The ESL6018A2 from Eclipse MDI is a Limiter with Frequency 6.0 to 18 GHz, CW Flat Leakage 15 dBm, CW Flat Leakage 0.03 W, Peak Flat Leakage 19 dBm, Peak Flat Leakage 0.07 W. Tags: Module with Connectors, PIN-Schottky Diode. More details for ESL6018A2 can be seen below.