• Title/Summary/Keyword: Rat-race coupler

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A Harmonic Suppressed Design of Size Reduced Ring-Hybrid Using Folded Line Structure (소형화 및 고조파 특성이 개선된 접힌 구조의 링-하이브리드의 설계)

  • Lee Hong-Seop;Lee Chul-Heui;Hwang Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.9 s.112
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    • pp.845-851
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    • 2006
  • Folded lines are applied to design a compact microstrip ring hybrid. Using the proposed structure we achieve both significant size reduction and good harmonic suppression with the same results of conventional ring hybrid at 2.41 GHz. Including the third harmonic frequency, up to 11 GHz band harmonics are suppressed to -20 dB. The size of the proposed ring-hybrid is reduced to one forth of the conventional ring hybrid. The measured frequency responses agree well with simulated ones.

Design of a 4-bit Digital Phase Shifter in Quasimillimeter Wave Band for Satellite Communication (준밀리미터파대 위성통신용 4-bit 디지털 위상변위기의 설계)

  • 신동환;임인성;김우재;민경일;오승엽
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.3
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    • pp.461-470
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    • 1999
  • This paper presents the description of a 4-bit digital p-i-n diode phase shifter that was designed for quasimillimeter wave band satellite receiver to use in phased-array systems. 180$^{\circ}$ and 90$^{\circ}$ cells are designed in reflection type that consists of a 3-dB rat-race hybrid coupler, 45$^{\circ}$ and 22.5$^{\circ}$ cells are designed in loaded-line type to reduce the size of circuit and the number of diode to be used. The 4-bit phase shifter uses eight p-i-n diodes mounted in the microstrip circuit. The average insertion loss for the 16 phase states is 6.92dB over the 19.8~20.3 GHz band and maximum phase error is 6.2$^{\circ}$ at 20 GHz.

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