The DD-20-23 from Quantic PMI (Planar Monolithics) is a RF Detector with Frequency 2.5 to 3.5 GHz, Max Input Power 3 W, Detected Voltage 31 to 220 mV, Insertion Loss 0.43 to 0.5 dB, Directivity 20 dB. Tags: Module with Connectors, Directional Detector. More details for DD-20-23 can be seen below.
