High Efficient Millimeter Wave Rectangular Cavity Power Combiner/Divider

This work reports a highly efficient millimeter waves power combiner/divider using rectangular cavity with two coaxial ports as input and a rectangular waveguide port as output. Input ports (with different electrical-lengths) are implemented to excite the rectangular cavity. A septum is placed in the middle of the cavity to achieve isolation. It operates at frequency ranges 38.4 to 40.2 GHz with 15dB return loss at ports and 20dB isolation between input ports, and insertion loss of 3.1dB. Combining efficiency is estimated about 97 percent. The power combiner performance demonstrates that it has the potential to implement in the upcoming millimeter-wave transmitters.