The QA44 from Qualwave is a In Series RF Adapter with Frequency DC to 6 GHz, Contact Resistance 1 mOhms (Outer) / 1 mOhms (Center), Insertion Loss 0.1 dB, Mating Cycles 500 Cycles, Temperature -45 to 85 Degree C / -45 to 125 Degree C. More details for QA44 can be seen below.