Scattering and reflection of a quasi-periodic unit cell sequence for reflectarray and holographic applications

Scattering and reflection characteristics of quasi-periodic uni-cell combinations are investigated. The unit cells consist of a width-modulated microstrip line laying on a single layer grounded dielectric, where the modulation inside the unit cells is individually controllable. A sequential positioning of unit cells with different modulation parameters results in a quasi-periodic arrangement, allowing the control of the phase and scattering of fields from the resulting metasurface. A normally incident plane wave excitation is considered and results for different single unit cells and their quasi-periodic arrangements are presented. The possibility of effective control of the reflection phase with the order of sequence of the single unit cells is demonstrated. From application point of view, the analytic expression for the dispersion characteristics of single unit cells reduces the design time for large surfaces, such as as holographic planes and reflectarrays.