Search

Multimode multibeams are widely investigated, but are mostly generated by 3D bulky configuration or partitioned aperture for each beam. This paper proposes and analyzes a method to generate multimode multibeams using a planar single‐layer metasurface with shared aperture. The underlying principle is multiplexing tensor holographic metasurface with a superposition of modulated impedance surface. The multiplexed metasurface is an interference pattern of objective radiation and reference current to generate each beam. To validate the proposed method, this paper presents a multiplexed metasurface shared for two different beams. These two beams are with different modes, i.e., different beam types, different frequencies, different polarizations, and different focal depths. This multiplexed tensor holographic metasurface is theoretically analyzed, fabricated, and validated with matched results in simulation and measurement. The proposed method is promising to realize multiplexed tensor holographic metasurface for emerging wireless communication and radar front‐ends with compact aperture, low profile, light weight, and multiple functions. [ABSTRACT FROM AUTHOR]

A tensor holographic metasurface is proposed, to independently manipulate nondiffractive beams with orthogonal polarization and flexible propagation direction. To theoretically analyze the proposed topology, addition theory is developed to modulate surface impedance using tensor cells. Moreover, a polynomial formula is derived to express the equivalent surface impedance of tensor unit cells for pattern generation. To validate this concept, a tensor holographic metasurface is designed, fabricated, and measured. The well‐matched simulation and measurement results show that, for the first time, the proposed holographic metasurface with tensor unit‐cells, simultaneously generates two Bessel beams, not only with orthogonal polarization, but also with expected propagation direction rather than fixed along the broadside. Moreover, the proposed topology is promising to manipulate multiple beams not limited to two Bessel beams. [ABSTRACT FROM AUTHOR]

Metasurfaces, orbital angular momenta (OAM), and non-diffractive Bessel beams have been attracting worldwide research. Combining the benefits of these three promising techniques, this paper proposes a metasurface-based reflective-type approach to generate a first-order Bessel beam carrying OAM. To validate this approach, a millimeter-wave metasurface is analyzed, designed, fabricated, and measured. Experimental results agree well with simulation. Moreover, this reflective-type metasurface, generating a Bessel beam with OAM, is inherently integrated with a planar feeding source in the same single-layer printed circuit board. Therefore, the proposed design features low profile, low cost, easy integration with front-end active circuits, and no alignment error between the feeding source and the metasurface. [ABSTRACT FROM AUTHOR]