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RF Isolator is a two port device used in RF circuits to get a good isolation for reflected waves back to the input port. Isolators are basically modified version of circulator.

S-parameters are mathematical representation of energy propagation within a multiport electrical network. It is written as a complex matrix file also knows as scattering parameters. S-parameter file represents full combination of the reflection and transmission parameters in a multiport network with frequency component. It gives an idea of how the DUT behaves with a signal in both forward and reverse direction.