A power divider/combiner is a device used to route signals. It is available with either resistive or reactive design.

Resistive power dividers are constructed in a star configuration that functions like a RF hub, which is ideal in radio-to-radio RF testing. Radios connected to the RF hub will all Rx each other at the same signal level. 

Reactive power dividers have a fan-in/fan-out layout. Reactive power dividers have less through loss than their resistive counterparts. The reactive design also has isolation (20 dB typical) between the combiner ports.