The PE8038 from Pasternack Enterprises Inc is a Limiter with Frequency 11 to 18 GHz, Flat Leakage 0.02 W, Flat Leakage 14 dBm, Peak Flat Leakage 19 dBm, Peak Flat Leakage 0.07 W. Tags: Module with Connectors, PIN-Schottky Diode. More details for PE8038 can be seen below.