The SHX-TH401D from Shanghai Huaxiang Computer Communication Engineering is a RF & Microwave Isolator with Frequency 3.5 to 6.5 GHz, Bandwidth 300 MHz / 600 MHz, Average Power Forward 20 W, Insertion Loss 0.3 to 0.4 dB, Isolation 20 to 23 dB. Tags: Module with Connector, Coaxial Isolator. More details for SHX-TH401D can be seen below.