臺灣博碩士論文加值系統

在文中我們將會介紹一種利用電致動高分子材料來當作射頻切換器的探討,主要的訴求為改變天線的操作頻率，利用這種製動氣有許多的優點比方說輕、小體積、低成本、低驅動電壓。正是因為其低驅動電壓(一般為3伏特)所以特別適合利用在可攜帶裝置上。這種切換器主要是以離子金屬高分子複合材料當作致動器，由制動器的切換作為控制狀態的方法。當加以電壓時切換器是為啟動的狀態，此時原本的天線可以等效為一個被延長的天線藉以達到在低頻操作的目的。

在我們設計裝置中，原始天線的操作頻率在2.86 GHz。而當加以3伏特的驅動電壓後切換器將會啟動並將操作頻率調整到1.35 GHz。經由實驗的量測後，利用離子金屬複合材料的切換器能夠把操作頻率從2.86 GHz調整成1.37 GHz，並且在這兩個狀態其反射耗損都小於10 dB。因此將離子金屬複合材料致動器應用在可重構性天線上是非常具有潛力的。

In this work, a new concept of electroactive-polymer RF (radio frequency) switch is introduced. We used it to change operating frequency of an antenna. This actuator has attractive advantages, such as light weight, low actuating voltage, small volume and low cost. It is suitable for portable device due to have low driving voltage about 3 volts. This switch used ionic polymer metallic composite (IPMC) as actuator to control state. When the voltage is applied, the switch is in “on” state and antenna system can be considered as long one which can operate on lower frequency.

In our design, the origin antenna operates at 2.86 GHz. When applied with 3 volts, the switch was turned on and operating frequency was shifted to 1.35 GHz. We experimentally demonstrated the IPMC switch can shift operating frequency from 2.86 GHz to 1.37 GHz with return loss less than -10 dB for two states by network analysis. Therefore IPMC actuator is a potential solution for the reconfigurable antenna application.

口試委員會審定書 #
誌謝 i
中文摘要 ii
ABSTRACT iii
CONTENTS iv
LIST OF FIGURES vi
LIST OF TABLES ix
Chapter 1 Introduction 1
1.1 Electroactive polymers 1
1.2 Ionic polymer metallic composite 2
1.3 RF switch 7
Chapter 2 Antenna Design Process and Simulation Result 11
2.1 Software 11
2.2 Design process 12
2.3 Microstrip line antenna 13
2.3.1 The characteristic of microstrip antenna 14
2.3.2 Feeding method 16
2.3.3 Method of Analysis 17
2.4 Inverted-F antenna 19
2.4.1 Concept of Inverted-F antenna 20
2.4.2 Analysis of inverted-F antenna structure parameter 21
2.5 Antenna simulation 25
2.5.1 Inverted-F antenna design 26
2.5.2 Patch Antenna Design 33
Chapter 3 Fabrication 35
3.1 IPMC Fabrication 35
3.1.1 Surface treatment 37
3.1.2 First reduction 40
3.1.3 Double reduction 43
3.2 Antenna Fabrication 47
3.3 Flexible antenna 51
Chapter 4 Experimental Result 53
4.1 IPMC test experiment 53
4.1.1 Displacement Test 53
4.1.2 Loading Test 56
4.2 Device Design 58
4.2.1 IPMC-bridge 59
4.2.2 Single IPMC Switch 61
4.2.3 Double IPMC switch I 64
4.2.4 Double IPMC switch II 67
4.3 Reconfigurable Antenna applied IPMC-bridge 69
4.3.1 Device design for the gap between antenna and extension path 69
4.3.2 Simulated Results and Experimental Results of IPMC Switch 70
Chapter 5 Conclusion 76
REFERENCE 77

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