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need help in UHF near-field loop antenna

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hi

I'm using the CST MWS to simulate the UHF RFID near-field loop antenna, and i modelized the antenna as following. But i don't know what size of the loop is suitable? How can i get the right geometry of this loop?
attachment.php


For this kind of antenna, i used "discrete port" as the excitation. The H-field is monitored as following.
attachment.php


Any suggestion to improve the performance of this loop antenna???

Thanks in advance!

FC
 

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  • loop_prototype.jpg
    loop_prototype.jpg
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  • h-field.jpg
    h-field.jpg
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