- 學位論文
波束切換之寬頻循序旋轉饋入槽孔天線陣列
Broadband, Sequentially-Rotated Slot Array with Beam-Switching Capability
摘要
圓形極化波因具有可抑制多重路徑反射的特性而廣泛地被運用在無線通訊系統中。波束切換陣列則可藉由改變天線單元間的饋入相位差來切換輻射場型，達到良好的傳輸品質及容量。基於寬頻操作的考量，本論文選擇以圓極化之圓形槽孔天線來組成陣列。文中首先針對該槽孔天線的物理機制與工作模態做了探討與分析。為了切合實際應用，吾人將多個槽孔天線組合成一維及二維之天線陣列，以提升天線增益，並利用循序旋轉饋入法設計該二維天線陣列的饋入網路，以增加其圓極化頻寬。 接著，吾人以延遲傳輸線饋入，以驗證前述天線陣列之波束切換特性。由於二維陣列中的天線單元均經過不同角度的旋轉，因此吾人在設計具波束切換功能之二維天線陣列前，先提出一簡單方法預測該陣列之輻射場型，並針對各個天線單元的饋入相位作了些微的調整，以確保主波束方向符合設計目標。在分別驗證了一維與二維天線陣列的波束控制特性後，本論文並提出以相移器取代延遲傳輸線來實現波束切換功能，得到寬頻圓極化且具波束切換功能之一維及二維槽孔天線陣列，並分別以實作驗證。
並列摘要
For wideband operation, a circularly-polarized circular slot antenna fed by a microstrip line has been chosen in this thesis to form an array. The physical mechanism and the analysis of the operating mode of the antenna are discussed first. The circular slot antenna is then employed to form a linear array and a planar array to increase the antenna gains. In addition, to enhance the axial-ratio bandwidth of the planar antenna array, the sequential rotation technique is applied in the design of the feeding network for the array. The aforementioned linear and planar arrays are also designed to have beam-switching capability. In designing the switched-beam planar array, we proposed a simple method to predict the radiation pattern of the array. The feeding phases for those array elements are thus modified to produce a main beam in the specified direction. After verifying the beam-switching characteristics of the linear and the planar arrays, phase shifters are exploited to replace the delayed microstrip lines to attain the beam-switching capability. As a result, broadband, circular-polarized switched-beam slot antenna arrays, both linear and planar arrays, are proposed, implemented, and tested.
參考文獻
延伸閱讀
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