The TH501H / 3-6GHz from Sainty-Tech Communications Limited is a RF & Microwave Circulator with Frequency 3 to 6 GHz, Insertion Loss 0.6 dB, Isolation 16 dB, Operating Temperature -30 to 70 Degree C. Tags: Coaxial Circulator. More details for TH501H / 3-6GHz can be seen below.