RESUMO
The holographic technique is a promising way to manipulate light distribution and wave-front in the optical regime. In recent years, many researchers have extended this concept to microwave regime to manipulate phase, amplitude, and polarization of waves in a convenient way revealing diverse intriguing applications. Unlike the previous studies with optimization-based schemes, in this paper, we propose a simple route to design dual frequency dual-polarization holographic metasurfaces with negligible interference between the operating (lower and upper) frequencies. For this purpose, a Jerusalem-shape unit-cell is used to realize two distinct impedance distributions which yield two decoupled field profiles over the aperture of the metasurface at each frequency band. Consequently, the proposed metasurface radiator can operate in two frequency bands, independently. Each set of horizontal (vertical) cross-bars of the Jerusalem-shape unit-cell is illuminated by a vertical (horizontal) feeding network from one side of the metasurface. Side feeding has a null-free advantage, this undesired null emerges in central feeding metasurfaces and leads to an undesirable rabbit's ears phenomenon. As the proof-of-concept, a prototype of the metasurface radiator for operating at 11.5 GHz and 14 GHz is fabricated and measured. The experimental results depict a good agreement with the full-wave simulations.
