研究生: |
余博仁 Bo Ren Yu |
---|---|
論文名稱: |
高功率毫米波旋轉接頭 High-Power Millimeter-Wave Rotary Joint |
指導教授: |
張存續
Tsun Hsu Chang 朱國瑞 Kwo Ray Chu |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 55 |
中文關鍵詞: | 旋轉接頭 、TE01 、TE02模式轉換器 |
外文關鍵詞: | rotary joint, TE01, TE02 mode converter |
相關次數: | 點閱:1 下載:0 |
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本篇論文將研究設計一個Ka頻段之TE01高頻微波旋轉接頭,並加工實作實際量測,與模擬結果做比較。
在研究分析上使用到高頻結構模擬軟體(Ansoft HFSS 9.0),模擬實際情況會遇到的問題,以及比較各種傳播模式優劣。決定高頻微波旋轉接頭作用機制後,再更進一步設計,對各結構做優化,以提高頻寬以及穿透效率。
利用HFSS模擬圓形波導管,管壁間隙以及波導管彎曲對不同模式的影響,模擬結果,前六個最低模式之中,TE01模式擁有最好的傳播特性,幾乎不受管壁間隙及波導管彎曲的影響;此外TM01、TM11模式所受之影響最為劇烈,推測是表面電流遭間隙截斷的緣故。
利用HFSS模擬四個連接埠側邊激發之TE01模式轉換器,轉換效率高達98.7%,穿透-1dB頻寬為8.5 GHz (24%),損耗主要來自於結構的反射以及銅的歐姆損耗。
低功率量測使用到向量網路分析儀(VNA, Agilent 8510C),量測結果,本實驗設計之TE01高頻微波旋轉接頭在Ka頻段,30 GHz至40 GHz,穿透率與旋轉角度無關,且相當接近HFSS模擬結果,穿透效率為94%,穿透-1dB及-3dB頻寬分別為5.7 GHz(16.8%)和8.5GHz(24.2%)。
高功率量測用到高功率分佈作用速調放大器(EIA),量測結果,本實驗設計之TE01高頻微波旋轉接頭可以於高功率能量之下操作,不會有電火的現象,至少可以承受峰值功率210W(duty: 18%,平均功率38W),穿透效率在-1dB以上,且不受旋轉角度的影響。
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