A high-powered, solid state microwave and millimeter wave, power combiner and divider is provided by using a plurality of radially oriented tapered slotline cards disposed in a center cylindrical coaxial section between its inner and outer conductors. The cylindrical coaxial section in turn is coupled to a conical input coaxial section that couples and distributes the input signal among the plurality of cards, and an output coaxial section that combines the output signal from the plurality of cards to an output coaxial terminal. The device is compact with broadband performance and provides a natural heat sink for a plurality of lower powered devices, which enables the power combiner to use a large number of lower powered devices to meet larger power requirements.