This document presents different phase shifter designs implemented in contactless air-filled substrate-integrated
waveguide (CLAF-SIW) technology. The phase shifters are based on unit cells that avoid leakage losses in the
assembled layers and produce the desired phase shift along the waveguide. The unit cells are represented
by waveguides whose lateral walls have double-mushroom structures, and phase-shifting elements are in
their propagation zone. The proposed phase-shifting elements are integrated cavities, integrated cavities with
patches, and integrated cavities with mushroom-like patches. Transitions are needed to match impedances
between the waveguides loaded with phase-shifting elements and a reference CLAF-SIW. Other transitions are
designed to measure the prototypes, from coplanar waveguide to SIW and SIW to CLAF-SIW. Finally, some
prototypes are manufactured to provide an experimental validation of the proposed phase-shifting elements.
Good agreement is obtained between the simulated and measured results for all the CLAF-SIW phase shifters
in the frequency range between 30 and 50 GHz
