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  1. #1
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    How To Extract PCB RFID Antenna Circuit model Using CST

    Dears;
    how i can extract SPICE Model For This attached Antenna Using CST Tool i can feed the antenna and do Frequency Analysis and drow the Far Filed Pattern if there any post calculation to Extract Circuit model For this antenna or Calculate it's input impedance.
    it is RFID Antenna work @ 13.56MHz

    Click image for larger version. 

Name:	anttena.JPG 
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Size:	48.0 KB 
ID:	75827

    •   Alt14th June 2012, 17:07

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  2. #2
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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    I'm not using CST for 13.56 MHz RFID coils analysis, some general comments nevertheless.

    13.56 RFID is essentially a near field problem. The radiation impedance part of the coil's real impedance can be usually neglected, the far field is mainly interesting as an unwanted EMI.

    The coil or "antenna" impedance can be derived by an AC magnetics analysis, without considering EM phenomena (coupling of a electrical and magnetical field).

    The real part impedance is mainly representing coil resistance, skin effect and eddy currents.



    •   Alt14th June 2012, 20:43

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  3. #3
    volker_muehlhaus
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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    Quote Originally Posted by emamss View Post
    Calculate it's input impedance.
    CST calculates the input return loss (S11) . This contains the input impedance information. I am not a CST user, but other EM simulators aloow you to plot the real / imag part of the input impedance (Zin) also. This data/plot should be available in CST as well.


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    •   Alt15th June 2012, 10:14

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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    Of course, S11 contains all necessary information. As said, the real part will mainly represent conductor losses. So you should take care, that the simulation parameters will allow a sufficient accuracy of current distribution modelling.



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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    Hi, actually i have seen ur antenna! can u plz send me details of antenna that u have designed? means any pdf or doc file that contains the description?



    •   Alt15th June 2012, 18:48

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  6. #6
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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    Dear i attached the antena matching circuit and its PCB coil
    i will try to upload sct file later
    fClick image for larger version. 

Name:	anttena.JPG 
Views:	28 
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ID:	76057

    - - - Updated - - -

    you can download CST file from this link
    http://www.4shared.com/file/fNszCwUq/RFID_R_2.html?


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    Re: How To Extract PCB RFID Antenna Circuit model Using CST

    The rigid-flex pcb prototypes is the most famous and popular electronics product which we needed for the making pcb. We used lot of electronic product at home and office were the rigid-flex pcb are used.



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