Switch Amp​​​​ 

One of many potential designs, Teledyne RF & Microwave's switched amplifier covers 100 to 2000 MHz, providing 18 dB gain, phase matched to within ±1.0 degree.

The primary RF input and a secondary calibration signal input are switched, then amplified, and split to two outputs. Gain balance between any of the two outputs is ± 0.5 dB. Output power at 1 dB compression is +14 dBm and input/output VSWR is 2.0:1 maximum.