The QEQ18-40-4 from Qualink Microwave is a Gain Equalizer with Frequency 18 to 40 GHz, Gain Equalization 4 dB, Insertion Loss 1.8 dB, Impedance 50 Ohms. Tags: Module with Connectors, Positive Gain Slope. More details for QEQ18-40-4 can be seen below.