在此研究中，我們引用單極天線之基本技巧，並結合全新設計的 曲折型天線圖樣，在市售FR4雙層感光印刷電路板上設計、製造出雙 頻天線。 首先設計一支分別應用在802.11a/b/g的曲折型單極天線A，再經 由電磁模擬軟體(HFSS)驗證。可由反射系數、輻射場型和增益各種天線特性中來判斷其設計的優劣。 再設計出另一支天線B，2.4GHz共振路徑經過螺旋狀結構後，可 使得整體天線面積縮小約為天線A的一半，再經過模擬後，此天線於 低頻的頻寬增加了360 MHz，證實修改天線共振路徑和方向後可以符 合在無線區域網路之應用，並有效減少使用面積，增加操作頻寬和增益。 In this study,we had designed and manufactured the dual band antennas on commercial PCBs by using the basic techniques of printed monopole antenna and combining with new meander-line antenna patterns. First,design one meander-line monopole antenna A use on 802.11a/b/g application,after the verification of the electromagnetic simulation software(HFSS) ,we can check return loss、radiation patten and gain from various kinds of parameter characteristics of the antenna to know the design is good or not. Finally,design another meander-line monopole antenna B,After check by HFSS,the low frequency bandwith improve 360MHz that prove to modify the resonance path and direction can conform to WLAN application and reduce the antenna area,improve the low frequency bandwith and Gain.
