  In this brief, we present a low-loss mechanically reconfigurable phase
shifter implemented in gap-waveguide technology for mm-wave frequencies. The
proposed design gives a practical implementation of tuning elements inside the
waveguide providing alternatives to the use of the E-plane split waveguide at
high frequencies in order to avoid leakage losses. The depicted phase shifter
design is based on a H-plane split waveguide. The phase shift is controlled by
means of a tuning screw, which exerts pressure on a flexible metallic strip
inserted inside the waveguide. The flexible strip bends with different
curvature radii and determines the phase shift at the output port.
Cost-effective manufacturing and simple implementation of the flexible metallic
strip are achieved by means of the gap-waveguide design. A prototype has been
manufactured for validation purposes. Good impedance matching is achieved from
64 GHz to 75 GHz providing a 15.8% impedance bandwidth. The results show a
maximum phase shift of 250$^{o}$ with a maximum and mean insertion loss (IL) of
3 dB and 1.7 dB, respectively.
