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fmoney said:Hi KYG,
i'm happy to help you, but what exactly you want to know about farfield?
About directivity and efficency, i tell you that high values of directivity suggest a good performance of the antenna, but it depends on the type of antenna. The same thing it can say about efficency: the performance of the antenna is good when the value is close to 1. Put attention on the efficency if you use materials without loss, because it's possible that efficency is plus than 1.
Good bye and good luck! And if you want other help i'm happy to satisy you!And sorry for my very bad english!