| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 95 === Two topics are presented in this thesis. First is a conformal slot antenna with omnidirectional coverage. Second is algorithms for automated antenna blockage assessment.
In the first part of this thesis, a planar slot antenna was proposed. By adjusting the cavity configuration, the antenna can be made to provide omnidirectional pattern on the horizontal plane. Furthermore, dielectric loading of different dielectric constants are applied to minimize the
antenna size.
In the second part of this thesis, approaches that aim to reduce SAR on human body were attempted. Algorithms were deviced for automated antenna blockage assessment. These algorithms are used to determine the presence and location of obstacles in adjacent to a mobile device, A multi-antenna mock-up was fabricated to house several antennas at
various locations on a palm-size device. According to the variation in the amount of coupling among antennas, the direction of an obstacle can be decided by the blockage assessment algorithm, which is built on neural network. The proposed algorithm was implemented in this work to
differentiate a right left-hand holding scenario and hence verified its validness.
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