The WRCD20-1426-1428-1448-1450-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.428 to 1.448 GHz, Bandwidth 20 MHz, Insertion Loss 2.25 to 3.5 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1426-1428-1448-1450-40 can be seen below.