Quantic PMI model LM-10M18G-16-20W-AL-OPT418-SMM is a coaxial limiter with an operating range of 4.0 to 18.0 GHz. This model has a maximum insertion loss of 2.5 dB at -10 dBm input power with a VSWR of 2.0:1 Max. This compact unit measures 0.90" x 0.38" square and has SMA connectors.