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| 題 名 | 小型化天線與分集天線設計與分析=Design and Analysis of Compact Antenna and Diversity Antenna for Wireless Communication |
|---|---|
| 作 者 | 林丁丙; 林建宏; 盧子豪; | 書刊名 | 臺北科技大學學報 |
| 卷 期 | 38:1 2005.03[民94.03] |
| 頁 次 | 頁55-68 |
| 分類號 | 448.813 |
| 關鍵詞 | 小型天線; 慢波; 分集天線; 交換式波束天線; Compact antennas; Slow wave; Diversity antenna; Switched-beam antenna; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本篇論文,將探討兩個天線主題,首先探討利用慢波效果設計小型化天線,在天線的兩端其中一端饋入,另一端短路,並且天線中央為開路耦合結構使得於共振頻率電流同相,經由蝕刻適當幾何結構於天線結構體會引進慢波效果,再調整蝕刻位置會改變慢波效果,量測結果發現在天線結構上電流分佈越大的地方能夠得到較明顯的慢波效果。較明顯的慢波效果就越能得到較低的共振頻率,因此經由慢波效應的慢波特性就能縮小天線的長度,改變天線的寬和高也能降低天線長度。 本論文另提出適用於無線通訊之兩個切換輻射場型分集天線結構,第一個結構,由兩個相距λ/ 2的平面天線組成的陣列天線,經由高頻二極體的切換同相及反相饋入至天線可以得到兩個不同陣列因子輻射方向,第二個結構用兩個比偶極天線長的細金屬放在距離偶極天線λ/ 4的兩端,將兩個金屬的中間切斷並且將高頻二極體放置該處,當高頻二極體導通時,金屬呈現電感性的反射器,當不導通時呈現電容性的指向器,因此高頻二極體的切換就能切換天線輻射場型。經由提出的兩個切換輻射場型分集天線經由量測結果可以分別得到0.0318和0.0837低相關係數,利用高頻二極體的切換輻射場型的分集天線的優點是可以取代以往空間分集天線所需要的大空間及需要兩個天線饋入。 |
| 英文摘要 | In this thesis, we will discuss two topics about antennas. First, the slow wave effects will be used to design the compact antenna. The elementary structure of the compact antenna is that shorting and feeding positions are located respectively on both sides of the designed antenna. The slow wave effect will be introduced by etching applicable geometric figures on radiator of the antenna and the slow wave effect can be changed by adjusting the etching position. The measurement resuls show that the significant slow wave effect is introduced, if the etching geometric figure on the radiator of the antenna is placed at the position where has large the current density. Then more obvious slow wave effect introduces the lower relative resonant frequency. So the antenna size can be reduced significantly by the introduction of slow wave property. Also, modifying the width and height of antenna is alternative way to reduce the size of antenna. The other topic about antenna presented in this thesis will discuss two configurations of switched-beam diversity antennas for wireless communication. In the first configuration, two patch antennas separating λ/2 form a two elements antenna array. The feeding phases of each antenna element can be changed from in-phase to out-of phase by switching the appropriate pin-diodes on-off status. Then the array factor of the patch antenna array can be changed from end-fire direction to broadside direction. In the second configuration, two thin conductors are put on both sides of one dipole antenna and the both distances between each thin conductor and the dipole antenna are set as λ/4. For each thin conductor, there is a break point on the middle, then mount a pin-diode on the break point. Because the length of two thin conductors are longer than the length of the dipole antenna, two thin conductors will be equivalent as inductive reflector or capacitive reflector by switching the pin-diode to on or off status respectively. Hence, the main beams of this configuration can be switched and almost have 180° difference. For the above mentioned two configurations, the experiments show the switched-beams have low correlation coefficients 0.0318 and 0.0837 respectively. Only one feeding port is needed to configure the switched-beam antennas and the small distance between the array elements is needed to provide enough low correlation for the proposed configurations. These above mentioned antenna configurations are suitable to design the practical wireless communication systems. This is major contributions in this thesis. |
本系統中英文摘要資訊取自各篇刊載內容。