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eddyann

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Posts posted by eddyann

  1. Posted

    The dimensions (in mm)

    Diameter =
    dr reflector 240,
    dv driven 179,
    d1 director 1 154,
    d2 director 2 135,
    d3 director 3 133,
    disc thickness 1 
    boom 5,


    feedpoint from center 65,
    boom length 210,

    Gap =
    dr to dv 15.5
    dv to d1 21
    d1 to d2 88
    d2 to d3 78

    2 people like this

  2. Posted

    The antenna working frequency should be well enough to operate from 898 MHz to 934 MHz which suitable for UHF RFID application. I will share later once the antenna has been constructed and tested with the network analyzer

    rfid1.png

    rfid2.png

    rfid3.png

    rfid4.png

    1 person likes this

  4. Posted

    1 hour ago, Admin said:

    ,,,you work with CST...???

    I'm currently learning to draw and simulate disc antenna using CST software. Still new and learning. I still cannot find the formula to get the feed point / inset feed location. Some said it is about ~1/3 from the V or the radiator

  5. Posted

    44 minutes ago, Admin said:

    ,,,the  feedpoint is chosen relative to the vibrator and not to the reflector...!!!

    ,,,as you can see, this is chosen to ensure a wide frequency band...!!!

    oh ok, so the feedpoint location is it safe to say around ~ 1/3 length location from the center of the V? I still cannot find the correct formula for this. or is it  to be autocalculated in the CST software?

  6. Posted

    On 1/30/2023 at 11:29 PM, Admin said:

    ,,,other dimensions, another wifi-shotgun antenna...

    screenshot_2224.jpg

    screenshot_2225.jpg

    feedpoint (SMA) to the center c=20. is there any standard method on the calculation? most of the time it is about 1/3 to 1/4 from the R=90 in this case