The INA-3644 from Stellant Systems is a RF & Microwave Isolator with Frequency 3.6 to 4.4 GHz, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for INA-3644 can be seen below.