無線感知系統之天線設計

Sensor Network Antenna Design

巫宗祐(Tzung-Yu Wu)

指導教授 ： 鄭士康

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.02242

摘要

無線感知網路(wireless sensor network)是近年來相當熱門的技術，隨著技術發展，漸漸出現一些具有商業價值的應用，相信不久的將來，生活周遭會充滿應用這項技術的產品。但是我們發現目前的天線設計是有問題的，由於感知節點內能應用的空間十分有限，我們將無法避免由電池或電路板所構成的金屬環境對天線造成影響。為了解決金屬環境的問題，文中先藉由簡單的無線通道計算和IEEE 802.15.4所制定之規格，決定不同室內環境下天線所需的增益值和頻率，再對於應用時天線下方的金屬環境，決定天線的設計目標。本研究提出一種適用於感知節點上的貼片天線設計，並且利用短路金屬柱達到縮小面積的目的，同時對於一般貼片天線頻寬不足的問題，我們利用寄生天線的方式增加頻寬。文末特別針對天線下方為金屬導體時，比較常用於小型通訊產品之印刷導置F天線與本研究之設計，實驗結果可發現，本文所提出之設計對於天線下方的金屬環境較為不敏感。

關鍵字

無線感知系統 ； 貼片天線 ； PIFA

並列摘要

In recent years there has been an increasing focus on the technology of commercial products associated with the development of wireless sensor network. In the near future, we believe that wireless sensor network will be all around and incorporated into our daily life. But we find a problem with the antenna design of wireless sensor. The antenna suffers from the influence of metal environments, such as the battery. And we can’t abate the interference because of the limited space available in the sensor node. In this article, we use the standard suggested by IEEE 802.15.4 to decide the gain and frequency required for different indoor environment. We chose antennas suitable for the metal environment at the same time. In this thesis, we propose a patch type antenna with a shorting wall and a parasitic antenna. The shorting wall is to reduce the size of patch. The parasitic antenna is to increase the bandwidth. We also prepared an experiment to test the printed inverted F antenna and this work in the metal environment. The experimental results show that our antenna is less sensitive to the metal environment.

並列關鍵字

sensor network ； patch antenna ； PIFA

參考文獻

[1] S.-W. Su, J.-H. Chou, A.Chen and L. Tai, “Compact patch antenna mountable above conducting plate for WLAN operation,” Electronics Letters, Vol.42, pp.1130-1131, Sept.2006.

[2] C.-C. Lin, G.-Y. Lee, and K.-L. Wong, “Surface-mount dual-loop antenna for 2.4/5 GHz WLAN operation,” Electron. Lett., Vol.39, pp.1302-1304, Sept.2003.

[3] S.-W. Su, S.-T. Fang, and K.-L. Wong,“A low-cost surface-mount monopole antenna for 2.4/5.2/5.8 GHz band operation,” Microwave and Optical Technology Letters, Vol.36, pp.487-489, Mar.2003.

[4] NCKU CSIE Advance Data System Lab, “Wireless Sensor Networks”.

[5] E. Shih et al., “Physical Layer Driven Protocol and Algorithm Design for Energy-Efficient Wireless Sensor Networks,” Proc. ACM MobiCom, July 2001.