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TELEcommunications & MICrowaves
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Design and Evaluation of Wearable Antennas using Conductive Textiles by Ping Jack Soh Flexible textile antennas are seen as a promising alternative to conventional antennas which are fabricated using rigid metallic and substrate laminates. The increasing demand for multiband wireless operation in a single hardware, and the need to provide end users with on-body device integration have heightened research interest in this area. Minimal degradation of antenna bandwidth, reflection coefficient, efficiency and radiation characteristic must be ensured to enable successful on-body operation. Although all aforementioned parameters are essential in determining overall operation effectiveness, antenna-to-body capacitive coupling and power absorption are expected to cause severe efficiency and bandwidth degradation. However, the latter issue could be solved effortlessly if the antenna could be designed with a broader bandwidth than required for a specific operation at hand. This will then effectively render the designed antenna to be immune against reflection shifts when placed on body. The seminar presents the major investigation carried out thus far and discusses their findings, as follows. (1) The design and development of a broadband textile antenna based on the planar inverted-F antenna (PIFA) topology; (2) Design and evaluation of dual-/multi-band antennas using the self-similar fractal concept; and finally (3) Free-space efficiency evaluation efforts in various measurement facilities, utilizing two distinct techniques - the stirred chamber method and the gain-efficiency method. Broadband Power Line Communications by Linyu Wang A few topics will be discussed: 1) a comparison of the different possibilities for protocols that can be used to transmit data over power lines in order to reduce the latency in the access network. This results in a suggestion for an improved protocol. 2) then the resource allocation problem for access broadband power line communications (PLC) for power grids monitoring and control is discussed . The proposed loading algorithm attempts to minimize the BER while guaranteeing a certain throughput for Amplitude Differential Phase Shift Keying (ADPSK) modulation, where the attenuation varies significantly in function of the frequency. A performance comparison between the proposed algorithm and the Fischer-Huber algorithm will be discussed. 3) Also simulations and measurements of a 4 wire standard power distribution line taking into account all couplings between the lines, and allowing not only to determine the attenuation, but also the interference characteristics of that transmission medium will be presented |
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