臺灣博碩士論文加值系統

本論文以極化可重置天線為研究方向，提出兩種不同饋入方式的重置天線設計。所提出的第一個設計是首先在矩形接地面上埋入一環形槽孔，並藉由微帶線饋入來激發出線極化(TM11)模態。接著為了產生圓極化輻射，設計於環形槽孔下方(-Y軸)左右23度角各埋入一長度為四分之一波長之蜿蜒槽孔，並藉由嵌入開關二極體來達成線極化與左/右旋圓極化之間的切換。

本論提出的第二個設計為一共平面波導饋入之極化重置單極天線。設計方式是在T形饋入線與開路方環形輻射面的連接處嵌入一對開關二極體來達成線極化與左/右旋圓極化之間的切換。因為射頻訊號與直流訊號必須從同一饋入端(input port)做輸入，因此於實作時需在饋入端額外接上一Bias-Tee元件來結合這兩種訊號。

兩支提出天線皆有著低姿態、結構簡單及只需要一對開關二極體就能在三個極化之間做切換的優點。相較於第一個設計，第二個設計具備較寬的圓極化操作頻寬及天線體積較小的優點，但其偏壓結構較為複雜。兩支提出天線操作於三個極化之間皆可應用在無線區域網路(WLAN 2.4 GHz)的頻段。




關鍵字：可重置天線、極化重置、圓極化、二極體

This thesis focuses on polarization reconfigurable antenna research, and two polarization reconfigurable antennas with different feeding mechanisms are proposed. The initial design of first proposed antenna (antenna 1) is a rectangular-shaped ground plane (50 × 60 × 0.8 mm3) loaded with a ring-shape slot. By applying the microstrip line feeding technique, a linearly polarized radiation (TM11 mode) can be excited. In order to generate circularly polarization (CP) radiation, two meandered narrow slots of quarter-wavelength long are loaded symmetrically below the ring-shape slot at ± 23° along the negative Y-axis. By switching the two PIN diodes embedded into the meandered narrow slots, the proposed antenna 1 can switch between left hand circular polarization (LHCP), right hand circular polarization (RHCP), and linear polarization (LP).
The second proposed antenna (antenna 2) is a coplanar waveguide (CPW)-fed polarization reconfigurable antenna. By switching the two PIN diodes embedded between T-shape feeding line and open square-loop radiating element, the proposed antenna 2 can also switch between LHCP, RHCP, and LP. Because both the RF and DC signals must be fed from the same feeding line (input port), therefore, during the experiment, an additional Bias-Tee element must be connected to the input port for combining the two signals.
The two proposed antennas have the advantages such as low-profile, simple structure, and require only a pair of PIN diodes to switch between three polarizations. By comparing the two antennas design, even though proposed antenna 2 has exhibited wider CP bandwidth and smaller size (50 × 53 × 0.8 mm3) over proposed antenna 1, it requires a much complicated bias-network. Nonetheless, the two proposed antennas when operating within the three polarizations are able to cover the WLAN 2.4 GHz applications.























Keywords―Reconfigurable antenna, polarization reconfiguration, circular polarization, pin diode 

目 錄
誌 謝 i
摘 要 ii
Abstract iii
目 錄 v
圖目錄 vii
表目錄 xi
縮寫及符號對照表 xii
第一章 緒論 1
1.1前言 1
1.2文獻探討 2
1.3內容提要 6
第二章 微帶線饋入極化可重置槽孔天線設計 8
2.1概述 8
2.2天線結構 9
2.3設計流程及重要參數分析 12
2.4模擬表面磁流圖 23
2.5實測結果與討論 27
第三章 共平面波導饋入之極化可重置單極天線設計 37
3.1概述 37
3.2天線結構 38
3.3重要參數分析 42
3.4模擬表面電流圖 51
3.5實測結果與討論 55
第四章 總結論 66
參考文獻 70
作者簡介 75

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