發(fā)布時間：2019-06-15 00:29

【摘要】：隨著移動通信進入4G時代,消費者對移動通信終端的要求日益增多。而這將使移動終端中的天線設計變得更加困難。移動終端中高度集成的功能使得天線覆蓋頻帶更寬,使得多天線單元間必須具有良好的隔離度以保證性能。輕薄化的外觀趨勢使天線設計空間更為有限,尤其使最低頻諧振的實現(xiàn)更具挑戰(zhàn)。近期金屬質感手機的流行使得內(nèi)置手機天線性能受到金屬邊框結構的極大影響。對表征人體吸收電磁輻射的參數(shù)SAR的控制也引起極大重視。首先,在符合如今流行的手機尺寸的基板上設計出一款覆蓋WLAN全頻段的天線和一款可覆蓋LTE700的三頻段天線。對頻帶寬度、輻射方向圖、效率、電流分布等指標進行研究,并將WLAN天線的設計加工實物,進行測試驗證。其次,設計一款覆蓋移動通信高頻段的LTE MIMO天線,通過耦合饋電方式增大帶寬。對天線的頻帶寬度、輻射方向圖、效率、增益、電流分布等進行研究,并對比天線單元在基板上的兩種不同的安放位置,研究位置對天線單元間隔離度和相關系數(shù)的影響。依照設計對天線進行加工實測,所得測試結果與仿真結果吻合。最后,設計一款應用于帶有閉合金屬框架結構手機的天線,利用金屬邊框和內(nèi)置天線的共同作用來覆蓋移動通信七頻段。在設計過程中還考慮到手機實際的復雜環(huán)境,加入多種部件以更接近真實。對所設計天線在自由空間、頭模型、頭和手模型三種狀態(tài)下進行研究,包括頻帶寬度、效率等重要參數(shù)。并對設計天線的SAR值進行模擬研究。
[Abstract]:With the entry of mobile communication into 4G era, consumers have more and more requirements for mobile communication terminals. This will make the antenna design in the mobile terminal more difficult. The highly integrated function in the mobile terminal makes the antenna coverage band wider, so that the multi-antenna elements must have good isolation to ensure the performance. The lightweight appearance trend makes the antenna design space more limited, especially makes the realization of minimum frequency resonance more challenging. Recently, the popularity of metal texture mobile phone makes the antenna performance of built-in mobile phone greatly affected by the metal frame structure. The control of the parameter SAR, which represents the absorption of electromagnetic radiation by human body, has also attracted great attention. First, a full-band antenna covering WLAN and a three-band antenna covering LTE700 are designed on a substrate that fits the size of today's popular mobile phone. The frequency band width, radiation pattern, efficiency, current distribution and other indexes are studied, and the design and processing of WLAN antenna are tested and verified. Secondly, a LTE MIMO antenna covering the high frequency band of mobile communication is designed, and the bandwidth is increased by coupling feed. The frequency band width, radiation pattern, efficiency, gain and current distribution of the antenna are studied, and the effects of the position on the interval distance and correlation coefficient of the antenna element are compared with the two different placement positions of the antenna element on the substrate. According to the design, the antenna is processed and measured, and the test results are in good agreement with the simulation results. Finally, an antenna with closed metal frame structure is designed, which uses the combination of metal frame and built-in antenna to cover the seven-band of mobile communication. In the design process, the actual complex environment of the mobile phone is also taken into account, and a variety of components are added to get closer to reality. The designed antenna is studied in three states: free space, head model, head model and hand model, including frequency band width, efficiency and other important parameters. The SAR value of the designed antenna is simulated and studied.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN828.6

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本文編號：2499828