28 GHz Digital SIW Phase Shifter Using Embedded PIN Diodes

This paper presents a new approach for designing of a controllable phase shifter based on integrated substrate waveguide (SIW) technology and PIN diodes for 5G millimeter wave wireless communication applications. The proposed phase shifter operates at 28 GHz with a wide bandwidth (14%) from 26 GHz to 30 GHz. The proposed geometry is designed and optimized by numerical simulation (HFSS) and results show a good agreement and a maximum differential phase of 99.99° at the central frequency (28GHz). The phase difference is provided by metal poles which are switched by PIN diodes and achieved a good performance regarding return loss and insertion loss.