The BT-0050 from Marki Microwave is a bias tee that operates from 4 KHz to 50 GHz. It has an insertion loss of 1.8 dB and an isolation of 30 dB. It has a 0.5 A current rating and 30 V DC voltage rating. The bias tee can handle up to 1 W of power and is suitable for biasing amplifiers, lasers, and modulators driven with high frequency data patterns.