Terahertz High-Power Sixteen-Way Power Combiner/Divider Using Combining Circular Waveguide Mode

This study proposes a terahertz (THz) power combiner capable of handling multiple input pathways, employing an E-plane T-junction waveguide-mode converter to achieve the transition from the TE10 mode in a rectangular waveguide to the TE01 mode in a circular waveguide. To investigate its design, an equivalent-circuit model of the power-combining structure is developed, enabling an analysis of its geometric parameters and electrical characteristics. Furthermore, a comprehensive circuit model of the proposed combiner is presented. To verify the proposed design, a sixteen-way THz power combiner was constructed and tested. Simulation outcomes are consistent with experimental measurements. The device exhibits an average insertion loss of 1.6 dB and an input return loss greater than 15 dB over the 143-170 GHz frequency range, with a relative bandwidth of approximately 16%.