雙頻帶毫米波晶片單極天線，新型前端輻射天線及高前後輻射比之準八木天線之設計

Design of the Dual-Band Millimeter-Wave On-Chip Monopole Antenna, a Novel Structure for the End-Fire Pattern Antenna and High Front-to-Back Ratio Quasi-Yagi Antenna

黃玠瑝(Jie-Huang Huang)

指導教授 ： 周復芳

國立交通大學/電機學院/電信工程系所/碩士(2009年)

https://doi.org/10.6842/NCTU.2009.00674

摘要

本篇論文提出三種類型天線之設計。一是晶片天線之研究，一主題是研究能產生前端輻射場型的新型架構天線，最後一主題研究則是探討高前後輻射比準八木天線。
針對第一個主題，在此我們提出一個24 / 60GHz雙頻帶毫米波晶片單極天線。在天線饋入部分，我們採用共平面波導之架構。由於是雙頻帶的設計，在此有兩條主要的電流路徑產生輻射。而為了避免低頻帶的高階模頻帶的出現，我們加入兩條旁支帶線去耦合該頻帶。同時也使得高頻帶的效能變好。
第二個主題，在此我們提出一個新型的前端輻射架構天線。利用減少接地金屬面，加入與接地金屬形成短路的微帶金屬線以及選擇合適的位置以及適當的金屬大小，讓天線主體和接地的微帶線，兩者在相連之後，我們即可達到產生前端輻射的目的。並且，該天線之前後輻射比會隨著操作頻率的上升而逐漸增高。
而探討到第三個主題，在此我們提出一個高前後輻射比準八木天線。該天線包含三部分，一是反射元件，同時也是該天線的地，二是驅動元件，三是導向元件。在此為了提高天線增益以及前後輻射比，我們一共使用了三個導向元件。另外值得一提的是，為了提升該天線的效能，在此的驅動元件，亦即偶極天線，其中兩個雙臂並不是在相對稱的位置，兩者距離該天線的地互有遠近。其中從地延伸出來的偶極天線的單臂，其離地的距離比從訊號路徑延伸出來的偶極天線的單臂稍微遠一些。最後，我們還提出一能有效提升前後輻射比，天線增益也大為提高的改良架構。

關鍵字

晶片型天線 ； 前端輻射 ； 準八木天線

並列摘要

This paper proposes two designs of antennas. One is the research of the on-chip antenna, the other one is the topic of the high front-to-back ratio quasi-Yagi antenna.
For the first topic, a 24 / 60GHz dual-band millimeter-wave on-chip antenna is presented here. We design the feeding network by using the coplanar waveguide (CPW) structure. For the dual-band design, there are two major current paths to radiate. To avoid the harmonic frequency band of the low frequency-band, we add two strips to couple the harmonic frequency of the low frequency-band. Besides, the two strips let the higher frequency-band performance better.
Then, the second topic, a novel structure for end-fire antenna, is introduced here. By the reduce the ground plane, adding short-circuited with ground stubs and choosing the appropriate position and the size of the connecting metal squares where the antenna body and the short-circuited stubs are connected, we can obtain the end-fire radiation pattern. And the front-to-back ratio of this design will increase as well as the operating frequency is increasing.
And the third topic, a high front-to-back ratio quasi-Yagi antenna is demonstrated here. The antenna consists of three parts which are the reflector, or ground of the antenna, the driver, and the directors. It has three directors of this quasi Yagi antenna to improve the antenna gain and the front-to-back ratio. Here, it is worth to be noticeable that the positions of the dipole arms are not at the symmetric location. The one extended from the ground plane is a few farther to the ground plane than the one extended from the signal path for improving the performance. At last, we will show the enhance type of the high gain and high front-to-back ratio quasi-Yagi antenna.

並列關鍵字

chip antenna ； end-fire radiation pattern ； quasi-Yagi antenna

參考文獻

[1] C.-C. Lin, S.-S. Hsu, C.-Y. Hsu, and H.-R. Chuang, “A 60-GHz Millimeter-wave CMOS RFIC-on-Chip Triangular Monopole Antenna for WPAN Applications,” IEEE Antennas Propag. International Symposium, pp. 2522-2525, 9-15 Jun. 2007.

[2] S.-S. Hsu, K.-C. Wei, C.-Y. Hsu, and H.-R Chuang, “A 60-GHz Millimeter-Wave CPW-Fed Yagi Antenna Fabricated by Using 0.18-μm CMOS Technology,” IEEE Electron Device Lett., Vol. 29, Iss. 6, pp. 625-627, Jun. 2008.

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