The WH2002A / 19.5-23GHz from Sainty-Tech Communications Limited is a RF & Microwave Circulator with Frequency 19.5 to 23 GHz, Insertion Loss 0.8 dB, Isolation 15 dB, Operating Temperature -55 to 85 Degree C. Tags: Microstrip Circulator. More details for WH2002A / 19.5-23GHz can be seen below.