| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 107 === Modern mobile devices, such as tablets, access points, smart phones and notebooks, need to incorporate a variety of communication protocols. Different platforms may require dissimilar antenna characteristics. For notebooks, support for MIMO operation has already been a must. Mobile devices therefore need to install multiple antennas with good isolation performance.
In the first part of this study, a decoupling technique, which utilizes the notebook hinge region, has been developed. We found that by setting the hinge slot length as multiple of wavelengths, a decoupling null can be created. This is due to cancellation of conduction emission currents around the hinge slot. The isolation and the performance of the antennas can be improved with this technique. As a result, the distance between two types antennas can be extremely reduced and the radiation performance is not perturbed.
In the second part of this study, different antenna types have been tested with this decoupling technique to exam the applicability of this technique. At first, a dual-band inverted-F antenna has been designed. In general, good isolation can be achieved with the 2.4 GHz band, while some tuning in antenna spacing or displacement may be needed to achieve decoupling in the 5 GHz band. We also applied this technique to the existing designs. For antennas that utilize the ground edge for radiation, the proposed technique can improve antenna isolation significantly and the two antennas can be place in a close distance.
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