| As 4G mobile communication coming, consumer take up more and more demand for mobile terminal. And it will make the antenna design in mobile terminal more difficult.Mobile terminal with highly integrated function make the antenna to cover wider frequency band, and great isolation between antenna elements. The trend of light and miniaturization make more challenges to achieve the low frequency resonance. The mobile with metal frame become fashion, while the metal frame have great side effect on antenna performance. As a characterization of electromagnetic radiation acting on human body, SAR attracts more attention.First of all, an antenna is designed on the PCB board to satisfy the need of tri-band WLAN. Another is designed for communication frequency bands including LTE700.The parameters of bandwidth, radiation pattern, efficiency and current distribution are studied. The design of the tri-band WLAN antenna is processed and measured to verify the simulated results.Secondly, a LTE MIMO antenna system covering communication high frequency bands is designed by coupled feed to increase the bandwidth. The parameters of bandwidth, radiation pattern, efficiency, gain, current distribution are studied. The two different positions of antenna elements on board are compared to investigate the isolation and correlation coefficient between them. The design of LTE MIMO antenna is processed and measured.The measurements agree with the simulated results.At last, a hepta-band WAN antenna design for mobile devices with closed metal frame by using both metal frame and internal antenna. Considering the complex environment in mobile, some components are embedded to make simulation model more reality. The parameters of bandwidth and efficiency are studied when the design antenna work in the states of free space, head model, head and hand model. The simulated SAR values of the design antenna are studied. |
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