| Summary: | 碩士 === 國立高雄師範大學 === 光電與通訊工程學系 === 105 === In this thesis, Three designs of dual-band antennas and multi-band antenna for smartwatch applications are proposed. The first design is an inverted-F antenna. It uses a dual-branch strip and a short-circuit strip to achieve dual-band (GNSS 1.6 GHz、Bluetooth/Wi-Fi 2.4 GHz) operation. Then, the loop antenna for dual-band operation is investigated. In this design, two meandering strips are electromagnetically excited by a feeding strip, which thus achieves 1.6 and 2.4 GHz dual-band operation. Finally, the third design is multi-function antenna for smartwatch application. This antenna system is composed of an inverted-F antenna and an open-slot antenna. The inverted-F antenna has a triple-branch strip, and uses an L-shaped highpass matching circuit for enhancing the low-band operating bandwidth, which can cover the bandwidths of 698 ~ 960 and 1710 ~ 2170 MHz . The open slot antenna is excited by a double-branch microstrip feedline with a chip capacitor. It can achieve the 1.6 and 2.4 GHz dual-band operation. In addition, the human wrist effects on the antenna’s performances are also investigated. When the proposed three antennas are mounted on a human wrist, although the operating frequencies of the antennas are nonsignificantly affected, their antenna efficiencies are obviously decreased. The results are mainly due to the wrist is a high dielectric constant caused by the conductive organization.
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