利用缺陷地面共振電路之介質量測技術

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姓名

楊安凱(An-kai Yang) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

利用缺陷地面共振電路之介質量測技術
(Dielectric Measurement Technique using Defected-ground Resonant Circuits)

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至系統瀏覽論文 ( 永不開放)

摘要(中)

本論文提出一套新的介質量測技術，以一個雙埠的缺陷地面之共振器當作感測器，主要是設計缺陷地面形狀後，把待測介質樣本置於缺陷地面電路下，使用感測器與待測物之間的地面孔徑耦合效應來達到介質量測的目的。本研究的目的有二個，其一為設計適合的共振電路與新的電路量測校準技術，其二為藉由已知介質樣品的量測，來建立經驗修正模式與反演程序。在電路設計時，透過板材選用來設計出合適的感測器，本次設計的啞鈴形缺陷地面結構感測器，經由介質量測所得透射係數的響應，其等效電路中電容量測介電係數，而電感來量磁導係數的方式，可同時得知低損耗性待測物的介電係數與磁導係數。在U形缺陷地面結構感測器的部分，經由介質量測所得透射係數的響應，使用傳輸零點位移後的頻率反演待測物之介電係數，以及等效電路中電阻來量待測物之正切損耗，可同時得知非磁性待測物的介電係數與正切損耗。本文中使用電磁模擬軟體HFSS完成缺陷地面結構感測器的設計，藉由實作量測待測物之介電係數、磁導係數與正切損耗的結果，驗證設計的正確性。

摘要(英)

In this thesis, a new dielectric measurement technique is proposed. The proposed dielectric measurement technique is mainly composed of DGS (defected ground structure). The signal is coupled to the DUT (dielectric under test) from top layer to the bottom layer through the slot aperture on the ground. There are two purposes in research. One of the two purposes is the design of the resonant circuit and the measurement calibration technique. The other of the two purposes is to measure samples, create empirical correction model and inverse algorithm. The dumbbell-shaped DGS sensor is proposed for dielectric and magnetic constants. By measuring the resonant and cut-off frequency with the DUT attached to the sensor, the dielectric and magnetic constants of the DUT can be deduced from the equivalent capacitance and inductance, respectively. The U-shaped DGS sensor is also introduced for measuring the dielectric constant and loss tangent of the DUT. The dielectric constant and loss tangent are to be obtained from the shift of the resonant frequency and the different of the magnitude of the insertion loss, respectively. The simulation results are conducted by using the full-wave simulator, HFSS. The simulated and measured results are in good agreement.

關鍵字(中)

★ 缺陷地面結構

關鍵字(英)

★ defected ground structure

論文目次

摘要 i
Abstract ii
致謝 iii
圖目錄 vi
表目錄 xi
第一章序論 1
1.1 研究動機 1
1.2 文獻回顧 3
1.3章節介紹 7
第二章研究方法 8
2.1 選擇適當的雙埠(two-port)缺陷地面共振電路 8
2.2 缺陷地面電路元件對待測參數的敏感度先期觀察 11
2.3 建立正向關係模式與量測校準技術 19
2.4 建立反演程序與經驗修正模式 22
第三章模擬與設計 24
3.1 感測區域靈敏度分析 24
3.2 量測未知物質的介電係數與磁導係數設計 27
3.2.1 板材選用 27
3.2.2 等效電路 30
3.2.3 啞鈴形缺陷地面結構感測器設計與建立正向關係模式 33
3.3 量測非磁性物質的介電係數設計 39
3.3.1 板材選用 39
3.3.2 U形缺陷地面結構感測器設計與建立正向關係模式 44
3.4 量測非磁性物質的正切損耗設計 48
3.4.1 板材選用 48
3.4.2 等效電路 55
3.4.3 U形缺陷地面結構感測器設計與建立正向關係模式 58
第四章感測器實作與量測 65
4.1 鐵弗龍與電路板的介電係數與磁導係數之量測 65
4.1.1 啞鈴形缺陷地面結構感測器實作與量測 66
4.1.2 量測校準 69
4.1.3 反演程序 73
4.1.3.1 量測鐵弗龍之反演結果 76
4.1.3.2 量測RO4003之反演結果 78
4.1.3.3 量測FR4之反演結果 80
4.1.3.4 量測RO3010之反演結果 86
4.1.3.5量測木頭之反演結果 88
4.2 量測非磁性物質的介電係數實作 90
4.2.1 U形缺陷地面結構感測器實作與量測 90
4.2.2 量測校準與經驗修正模式 93
4.2.3 反演程序 95
4.3 量測非磁性物質的正切損耗實作 106
4.3.1 U形缺陷地面結構感測器實作與量測 107
4.3.2 量測校準與經驗修正模式 110
4.3.3 反演程序 112
4.4 結論 126
第五章總結 127
參考文獻 128

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指導教授

丘增杰(Tsen-chieh Chiu)

審核日期

2011-7-13

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