An Ultra-Wideband High Combining Efficiency Power Combining Network on SISL Platform

An ultra-wideband 8-way power combining network based on the spatial interconnected structure of substrate integrated suspended line (SISL) is designed for the first time in this paper. Multiple ultra-wideband low-loss Wilkinson power dividers based on the SISL platform are used, and the spatial inter-connection structure is designed to reduce the area of the planar circuit based on the highly integrated characteristic of SISL. The overall circuit layout is compact and easy to integrate with other modules. An ultra-wideband 8-way power combining network is implemented and measured. From 0.5 to 4 GHz, the maximum output power at 1-dB compression point is 29.9 dBm, the power combining efficiency is 71%-91% and reaches a maximum of 91% at 0.5 GHz.