A transmit/receive module to selectively transmit a high-power microwave signal to one of first and second output paths (22', 24') and to selectively receive through one of the first and second output paths, the module comprising: a variable phase shifter to provide a lower-power microwave signal; a first switch connected to the phase shifter; a first ninety-degree coupler connected to the switch for directing power from the switch to first and second output ports of the first ninety-degree coupler; a second switch connected to a first output of the first coupler; first and second amplifiers (34', 35') connected to the second switch, the first amplifier being input coupled to the second switch and the second amplifier being output coupled to the second switch; a first circulator connected to an output of the first amplifier and an input of the second amplifier; a third switch connected to a second output of the first coupler; third and fourth amplifiers (36', 37') connected to the third switch, the third amplifier being input coupled to the third switch and the fourth amplifier being output coupled to the third switch; a second circulator connected to an output of the third amplifier and an input of the fourth amplifier; and a second ninety-degree coupler having two ports coupled to the first and second circulators and having another two ports to provide the first and second output paths,- wherein the first switch is configured to selectively couple the lower-power microwave signal between first and second input ports of the first ninety-degree coupler, and wherein when the first switch couples the lower-power microwave signal to a selected one of the input ports of the first ninety-degree coupler, signals generated by the first and third amplifiers are combined in the second ninety-degree coupler to provide a high-power microwave output signal on only one of the output paths. a variable phase shifter to provide a lower-power microwave signal; a first switch connected to the phase shifter; a first ninety-degree coupler connected to the switch for directing power from the switch to first and second output ports of the first ninety-degree coupler; a second switch connected to a first output of the first coupler; first and second amplifiers (34', 35') connected to the second switch, the first amplifier being input coupled to the second switch and the second amplifier being output coupled to the second switch; a first circulator connected to an output of the first amplifier and an input of the second amplifier; a third switch connected to a second output of the first coupler; third and fourth amplifiers (36', 37') connected to the third switch, the third amplifier being input coupled to the third switch and the fourth amplifier being output coupled to the third switch; a second circulator connected to an output of the third amplifier and an input of the fourth amplifier; and a second ninety-degree coupler having two ports coupled to the first and second circulators and having another two ports to provide the first and second output paths,- wherein the first switch is configured to selectively couple the lower-power microwave signal between first and second input ports of the first ninety-degree coupler, and wherein when the first switch couples the lower-power microwave signal to a selected one of the input ports of the first ninety-degree coupler, signals generated by the first and third amplifiers are combined in the second ninety-degree coupler to provide a high-power microwave output signal on only one of the output paths.