印刷式螺旋天線與超寬頻饋入網路之圓極化整合設計

Integrated Design of Printed Spiral Antennas and Ultra-Wideband Feeding Networks for Circular Polarization Operations

蘇育成(Yu-Cheng Su)

指導教授 ： 林怡成

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2020年)

https://doi.org/10.6342/NTU202001674

摘要

本論文旨在設計及研製超寬頻螺旋天線與超寬頻饋入電路，以整合成超寬頻圓極化天線。首先，我們設計90°之耦合器，此元件之操作頻寬可涵蓋1.1 GHz至5.8 GHz。接著，我們提出180°之立體平衡器，且可達到1.2 GHz至6 GHz之頻寬。此外，我們亦設計阿基米德螺旋天線，此天線之模擬頻寬為2.5 GHz至8 GHz。

在驗證上，我們實做了四埠之90°耦合器、單一螺旋天線與180°之平衡器所組成之天線模組以及兩個螺旋天線結合兩個180°之平衡器與單一90°之耦合器而成之1 x 2序列式旋轉天線陣列。在量測方面，其結果均與模擬之趨勢一致，單一螺旋天線之整合可達到2.3 GHz至6.2 GHz之操作頻寬；而1 x 2序列式旋轉螺旋天線陣列之操作頻寬可涵蓋2 GHz至6 GHz。此外，在1 x 2序列式旋轉螺旋天線陣列之中，饋入網路裡耦合器之隔離埠可視為差分埠進行操作，並且可於正上方產生圓極化之差分場型，並搭配視為加總埠之耦合器輸入埠，此1 x 2天線陣列將可作為追蹤雷達與通訊之應用。

關鍵字

超寬頻 ； 圓極化 ； 平衡器 ； 耦合器 ； 螺旋天線 ； 序列式旋轉

並列摘要

This thesis presents the design and implementation of both the ultra-wideband spiral antennas and the required ultra-wideband feeding circuits for the ultra-wideband circularly polarized operations. First, we designed a 90-degree directional coupler with a bandwidth covering 1.1 GHz to 5.8 GHz. Second, we proposed a compact folded 180- degree balun with a bandwidth range from 1.2 GHz to 6 GHz. Third, we designed an Archimedean spiral antenna with a differential feed covering the bandwidth between 2.5 GHz and 8 GHz.

We built the prototypes for the design verification of the proposed designs, including the 4-port 90-degree directional coupler, the single spiral antenna integrated with the 180-degree balun, and the 1 x 2 antenna array of sequential rotation integrated with two 180-degree baluns and a 90-degree coupler. The experimental results are consistent with the simulated results for each developed prototypes. The single spiral antenna has an overlapped bandwidth of 2.3 GHz to 6.2 GHz. The 1 x 2 sequential rotation spiral antenna arrays also perform a decent bandwidth from 2 GHz to 6 GHz. Additionally, the isolated port of the coupler can operate as a Difference port that the radiation pattern is a CP difference pattern. Together with the input port as a Sum pattern, the developed 1 x 2 arrays can be used for the radar tracking and communication applications.

並列關鍵字

Ultra-Wideband ； Circular Polarization ； Balance Feeding ； Power Divider ； Spiral Antenna ； Sequential Rotation

參考文獻

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