Compensating for non-uniform phase distribution in a spatial power combiner formed by hard horns and trays of uniplanar quasi-yagi antennas

The application of broadband quasi-Yagi antennas as receiving and transmitting antenna elements for a tray-type spatial power combiner was discussed. Strategies of providing uniform field magnitude and phase compensation across the stack of trays were implemented. A passive structure of an X-band spatial power combiner consisting of seven trays of planar quasi-Yagi antennas connected back-to-back was considered for inclusion of active stages. The implementation of phase compensation using Schiffman phase shifters helped to reduce insertion losses and increased operational bandwidth of the tray-type power combiner over its straight through counterpart