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    How to increase printed meandered dipole antenna bandwidth

    Hi guys,

    I am new in antenna design and I need help to increase the bandwidth of my printed meandered dipole antenna. the current bandwidth of this antenna is just only 13MHz and i wish to increase it to 500MHz. Can someone please give me some ideas on how to increase the bandwidth?
    I am using FR4 substrate with Er 4.7.

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    thanks in advance!

    p.s. i am really new to this

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    Re: How to increase printed meandered dipole antenna bandwidth

    What is your antenna central frequency?
    Google for "wideband fr4 dipole" images, there are many papers with similar configuration.
    For very wide bandwidth use another topology, for example magnetoelectric dipole.



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    Re: How to increase printed meandered dipole antenna bandwidth

    According to antenna theory, there's an upper limit for the achievable bandwidth of an electrical small antenna. It's unlikely that you can increase the bandwidth of a meandered dipole without making it larger or add intentional losses.



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  4. #4
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    Re: How to increase printed meandered dipole antenna bandwidth

    Quote Originally Posted by Georgy.Moshkin View Post
    What is your antenna central frequency?
    Google for "wideband fr4 dipole" images, there are many papers with similar configuration.
    For very wide bandwidth use another topology, for example magnetoelectric dipole.
    thanks for the reply! i plan to make it fc=750MHz so that its range is from 500MHz to 1GHz

    - - - Updated - - -

    so you mean if i increase the antenna size, i will be likely go get a larger bandwidth?

    - - - Updated - - -

    Quote Originally Posted by FvM View Post
    According to antenna theory, there's an upper limit for the achievable bandwidth of an electrical small antenna. It's unlikely that you can increase the bandwidth of a meandered dipole without making it larger or add intentional losses.
    so you mean if i increase the antenna size, i will be likely go get a larger bandwidth?



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    Re: How to increase printed meandered dipole antenna bandwidth

    There is not much to do to increase the BW of this antenna type (printed meandered dipole). Its BW is about 7% of central frequency (for 2:1 VSWR). Depending of the dielectric material and its thickness.
    Changing the antenna size it will change only the resonant frequency, but not the % of the bandwidth.



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    Re: How to increase printed meandered dipole antenna bandwidth

    Get rid of the meander. Changing the antenna geometry to regular straight dipole will surely increase the bandwidth, but not up to 2:1.



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    Re: How to increase printed meandered dipole antenna bandwidth

    Quote Originally Posted by FvM View Post
    Get rid of the meander. Changing the antenna geometry to regular straight dipole will surely increase the bandwidth, but not up to 2:1.
    i wish i could hahaha... i was given a specific antenna for my project. so yeah.. that's sad.



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    Re: How to increase printed meandered dipole antenna bandwidth

    Quote Originally Posted by vfone View Post
    There is not much to do to increase the BW of this antenna type (printed meandered dipole). Its BW is about 7% of central frequency (for 2:1 VSWR). Depending of the dielectric material and its thickness.
    Changing the antenna size it will change only the resonant frequency, but not the % of the bandwidth.
    hmm...any idea where can i find the proof to support this claim when i tell my lecturer about this?



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    Re: How to increase printed meandered dipole antenna bandwidth

    Quote Originally Posted by kpy View Post
    i was given a specific antenna for my project. so yeah..
    Send your supervisor back to school



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