在本篇論文中，我們提出一種應用在802.11a/b/g 無線區域網路的雙
T 型及十字型單極天線。使用一些小型化雙頻單極天線(Monopole Antenna)
的設計技術，並透過電磁模擬軟體HFSS(High Frequency Structure
Simulator)與實作來驗證。本文研製一個以微帶線(Microstrip Line)饋入之
雙T 型及十字型單極天線(Monopole Antenna)，天線結構主要由微帶線
(Microstrip Line)當傳輸線，與雙T 型及十字型輻射金屬片所組成，並直
接印刷於PCB 基板上。以單極微帶天線為基礎來呈現設計，應用在無線
區域網路，符合802.11a/b/g(2.4/5.2GHz)的要求。其中802.11b/g(2.412∼
2.483GHz)必需要有71MHz 頻寬及802.11a(5.15∼5.875GHz)必需要有
725MHz 頻寬。在結構上，此天線為單面結構，易於印刷製作，可應用於
上述頻帶之無線通訊系統上。

A novel and simple printed dual band double T monopole antenna is
proposed. The antenna comprises two separate stacked T shaped monopoles
of different sizes, which generate two separate resonant modes for the desired
dual-band operations. The proposed antenna has a low profile and can easily
be fed by using a 50 Ω microstrip line. Prototypes of the proposed antenna
designed for WLAN operations in the 2.4GHz and 5.2GHz bands have been
constructed and tested. Good radiation characteristics of the proposed antenna
have been obtained. Effects of varying the monopole dimensions and the
ground plane size on the antenna performance have also been studied.

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