• Title, Summary, Keyword: Co-Planer Waveguide

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Electric Fuel Sender Apparatus for the Vehicles Using CPW Transmission Line (CPW 전송선을 이용한 전자식 자동차용 연료 센더 장치)

  • Son Tae-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.4
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    • pp.380-386
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    • 2006
  • Electric fuel sender fur the vehicle fuel gauge system was designed and fabricated based on the CPW(Co-Planer Waveguide) transmission line theory. It is applied on this system that characteristic impedance of RF transmission line can be varied by the surrounded material of the line. By the characteristic impedance owing the level of gasoline or diesel fuel in vehicle fuel tank, CPW line has corresponding reflected signal as much as changed impedance. Detected signal is amplified, and delivered to fuel indicator into cluster unit on dash board. Conventional floating mechanical buoy level gauge has several defects as low reliability and high break down rate by mechanical operation, and has not good linearity for the fuel level difference. CPW line with electric circuits are constructed on 1.6 mm thickness epoxy substrate, and measurement shows that this system has more accurate level and better linearity than conventional mechanical system. New electric fuel sender which has good productivity with long lifetime and low-in-cost by the SMT chip assembling could be replaced this system with conventional floating buoy system.

A Design of Small PCB Antenna using Helical Structure for IMT-2000 Handsets (헬리컬 구조를 이용한 IMT-2000 단말기용 소형 인쇄기판형 안테나 설계)

  • 김성철;이중근;김혜광
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.5
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    • pp.444-449
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    • 2003
  • In this paper, a PCB(Printed Circuit Board) antenna for IMT-2000 is designed and analyzed. The antenna has a helical structure with via-holes and lines on FR-4($\varepsilon$$\sub$${\gamma}$/=4.6 ) PCB, and the type of feeding is GCPW(Grounded Co-Planar Waveguide). Using HFSS of Ansoft, the antenna was designed and the measured results of frequency and radiation characteristic,3 with VSWR<2.0 are satisfied within operating frequency band of 1.920∼2.170 GHz. And it has resonating frequency of 2.045 GHz and a bandwidth of 321 MHz. The radiation gain of the antenna was measured to be -1 dBi.