Quantic PMI Model TD-30T-SHS-218 is a high speed, TTL logic output threshold detector designed to operate from 2 to 18 GHz with a propagation delay of 15 ns maximum; dynamic range up to +10 dBm; and a VSWR of 3.0:1 Max @ -20 dBm. This detectors physical Size is 0.8" x 0.62" x 0.4" with gold plated finish and has SMA female connectors. https://www.quanticpmi.com/product-details/td-30t-shs-218-