臺灣博碩士論文加值系統

本論文將針對串聯饋入式平面天線之特性進行分析與探討，分別針對通訊系統的需求，分成三大架構：圓極化天線設計、天線陣列之互耦效應對通訊系統所造成之影響以及矩形微帶天線應用於毫米波頻段。

圓極化天線之設計，主要針對行進波型式之天線，採用單饋入網路及利用微帶線的電流特性和不連續特性來產生輻射，藉此降低圓極化天線之饋入網路的複雜性，再利用寬頻的負載天線產生寬頻圓極化之效果，有效改善一般共振式圓極化天線的窄頻特性。在有限頻譜中，為了增加通訊品質而採用天線陣列的方式提高傳輸性能，其應用於MIMO系統架構中時，所產生之互耦效應，對天線之間的信號相關性及通道容量之影響也將有完整介紹。為因應不斷提高通訊品質所需之頻寬，設計矩形微帶天線於毫米波的頻段範圍，相對之下頻寬能夠有所助益，其結構尺寸縮小，更能有效整合到MMIC的製程中，符合新一代通訊系統之需求。

In this thesis, the characteristics of planar antennas in series-fed configuration have been investigated theoretically and experimentally. Due to the demand for modern communication system, the circularly polarized antenna, the mutual coupling effect in antenna array and the millimeter-wave microstrip patch antenna are discussed.

The circularly polarized antenna using the microstrip-line feeding network with the discontinuities to produce the traveling-wave radiation. This configuration reduces the complexity of feed network and achieves a broadband circular polarization by using a match load at the end. To enhance communication capacity of the antenna array system, signal correlation and channel capacity are studied while the mutual coupling is presented in the array system. Moreover, the series-fed microstrip patch antenna in millimeter wave regime is also proposed, the broad bandwidth is achieved and the planar and compact construction can be easily combined to MMIC.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 v
第一章 序論 1
1.1 概述 1
1.2 研究動機 2
1.3 內容提要 2
第二章 串聯饋入式圓極化天線 4
2.1 簡介 4
2.2 行進波天線理論分析 5
2.3 天線設計與分析 6
2.3.1 曲柄狀天線設計與模擬 6
2.3.2 負載天線設計與模擬 7
2.4 實驗結果 8
第三章 天線陣列之互耦效應 22
3.1 簡介 22
3.2 互耦效應 22
3.2.1 串聯饋入式圓極化天線陣列 24
3.3 多天線系統 25
3.3.1 相關性 25
3.3.2 通道模型 26
3.3.3 自由空間損失 27
3.3.4 通道容量 28
第四章 毫米波微帶天線 38
4.1 簡介 38
4.2 微帶天線設計與分析 38
4.2.1 傳輸線模態分析 39
4.2.2 空腔模態分析 39
4.3 微帶天線設計與模擬 41
4.4 天線陣列 41
第五章 結論 56
參考文獻 57

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