The SHX-TH301A from Shanghai Huaxiang Computer Communication Engineering is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Bandwidth 2000 MHz, Average Power Forward 30 W, Insertion Loss 0.6 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for SHX-TH301A can be seen below.