구형 도파관 기반의 W-대역 8-Way 방사형 전력 결합기

Abstract

For semiconductor-based W-band high-power generation, a rectangular waveguide-based eight-way power combiner was designed and fabricated, providing broadband low-loss performance. The designed power combiner consists of a four-way mode converter and an H-plane T-junction. The electromagnetic fields were rotated and equally distributed among the four waveguides of the four-way mode converter, which was perpendicular to the input waveguide. Then, the H-plane T-junctions were attached to the output waveguide of the four-way mode converter. The eight output ports were placed symmetrically with respect to the input port so that the amplitude and phase imbalances between the output ports were minimized. The power combiner was made from metal without the dielectric substrate, allowing for easy fabrication and low loss. Each dimension was optimized using three-dimensional electromagnetic simulators. The fabricated eight-way power combiner demonstrated a broadband performance such as an input return loss of less than 10 dB from 75.0 GHz to 98.7 GHz and a low loss of less than 1.0 dB from 76.7 GHz to 95.3 GHz. The minimum loss was measured as 0.6 dB from 78.8 GHz to 81.3 GHz.