The 57Z-3G from JFW Industries is an impedance matching pad which operates between DC and 3 GHz. It matches a 50 Ohm N Type female connector to 75 Ohm N Type male connector. It is also available with BNC, F Type, SMA and TNC Connectors. The 57Z-3G has an attenuation of 5.7 dB with accuracy of 0.5 dB and a VSWR of 1.35:1.