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[Keyword] microstrip couplers(1hit)

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  • Parallel Coupled Microstrip Couplers Compensated with Periodic Floating-Conductors on Coupled Edges

    Takao FUJII  Isao OHTA  Tadashi KAWAI  Yoshihiro KOKUBO  

     
    PAPER-Microwaves, Millimeter-Waves

      Vol:
    E91-C No:5
      Page(s):
    780-787

    This paper presents a new quarter-wavelength microstrip coupler compensated with a periodic sequence of floating metallic strips in the slots on the inner edges. After describing the characteristics of the coupled-line, as an example, a 15-dB coupler is designed and a high directivity of 30 dB or more in theory is obtained over a full band of a single-section coupler. Next, couplers with various coupling factors are designed, and the usefulness for very loose coupling is demonstrated. Furthermore, a three-section coupler is designed to show the effectiveness in a wide frequency range. The validity of the design concept and procedure is confirmed by electromagnetic simulations and experiments.