本文利用印刷式倒F型天線來進行設計多頻段天線，其中頻率包含LTE WLAN & GPS頻率，應用於14吋筆記型電腦的環境與架構內。本天線設計頻率為0.7 GHz~5 GHz，其可使用的頻段將包含LTE系統與WLAN兩種不同系統，並符合業界知名品牌電腦無線網路規範，並以電流分佈及天線場型等分析數據，了解該天線在於環境的變化性與差異性，加以分析比對。 而本文所設計的天線在放置在14吋筆記型電腦裡，可克服筆記型電腦複雜的環境對天線效能的影響，進而提升天線輻射效能，並將LTE操作頻率範圍低頻(698 MHz~960 MHz)與高頻(1710 MHz~2690 MHz)、WLAN操作頻率範圍(2.4 GHz~5.8 GHz)與GPS操作頻率範圍(1575 MHz & 1602 MHz) 整合於單一支天線。由於天線是平行於接地面與筆記型電腦的螢幕(LCD)，因此容易在兩平行面間產生電容效應，使得電流分佈聚集在接地面與筆記型電腦的螢幕上，無法分佈在天線的輻射體上。此論文利用印刷式倒F型天線在接地平面有一短路接點，進而消除兩平行面間，所產生的電容效應，使電流能夠平均在輻射體上，進而提升其輻射效能。本文所設計天線實際測試總輻射功率值與天線資料吞吐量皆可達到業界知名品牌標準。 In this paper, the multi-band printed inverted F antennas are presented for the 14-inch notebook computer. The frequency of the antenna is set from 0.7GHz ~ 5GHz, which includes the long term evolution (LTE) system, wireless local area network (WLAN) and global positioning system (GPS). The current distribution and antenna radiation field for different environments are analyzed to meet the wireless network specifications of industry-renowned brand notebooks.
The antenna is put in a 14-inch notebook to test its performance for the complex notebook layout and the environment. The antenna is designed to operate for low frequency band (698 MHz~960 MHz) and high frequency band (1710 MHz~2690 MHz) of the 4 generation LTE, WLAN (2.4 GHz~5.8 GHz), and GPS (1575 MHz & 1602 MHz). Because the antenna is parallel to the ground plane and liquid-crystal display (LCD) screen of the notebook, the capacitor effect is induced on the planes. As a result, the electric currents are accumulated on the LCD plane instead of the antenna. By setting the short point on the planes, the radiation performance of the antennas is improved. The total radiation power and throughput for the antennas have been tested by the experiments. It is shown that the designed multi-band printed inverted F antennas can meet the requirement for notebooks.
