The TH601K / 4-8GHz from Sainty-Tech Communications Limited is a RF & Microwave Circulator with Frequency 4 to 8 GHz, Insertion Loss 0.6 dB, Isolation 18 dB, Operating Temperature -30 to 70 Degree C. Tags: Coaxial Circulator. More details for TH601K / 4-8GHz can be seen below.