US Patent 9293801 Power combiner

A power combining apparatus includes an output waveguide section having inner and outer coaxial conductors, wherein an outer surface of the inner conductor and an inner surface of the outer conductor each includes a substantially linear taper, a center waveguide section having an input, an output, and a plurality of antenna elements, the output of the center waveguide section being coupled to the output waveguide section, and an output waveguide section coupled to the output of the center waveguide section. A power combining apparatus includes an output waveguide section having a central longitudinal axis, and inner and outer coaxial conductors configured to maintain a substantially constant characteristic impedance along the central longitudinal axis, a center waveguide section having an input, an output, and a plurality of antenna elements, the output of the center waveguide section being coupled to the output waveguide section, and an input waveguide section coupled to the input of the center waveguide section.