The BT-29-400D from Pulsar Microwave is a Bias Tee that operates from 300 MHz to 18 GHz. It can handle a DC voltage of up to 50 V and a current of 500 mA. This bias tee has a low insertion loss and a VSWR of less than 1.61:1. It can handle up to 1 W of RF power and is available in a module with SMA female connectors.