| 中文摘要 |
本論文中我們提出一種能夠支援行動通訊GSM/DCS/PCS/UMTS 與無線區域網路WLAN 應用的五頻單極行動手機天線。此天線是製作在玻璃纖維板上 (FR4) 並使用50 歐姆微帶線來做為天線的饋入結構。天線輻射體是將平面金屬片彎曲成類似矩形之形狀而成，此輻射體共振兩個中心頻率分別是900 與 2100兆赫的模態，經由適度調整天線的尺寸以增加其阻抗匹配並達到較寬的應用頻寬，本文天線所共振的兩個模態涵蓋行動通訊的900, 1800, 1900, 2000 與2450 兆赫的多頻操作頻帶，此外本文天線結構的整體尺寸為50×70×0.8 mm3，包含輻射體 (50×13 mm2) 與天線接地面 (50×55 mm2)，這尺寸的大小非常適合今日行動通訊產品的使用。詳細的天線設計、模擬與實驗結果將在論文中說明與探討。 |
| 英文摘要 |
This paper proposes a novel low-profile monopole mobile phone antenna capable of GSM, DCS, PCS, UMTS, and WLAN five-band operation. The proposed antenna is designed on an FR4 substrate and fed by a 50Ω microstrip line. Produced in this way, the antenna can be easily constructed by folding a planar meandered patch into a rectangular-tube-like structure. By using the antenna’s quarter wavelength resonant mode, two operation bands centered at 900 and 2100 MHz are obtained. The impedance bandwidth, which covers 900, 1800, 1900, 2000 and 2450 MHz operating bands is achieved by adjusting antenna parameters. The proposed antenna having a compact size of 50×70×0.8 mm3, which consists of a radiation portion (50×13 mm2) and a ground plane (50×55 mm2), is suitable for placing in mobile handsets. Both the antenna design and experimental results are presented and discussed. |
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