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  1. #1
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    How to simulate the coupling coefficient of a hairpin filter to obtain its separation

    Hi guys,

    using microwave office or ads ,how do i simulate the coupling coefficient of a hairpin filter to obtain its separation.

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  2. #2
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    Re: coupling coefficient

    Hello Danesh,

    Coupling Coefficient using MWO

    First plot the S21 Magnitude in dB & then find the two highest peaks in |S21|.
    The frequency of the first peak (lower frequency) is called F_low.
    The frequency of the second peak (high frequency) is called F_high.

    Then use the output equation to calculate coupling coefficient
    K =
    (F_high^2-F_low^2)/(F_high^2+F_low^2)

    This formula is from the Daniel G. Swanson Jr. article entitled
    "Narrow-Band Microwave Filter Design. IEEE Microwave Magazine.
    http://www.macom.com/TechApps/pdf/Na...esign10_07.pdf
    See the extracted pictures…
    Then finally sweep the spacing between the resonators (S) & plot the coupling coefficient vs Spacing on a graph…

    ---manju---



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