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plz help me with FSPL

时间:04-07 整理:3721RD 点击:
hi all.,
as my lecturer said , the equation to calculate free space path loss is L = (4piD/lambda)^2.
but the the loss values calculated using this equation comes around +200dBs. it is a big loss.
in text books, i have seen the same equation and the reciprocal of this as well. ie (lambda/4piD)^2

i'm confused..please tel me which one is the correct one..plz..

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