臺灣博碩士論文加值系統

為了了解不同介質的電磁特性，我們將用軟體模擬簡單的介質，將模擬所得之S參數與所推導的電磁公式做計算來求得模擬介質之介電常數、損耗因數。
一般在天線量測系統中的發射天線皆由許多窄頻天線所組成，如需量測寬頻天線時，則要使用到許多不同頻段之窄頻天線。對於使用不同發射天線的天線測試場而言，有以下缺點:購置許多不同種類之發射天線而增加成本、耗費許多操作時間在換裝不同類型之發射天線上及對天線場型量測結果之不確定度，因此設計一具有低指向性寬頻之號角天線結合寬頻阻抗匹配器，並將應用於室內近場量測系統之發射端，此天線之工作頻寬為1GHz~18GHz，除了具有超寬頻的特性外，亦具備對稱之天線場型、低指向性等優異特性。
同時設計一能在水中接收之超寬頻領結天線。此天線在水中之工作頻寬為3GHz~12.5GHz。在應用上由網路分析儀與脈衝時域量測系統量測此天線在空氣中與在水中之S參數與場型等，以探討電波傳播的特性。

For recognizing the EM characteristics of mediums, the simulation is developed in this thesis. Using the simulated results of S parameters, the dielectric constant and loss tangent of medium can be calculated by EM formulas.
Generally, the transmitting antennas in test ranges are consist of various narrow band antennas for wide band applications. The drawback are higher cost for purchasing the probe antennas, time consuming for changing and uncertainty of the antenna patterns; therefore, a novel transmitter antenna constructed with low directivity wideband horn and wideband balun will be developed in this thesis and applied for the Near-field antenna measurement system. The operating frequency from 1 GHz to 18 GHz, low directivity and symmetry antenna pattern are achieved.
Meanwhile, a ultra-wideband bow-tie receiving antenna is designed and applied in the water from 3GHz to 12.5 GHz. Both S-parameters and radiation patterns are measured by the network analyzer and impulse time domain antenna measurement system respectively. The EM wave propagation for various media is analyzed

封面內頁
簽名頁
授權書．．．．．．．．．．．．．．．．．．．．．．．．．iii
中文摘要．．．．．．．．．．．．．．．．．．．．．．．．iv
英文摘要．．．．．．．．．．．．．．．．．．．．．．．．v
誌謝．．．．．．．．．．．．．．．．．．．．．．．．．．vi
目錄．．．．．．．．．．．．．．．．．．．．．．．．．．vii
圖目錄．．．．．．．．．．．．．．．．．．．．．．．．．ix
表目錄．．．．．．．．．．．．．．．．．．．．．．．．．xiv

第一章 緒論
1.1 簡介．．．．．．．．．．．．．．．．．．．． 1
1.2 研究動機．．．．．．．．．．．．．．．．．． 1
1.3 論文架構．．．．．．．．．．．．．．．．．． 2
第二章 基本原理
2.1 介質之電磁特性．．．．．．．．．．．．．．． 3
2.2 簡單物質之電磁特性模擬．．．．．．．．．．． 5
2.3 電磁波醫療檢測．．．．．．．．．．．．．．． 9
第三章 超寬頻橫向電磁波號角天線量測系統
3.1 超寬頻天線．．．．．．．．．．．．．．．．．20
3.2 超寬頻橫向電磁波號角天線．．．．．．．．．．20
3.3 超寬頻橫向電磁波號角天線設計．．．．．．．．21
3.3.1 寬頻阻抗匹配器．．．．．．．．．．．． 21
3.3.2 橫向電磁波號角天線．．．．．．．．．． 23
3.4 超寬頻橫向電磁波號角天線測試．．．．．．．．24
3.5 超寬頻近場量測系統．．．．．．．．．．．．．25
第四章 寬頻領結天線
4.1 介質量測天線．．．．．．．．．．．．．．．．55
4.2 液體量測天線．．．．．．．．．．．．．．．．56
4.3 測體量測領結天線設計．．．．．．．．．．．．56
第五章 場型量測
5.1 頻域網路分析儀量測．．．．．．．．．．．．．66
5.2 時域網路分析儀量測．．．．．．．．．．．．．67
5.3 量測結果．．．．．．．．．．．．．．．．．．69
第六章 結論．．．．．．．．．．．．．．．．．．．．．．83
參考文獻．．．．．．．．．．．．．．．．．．．．．．．．84

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