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  1. #1
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    how to design Quadrature Hybrid Coupler in HFSS?

    i have some knoladge on microwave engineering and in HFSS and i need to design this coupler to work on 1.67GHz
    i know i need this geometry but i'm not so sure how to decide the width and length of each and every element in this coupler
    Click image for larger version. 

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  2. #2
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    Re: how to design Quadrature Hybrid Coupler in HFSS?

    Hi STINGERX,

    The width of each strip is governed by its characteristic impedance, whereas the length is dictated by the required phase shift. As such, There are only 2 unique elements.

    Good Luck



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  3. #3
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    Re: how to design Quadrature Hybrid Coupler in HFSS?

    if i need to get a coupler with outpot 2 and 3 that are in the same magnitude but with a different phase 90 deg
    how can i design such a coupler?
    also how to calculate the width and length?
    it seem to be like this problem is much more complex



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  4. #4
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    Re: how to design Quadrature Hybrid Coupler in HFSS?

    The image you posted has all the information you need. All you need to do is design the specific lines with your particular physical substrate setup. In case it isn't immediately obvious, this is a microstripline coupler.



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    Re: how to design Quadrature Hybrid Coupler in HFSS?

    Hi Stingerx,

    What are the substrate details ? Based on er and height of the substrate, you can use online microwave calculators to determine the length and width.

    -sv



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  6. #6
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    Re: how to design Quadrature Hybrid Coupler in HFSS?

    the substrate called roger duroid 5880 with a thickness of 1.575mm ant tangent loss of 0.0009 with er=2.2
    where can i find such calculator, also i would like to know the formulas
    also i can't just draw a microstrip that looks like the one in the image, i need more precise messurements



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