臺灣博碩士論文加值系統

本論文採用鋁合金為原料，設計製造了耐用的圓極化天線。該天線具有耐高溫、熱傳導性好、散熱性能佳等性能。這些特徵可以提高天線在高功率長時間持續運行的性能。市售上圓極化天線都是使用介質片去改變相位，材質常選用鐵氟龍、環氧樹脂、合成塑膠等，在高功率或高敏感度傳送或接收微波訊號而言，長時間使用狀態下，更可能進一步影響系統的穩定性且容易損毀，導致於在無線通訊的系統建構上有一大阻礙。
本論文研究經由三維電磁場模擬軟體輔助模擬，使用的分析軟體為ANSYS公司發展的高頻結構分析軟體（High Frequency Structure Simulator, HFSS）使用ANSYS公司開發的3D HFSS軟體來模擬了圓極化天線的製造相關參數。隨後, 製造了兩具圓極化天線，再使用網路分析儀及通過TAF認證之遠場天線測試設備量測電性性能。經由設備測量結果顯示，兩具圓極化天線電性性能幾乎相似，證明了此兩具天線重現性非常好。
本研究所製作圓極化天線具備有良好的電性性能，取樣頻率 (Frequency) 頻寬 22.5~25 GHz、反射損失（Return loss）≦-15 dB，而且增益（Gain）≧20 dB、軸長比（Axial Ratio）≦1.3 dB。







關鍵字:圓極化天線、介質片、遠場

In this thesis, a durable circularly polarized antenna (CPA) horn was designed and fabricated using aluminum alloy as the raw material. The fabricated unit possessed the quality of high temperature resistance, good thermal conductivity and excellent heat dissipation capability. These features can improve antenna performance operating at high power over an extended duration. The current fabricated unit is a vast improvement over the more common CPA constructed out of Teflon, synthetic plastic and epoxy resin, which can suffer irreparable damage under prolonged high power operation. This shortcoming has posted some obstacles in the implementing of CPA in modern day wireless communication system.
This study used the 3D HFSS software developed by ANSYS to simulate the relevant parameters for the fabrication of the CPA. Two CPA horns were fabricated and the operation features measured using network analyzer and TAF-certified Far-Field antenna test equipment. Our measured results showed near identical operation features for the two fabricated CPA, indicating easy reproducibility of the antenna.
The good performance of CPA give a frequency broadband from 22.5-25 GHz, a return loss ≦ -15 dB, Gain ≧ 20 dB, and Axial ratio ≦ 1.3 dB.



Key words:、Circularly polarized antenna、 Communication、Far-Field
 

目錄
誌 謝 I
摘要 II
Abstract III
目錄 II
圖目錄 VI
表目錄 IX
第一章 緒論 1
1.1 前言 1
1.2 研究動機與研究目的 2
1.3 內容概述 3
第二章 圓極化天線 4
2.1 天線基本理論 4
2.1.1 天線概述 4
2.1.2 天線原理與傳輸線理論 6
2.1.3 天線基本参數 12
2.2 電磁波極化 13
2.2.1 極化理論概述 13
2.2.3 天線極化定義 14
2.2.3 圓極化天線的設計演進 18
第三章 高頻高功率圓極化天線設計與模擬 20
3.1 概述 20
3.2 高頻高功率圓極化天線模式轉換器設計 22
3.3 高頻高功率圓極化天線極化轉換器設計與模擬 23
3.4 高頻高功率圓極化天線整體設計與模擬 30
第四章 高頻高功率圓極化天線量測與結果分析 34
4.1 高頻高功率圓極化天線硬品介紹 34
4.2 高頻高功率圓極化天線實測 37
4.3 高頻高功率圓極化天線實測結果 44
第五章 結論 46
參考文獻 47

 

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