Isolation between RF in/out ports in off mode

Hello,

I am looking for a LNA-Die working from 20 GHz to 24 GHz. actually, i prefer to find a unmatched one although i found all of the productes matched.

anyway, my  question is here that when the LNAs such as HMC342 are OFF, without biasing, how much isolation between the in/out port we can have ?

 

best regards

ahmad