. Besides, the hidden conformal automobile antennas are designed to fulfill the multi-band requirements of the automobile antennas, which include FM, TV, digital audio broadcasting (DAB) and GSM 900/1800 cellular communication systems.

第一章緒論 1
1.1研究背景1
1.2研究內容2
1.3章節概述3
第二章有限時域差分法 4
2.1前言4
2.2馬克斯威爾方程式4
2.3Yee解析方法5
2.3.1基本原理5
2.3.2FDTD解析法 6
2.4FDTD法分析技巧9
2.4.1細胞尺寸大小9
2.4.2次格子（Subgrids）分割9
2.4.3梯狀（Staircase）近似11
2.4.4時間增量 11
2.4.5波源 12
2.4.5.1入射平面波 12
2.4.5.2高斯脈衝波（Gaussian Pulse）13
2.4.5.3點波源（Point Source）14
2.4.6吸收邊界15
2.4.6.1Liao吸收邊界15
2.4.6.2PML吸收邊界16
第三章汽車天線FDTD模型17
3.1前言17
3.2頻段範圍17
3.3汽車單極天線之FDTD模型19
3.4汽車隱藏式印刷天線之FDTD模型21
第四章典型汽車天線之模擬與量測23
4.1前言23
4.2汽車單極天線之模擬結果23
4.3汽車隱藏式印刷天線之模擬與量測結果27
4.3.1模擬架構 27
4.3.2量測架構 29
4.3.3結果30
4.4不同車款印刷天線之模擬分析43
第五章車用適型天線之設計 48
5.1前言48
5.2主要車體精確模型48
5.3繞線天線（Meandered line）55
5.4L型天線60
5.5偶極L型陣列天線 62
5.5.1阻抗匹配 63
5.5.2設計與模擬結果66
5.6倒F型天線（Inverted-F）68
5.6.1倒F型天線68
5.6.2耦合F型天線（Coupled-F）71
第六章結論 74
6.1總結74
6.2具體成果74
6.3未來研究與發展方向75
參考文獻76

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