Compact Millimeter-Wave SIW Circuit that Combines Phase-Shifting and Attenuating Functions

In the 5G networks, millimeter-wave (mmW) devices and circuits with compact size and multiple functions are essential for the development of a large-scale wireless system thanks to their high-level integration features. In this work, we propose and demonstrate a mmW band compact device that simultaneously performs the function of phase-shifter and attenuator. The proposed device is based on a folded SIW scheme with coupling aperture and etched slots designed for the concurrent tuning of amplitude and phase. Theoretical and experimental results are given, which confirm the usefulness of the proposed technique.