Infinite reflectarrays in the X-band frequency range has been designed, and various slot configurations have been proposed to optimize the design of reconfigurable reflectarray antennas in the X-band frequency range. It has been demonstrated that the introduction of slots in the patch element causes a decrease in the maximum surface current density (J) and electric field intensity (E) and hence causes a variation in the resonance frequency of the reflectarray. Waveguide simulator technique has been used to represent infinite reflectarrays with a two patch unit cell element. Scattering parameter measurements of infinite reflectarrays have been carried out using vector network analyzer and a change in resonant frequency from 10 GHz to 8.3 GHz has been shown for a slot width of 0.5W (W is the width of patch element) as compared to patch element without slot. Furthermore a maximum attainable dynamic phase range of 314°has been achieved by using slots in the patch element constructed on 0.508 mm thick substrate with a maximum surface current density (J) of 113A/m and Electrical field intensity (E) of 14 kV/m for 0.5W slot in the patch element.
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