臺灣博碩士論文加值系統

隨著手持式電子產品的快速發展，無線功率傳輸系統的市場也日漸大增，為了使系統達到更好的功率傳輸效率，採取超穎材料是其中一個非常具有潛力的方法。
在以往超穎材料應用在無線功率傳輸系統之情況，超穎材料的週期元件通常設計為單一值的負磁導率；而本文中提到的混合式負磁導率超穎材料則能使無線功率傳輸之傳輸效率更有效的提升。在本篇論文中，我們探討了混合式負磁導率超穎材料的參數與其擺放位置的關係，經由實驗與驗證的結果顯示，混合式負磁導率超穎材料的擺放位置與其參數是相依的，透過選擇適當的負磁導率數值，能使超穎材料在不同的擺放位置情況下改善其功率傳輸效率，在增加有效傳輸距離由5公分至8公分的情況下，仍然維持其傳輸效率之32%；並且在使用了混合式超穎材料板後，效率從23.4 %明顯改善至55 %。
除了探討混合式負磁導率超穎材料對於提升無線功率傳輸的議題，我們也討論了在近場情況之下，超穎材料的參數萃取方法。不同於全波式的參數萃取方式，超穎材料在近場以及在不同位置之斜向入射的條件也納入了探討之議題。

With the drastic attention of the wireless power transfer (WPT) system for the electronic devices, applying the metamaterial mechanism into the WPT system is one of the potential methods for improving the power transfer efficiency (PTE).
Different from the conventional metamaterial slab with single negative permeability, the WPT with hybrid negative permeability (HNP) metamaterial slab has higher PTE. In this thesis, we investigate the parameters of HNP slab at different position between WPT coils. The results show that the optimal parameters of HNP slab for high PTE is dependent on the metamaterial position. After adopting an appropriate HNP slab, the higher PTE can be obtained at required arrangement of WPT coil module with the metamaterial slab, e.g, increasing the effective transfer distance from 5 cm to 8 cm, the efficiency has remained at 32 %. Furthermore, with the HNP slab, the PTE has improved from 23.4 % to 55 % in the same transferred distance of 10cm.
We not only investigate the WPT system with HNP slab, but also discuss the parameter extraction method of the metamaterial in the near-field. Instead of the full-wave parameter extraction method, the metamaterial in the condition of near-field will be considered, so will the oblique incident condition.

審定書 i
致謝 i
摘要 iii
Abstract iv
Contents v
List of Figures vii
List of Tables ix
Chapter 1 Introduction 1
1.1 The background and motivation 1
1.2 The purpose and approach for study 3
1.3 Outline of the thesis 4
Chapter 2 Metamaterial 5
2.1 Introduction of metamaterial 5
2.2 Analysis of the unit cell 7
Chapter 3 Parameter extraction method of the metamaterial 11
3.1 Normal incidence 12
3.2 Oblique incidence in WPT coil module 16
3.3 Verification of the method 21
Chapter 4 Wireless power transfer system with hybrid metamaterial slab 26
4.1 Introduction of the WPT system 26
4.2 The metamaterial slab position in WPT system 28
4.3 Adoption of the hybrid metamaterial slab 31
4.4 Measurement result of the hybrid metamaterial slab in WPT system 36
Chapter 5 Conclusion 46
Reference 47

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