American Microwave Corporation offers Model Number BT-50K18 with Options PS, and RES which is a Resistive Bias Tee Designed for 50kHz to 18 GHz Frequency Range. The VSWR is 1.75:1 Typical, and the Insertion Loss is 0.75 Typical while the Isolation is 60 dB Minimum. The Size is 0.80”(L) X 0.62”(W) X 0.40”(H).