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| 研究生： |
賴文正 Wen-Cheng Lai |
|---|---|
| 論文名稱： |
可變輻射場型與多極化方向天線設計之研究 Antenna Design Study on Reconfigurable Radiation Pattern and Polarization Diversity |
| 指導教授： |
徐敬文
C.-W. Hsue |
| 口試委員: |
黃進芳
J.-F. Huang 張勝良 S.-L. Chang 王蒼容 C.-L Wang 馮武雄 W.-S Feng 張道治 D.-C Chang 陳一鋒 I.-F Chang |
| 學位類別： |
博士 Doctor |
| 系所名稱： |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
| 論文出版年： | 2014 |
| 畢業學年度： | 102 |
| 語文別： | 中文 |
| 論文頁數： | 97 |
| 中文關鍵詞： | 平面天線 、鐵磁性材料 、延伸距離 、貼片天線 、二極體 、重置 、極化 、多樣 |
| 外文關鍵詞： | planar monopole, magnetodielectric material, range extension, patch antenna, diode, reconfigurable, polarization, diversity method |
| 相關次數： | 點閱：320 下載：9 |
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本論文提出可以改變天線「輻射場型」與「極化方向」的設計方法。首先，天線「輻射場型」的改變可利用高導磁係數的鐵磁性材料設計於天線，以材料本身的特性、形狀來改變原本天線的「輻射場型」。先以簡單的單極天線為研究對象，採取平面無孔洞、單孔洞及多孔洞之鐵磁性材料，探討其對天線之影響，發展出天線之一側放置鐵磁性材料，合併成為「磁性天線」；對於天線之一側放置有孔洞之鐵磁性材料者，合併成為「孔洞磁性天線」。由研究結果得知，對於中心頻率操作在UHF頻段(860-960MHz)之無線識別系統(RFID)，「磁性天線」加入適當的鐵磁性材料，的確可以增加reader天線2.26dBi的增益值，以及reader 和 tag之間的讀取距離，約可增加70%的傳輸距離。
其次，天線「極化方向」的改變是利用二極體開關來設計，使天線可以調整其極化方向。以貼片天線為主體，加入環形槽孔，在槽孔上以間隔30°的方式擺放二極體。藉由相鄰的六顆二極體導通，調整電場極化方向角度分別為0°、30°、60°、90°、120°、150°等六種，來達到線性極化波的極化方向切換，使得單一天線具有接收不同極化方向訊號的效果。由結果發現，雖與模擬數據有所差異，但整體趨勢還是相當吻合，也證明了設計的正確性。
兩種改變天線特性的方式於模擬與實測結果均顯示，其架構簡單、調整容易，在實用性上，均能依不同狀況調整使其達到最佳的收訊效果，亦為本研究主要之目的。
In this thesis, we propose the two design method of antenna, one is reconfigurable of radiation pattern and another one is reconfigurable of polarization. First, the radiation pattern reconfigurability is realized straightforwardly with an employment of a detached magnetodielectric slab placed in the vicinity of the antenna structure. We determine the monopole antenna which is simple to research. Then, discuss on using magnetodielectric slab placed in the vicinity of the antenna structure, like non-porous, single hole, porous slab. Therefore, we define ‘magnetic antenna”. The antenna structure with single hole or porous slab, we define ‘porous magnetic antenna”. As above results, through the use of a magnetodielectric material on the back of the RFID reader antenna, the antenna gain is increased 2.26dBi. This enhancement has increased the operational range behind the the antenna by nearly 70% for far-zone reading.
Secondly, we use diode to design reconfigurable of polarization, which able to adjust antenna. We use a circular patch antenna with a ring slot on it. On the ring slot, diode switches are placed at 30° interval. We propose a design of polarization diversity antenna which is able to generate six Lps st a 30° interval (0°, 30°, 60°, 90°, 120°, 150°) with the same antenna characteristics due to symmetry in geometry of the antenna. Measured results are in good agreement with the simulated, proving the correctness of our design.
Two reconfigurable of antenna methods shown in simulated and measured results, the demonstrated antennas own a low-cost, adjust-easy are expected to find application in noise or interference suppression for the mobile devices in different environment. It’s the purpose on this research.
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