Multiwavelength Multiplexing Hologram Designed Using Impedance Metasurfaces

We propose a method to generate microwave holograms using impedance metasurfaces for multiple simultaneous wavelengths. For recent impedance hologram designs in the microwave band, radiation from leaky waves can be controlled in the far field by creating holograms based on the interference of reference and object waves at a specific frequency. In our design, we vary only one physical dimension in the unit cell to simultaneously satisfy the requirement of impedance distribution for two frequencies in the same aperture. Two excitation ports are used to simultaneously generate the beams at 17 and 20 GHz. The simulation and measurement results show a very good agreement, confirming the validity of the proposed design method. The new low-profile holographic leaky-wave antenna has potential applications in designing multifrequency communication and radar systems.