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As IoT (Internet of Things) systems using wireless standards sharing the 2.4 GHz ISM band become widespread, radio interference often disturbs data communication. In order to mitigate interference-related problems, it would be helpful to have a method that determines to which standard a received packet belongs. However, conventional methods do not analyze the actual environment of congestion nor do...
In this paper, we report development and performance verification of a wireless body area network prototype compliant with the MAC protocol of the IEEE802.15.6 BAN. The relaying functionality which utilizes a relay between a hub and a node is confirmed when a direct path between them is not available due to shadowing effects. The delay due to switching to the relay topology is less than one second...
This paper presents the design of a novel dual-band patch antenna to be used for human BAN communications applications. The antenna has been designed to provide similar monopole-like radiation properties at 950MHz/2.45GHz ISM bands commonly used in BAN wireless communication technologies. The proposed antenna consists of two short circuited ring patch elements integrated on the FR4 substrate. Numerical...
We investigated lamellar twisting manner in a banded spherulite, the blend of poly-(ɛ-caprolactone) and poly-(vinyl butyral), with scanning microbeam X-ray diffraction. We obtained the diffraction contour intensity map with a scanning pitch of 1 μm by employing a rotation of a spherulite around its radial direction along which the microbeam scans. The results confirm that the twisting manner depends...
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