The TH201J /1-2GHz from Sainty-Tech Communications Limited is a RF & Microwave Circulator with Frequency 1 to 2 GHz, Insertion Loss 0.7 dB, Isolation 15 dB, Operating Temperature 0 to 60 Degree C. Tags: Coaxial Circulator. More details for TH201J /1-2GHz can be seen below.