Abstract: This invention allows the combination of any M of N signal inputs, combines the signals inputs in phase, and does not require switches to terminate unused inputs.Microstrip switching means provide an array of N quarter-wave tuners and an associated single, common, quarter-wave tuner that are interconnected by N semiconductor switching means. Each of the N semiconductor switches is connected with one of the N quarter-wave tuners and is operable to provide a low impedance between its connected quarter-wave tuner and the single common quarter-wave tuner.Microstrip connecting means for the microstrip switching means forms an array of N transmission lines N associated quarter-wave transformers for semiconductor switch biasing and a single transmission line.