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Design concept of multiband antennas under the influence of the human body
Jung, Byungwoon,Lee, Hyunkyu,Byun, Joonho,Won Jung, Chang,Park, Myun-Joo,Chung, Young-Seek,Lee, Byungje Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.2
<P>A novel wideband antenna, consisting of a double T-shaped element and a coaxial cable, is proposed for multiband applications including AMPS, GSM, DCS, PCS, UMTS, and WiBro bands. The proposed antenna also mitigates the degradation of an antenna performance due to the human body. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 513–515, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24086</P>
Young‑Gil Jung,Wonseok Yang,Jae Ik Hyun,Shae K. Kim,Hyunkyu Lim,Do Hyang Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Three alloys (Mg–6Zn–1.2Y, Alloy I; Mg–3.65Zn–1.65Y, Alloy II; and Mg–4.3Zn–1.4Y, Alloy III) with same volume fractionand grain size were designed to evaluate the effects of the I-phase (Mg3Zn6Y) and W-phase (Mg3Zn3Y2), which are themajor phases in Mg–Zn–Y alloys, on the mechanical properties. The tensile strength of Alloy I with the I-phase at roomtemperature was the highest among the tested alloys because the coherent interface between the I-phase and the α-Mg phasewas more resistant to cracking than the incoherent interface between the W-phase and the α-Mg phase. A cross-sectionalmicrostructure analysis of a sample that was tensile-tested at 423 K revealed that the morphology of the I-phase remainedrelatively stable. In contrast, the W-phase was broken and fragmented during the tensile test at 423 K because it had higherbrittleness under the test conditions. Therefore, the tensile and creep properties of Alloy I at 423 K were better than thoseof Alloys II and III containing the W-phase. According to the results, the I-phase in the Mg-Zn-Y alloy was more beneficialto the mechanical properties at room temperature and 423 K than the W-phase.