Design and implementation of SIW based multiple output X-band phase shifters

In this paper, 1 × 2 Y-type and 1 × 4 cascaded SIW power divider based phase shifters are presented at X-band. The proposed phase shifters consist of a SIW section with rows of metallic posts used for phase shifting are inserted at the output ports. The proper phase shifting in this configuration is achieved by changing the diameter and position of these metallic posts. There is a shift in the region of operation of the phase shifter as the diameter and the position of the via changes. The proposed geometry is designed and optimized by numerical simulations (HFSS) and fabricated prototype is validated through experiments. Simulated and measured results of proposed structures are in good agreement. For two output phase shifter consecutive ports have the phase shift of 152° and for four output of 40° are achieved. The S11 is below −15 dB over the frequency band of 9.5 to 11.4 GHz with the percentage bandwidth of 17% is obtained.