The CSM 3818 from Microphase Corporation is a RF Detector with Bias Current 150 µA, Frequency 8 to 18 GHz, Max Input Power 20 to 26 dBm, Frequency Flatness ±0.5 dB, Voltage Sensitivity 1800 mV/mW. Tags: Connectorized, Diode Detector. More details for CSM 3818 can be seen below.
