• Title/Summary/Keyword: Foamex

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A Study on the Characteristics of Dual-band Plastic Chip Antenna for Mobile Terminal using the Foamex Materials (Foamex 매질을 이용한 이동통신 단말기용 듀얼밴드 플라스틱 칩 안테나 특성에 관한 연구)

  • Lee, Young-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.2
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    • pp.130-135
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    • 2005
  • In this papers, we made study for plastic chip antenna, the plastic is Foamex with the circle of PVC and its electric characteristics are dielectric constant 1.9, insulation intensity 112 KV/cm. The proposed antenna is same as the conventional antennas are usually constructed with ceramic chip, which are not fragile in nature and don't tend to break easily. Therefore the proposed antenna with its advantage is attractive for application in mobile antenna. In order to valid the proposed papers, it is implemented the antennas of four types and experimented. From the results, we conformed that the antennas are operated at the dual band which is cellular band and Korea-PCS band. And the gain of the antennas has about above -2 dB and the pattern is same as conventional antennas. From this papers, the realized antennas using Foamex material will be application for mobile phone antenna.

A Study on Characteristics of Triple-band Plastic Chip Antenna for Mobile Terminal using Foamex Materials (Formax 매질을 이용한 이동통신 단말기용 삼중대역 플라스틱 칩 안테나에 관한 연구)

  • Lee, Young-Hun;Song, Sung-Hae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.12
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    • pp.2210-2216
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    • 2007
  • In this paper, triple-band plastic chip antennas for mobile terminal are investigated. Plastic chip antenna is composed of Foamex material with circle of PVC(Polyvilyl chloride). For its electric characteristics, the dielectric constant is 1.9, the insulation intensity is 112KV/cm. Plastic chip antennas are don't tend to break easily against to external shock, have more gain and efficiency than ceramic chip antennas. Triple-band plastic chip antennas of four type are implemented and experimented. From the experiments results, the antenna resonate at the triple-band, the gain of the antennas has about above -2dB, the pattern is ommidirectional the same as the conventional antennas. So, the antennas realized with Foamex material will be application for mobile phone antenna operated at the triple band which is cellular band and Korea-PCS band and ISM band or the antenna for other wireless communication system.

Evaluation of Combustion Characteristics of Outdoor Advertisement Materials (옥외 광고물 소재의 연소특성 평가)

  • Eom, Sang-Yong;Kim, Kyoung-Jin;Lee, Su-Kyung
    • Fire Science and Engineering
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    • v.26 no.5
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    • pp.79-84
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    • 2012
  • Combustion characteristics of outdoor advertisement materials were evaluated for fire risk assessment about fire expanding. At this study, the flame retardancy and the limiting oxygen index (LOI) was measured by UL 94 and ASTM D 2863 respectively. At the result of flame retardancy, foamex was V-0 grade and those of others were out of grade. LOI measurement showed that the LOI of foamex was highest in the samples. The cone calorimeter test was done by ISO 5660-1 to find the combustion characteristics. The cone calorimeter test showed that the outdoor advertisement materials were not good to prevent of fire expanding. The time to ignition (TTI) of flex was the fastest and the peak heat release rate (PHRR) as well as the total heat release (THR) of acrylic panel was higher than those of others.