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Isolators, Noise Figure

Question asked by iyama on May 18, 2010
Latest reply on Jun 30, 2010 by tabbott
In first place, excuse my english...
I have some doubts, and maybe someone can help me.
In a superheterodyne receiver design, we used an isolator between each of the blocks of the system. I want to make a Noise Figure analysis by  Spectrasys Simulation from mixer and for our intermediate frequency (3100Mhz). The graphic shows sharp fall and rise in Noise Figure (in the area of + - 70dB ), successively in each isolator. In the analysis of NF before the mixer  we have not this problem.

Does this have Any clear explanation?