The TH201FS Series from Sainty-Tech Communications Limited is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Bandwidth 10%, Insertion Loss 0.8 dB, Isolation 46 dB, Operating Temperature -30 to 70 Degree C. Tags: Coaxial Circulator. More details for TH201FS Series can be seen below.