圓極化微帶天線的設計與研究畢業論文(已修改)

　

【正文】 摘 要微帶天線具有體積小，重量輕，低剖面，制造成本低，易于批量生產，易于和微帶線路集成等特點，能得到單方向的寬瓣方向圖，易于實現雙頻段、雙極化等多功能工作。這些優點使得微帶天線在大約 100MHz～100GHz 寬廣頻域上，廣泛應用于包括衛星通信、雷達、遙感、制導武器以及便攜式無線電設備。 論文首先回顧了微帶天線的發展史，介紹了它的結構、優缺點及應用，然后給出了微帶天線的幾種分析方法，包括傳輸線法，空腔模型法，積分方程法等，并介紹了微帶天線圓極化的原理和實現方法以及微帶天線的饋電方式。然后在Ansoft HFSS 中創建了一個單饋圓極化微帶天線和雙饋圓極化微帶天線，分析了S11 和 VSWR 參數，畫出了方向圖。為了實現圓極化，進行了軸比的優化仿真，達到了較為理想的結果。關鍵詞：微帶天線、圓極化、軸比AbstractThe microstrip antennas has the volume to be small, the weight is light, the low section plane, the production cost is low, easy volume production, easy and characteristics and so on microstrip line integration, can obtain the single direction wide petal directional diagram, easy to realize, the double polarization dual range and so on multipurpose work. These merits cause the microstrip antennas in approximately the 100MHz100GHz broad frequency range, widely applies in includes the satellite munication, the radar, the remote sensing, the guided weapon as well as the portable wireless apparatus.The paper first reviewed microstrip antennas39。s history, introduced its structure, the good and bad points and the application, then have given microstrip antennas39。s several analysis method, including the transmission longbase method, the cavity modeling, the integral equation law and so on, and introduced the microstrip antennas circular polarization39。s principle and realizes the method as well as microstrip antennas39。s feed method. Then AnSoft Hfss in the creation of a singlefed circular polarization microstrip antenna and doublefed circular polarization microstrip antenna and doublefed circular polarization microstrip antenna, the analysis of the S11 and VSWR parameters, to draw a pattern. In order to achieve circular polarization, the axis carried on the optimization simulation, to a more satisfactory results.Key words：microstrip antenna；circular polarization。 axial ratio目 錄摘 要 .....................................................................................................IABSTRACT ...........................................................................................II目 錄 ...................................................................................................III第一章 緒論 ...........................................................................................1167。 微帶天線的發展 ................................................................................................................1167。 微帶天線的定義和結構 ....................................................................................................1167。 微帶天線的優缺點 ............................................................................................................2167。 微帶天線的應用 ................................................................................................................3第二章 微帶天線的原理技術 ...............................................................4167。 微帶天線的輻射機理 ........................................................................................................4167。 微帶天線的分析方法 ........................................................................................................5167。 傳輸線模型法 .......................................................................................................5167。 空腔模型法 ...........................................................................................................8167。 積分方程法 ...........................................................................................................8167。 微帶天線的饋電方法 ........................................................................................................9167。 微帶天線圓極化技術 ......................................................................................................10167。 圓極化天線的原理 .............................................................................................10167。 圓極化實現技術 .................................................................................................11167。 其他形式的微帶天線 ......................................................................................................15第三章 圓極化微帶天線的仿真與優化 .............................................19167。 ANSOFT HFSS 高頻仿真軟件的介紹 .............................................................................19167。 圓極化微帶天線的仿真優化 ..........................................................................................19167。 圓極化微帶天線的仿真設計 ..............................................................................19167。 天線軸比的優化 ..................................................................................................22第四章 雙饋圓極化微帶天線的設計 ............