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  1. #1
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    broadband patch antenna at 5.7 GHz?

    trying to make a broadband patch antenna 5.6 to 5.9 Ghz, probably on 62 mil thick FR4 board. I am close, but just can not get the final dimensions to give good VSWR across the whole band. Only getting maybe 6 dB return loss over the band on an E-shaped patch. It is really touchy, and each analysis pass takes a while...I may never converge on the final correct dimensions. (yes, I know it would be easier on a thicker substrate, or lower dielectric constant--like air, but I need it to be "cheap" and very manufacturable for a commercial job)

    Anybody have dimensons on such a beast?

    •   Alt19th September 2011, 13:24

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    Re: broadband patch antenna at 5.7 GHz?

    Any usual patch antenna exhibits resonant behaviour, so it cannot be used (and is not matched) over a wider band. I would try to use a bow-tie shaped antenna on a dielectric support. Or, for very wide bandwidth, there are some UWB antenna designs.
    I do not work in that area but Microwave Journal and Microwaves & RF magazines brought interesting antenna designs over last 3-5 years.



    •   Alt19th September 2011, 22:31

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  3. #3
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    Re: broadband patch antenna at 5.7 GHz?

    Maybe you need more elements. I saw one my colleague designed such antenna with 1024 elements, and got about 20dB return loss.



    •   Alt19th September 2011, 23:03

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  4. #4
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    Re: broadband patch antenna at 5.7 GHz?

    the E shaped patch has 2 resonant frequencies, so you can make a double tuned vswr response.



  5. #5
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    Re: broadband patch antenna at 5.7 GHz?

    Just another idea. U-shape slot antenna can get wide bandwidth.

    http://www.accessengineeringlibrary....6855_ar016.pdf


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