designing a sub-wavelength array to change the direction of the radiation wave to a desired angle using variable huygens surfaces

Since huygens structures with phase shift lead to beam rotation, this manuscript discusses a phase shifter structure for the huygens surface based on tapered slot transition in the frequency range of 9.95-10.2 ghz using varactor diodes. by inducing an electric field along the tracks and placing diodes, the phase can be changed up to 200 degrees. with unit cells of 0.2  -that this size is the smallest possible size for beam rotation structures - and a mega cell of 4 unit cells, incident angles of 0-15 degrees can be converted to transmitted angles of 10-45 degrees. the unit cell has been fabricated and it is shown that the measurement results are in good agreement with the simulation one.