Quantic PMI Model No. LM-20M20G-18-20WP-5W-MAH is a Limiter with a frequency range of 20 MHz to 20.0 GHz. This unit has an insertion loss of 1.55 dB, a VSWR of 1.9:1, an input power of 5 W, and a recovery time of 25 ns. It has SMA female connectors, and the housing size is 0.50" x 0.50" x 0.22".   https://www.pmi-rf.com/product-details/lm-20m20g-18-20wp-5w-mah