Printed reflectarrays combine certain advantages of reflector antennas and phased arrays. One major hurdle in the designing of reflectarrays is the compensation of phase difference between various elements. This paper presents reviews of various techniques for phase compensation, like using variable sizes of the patch, adding stubs of variable lengths and use of variable size slots on the groun...

The ability of the reflectarray antenna (RA) to perform orbital angular momentum (OAM) beam-steering with low divergence angles at fifth generation (5G) millimetre-wave (mmWave) bands is demonstrated. To provide steered OAM beams, it necessary regulate scatterer's geometries smoothly throughout focal area follow required twisted distribution. traditional numerical method compensate for phase mo...

For the first time, a millimeter-wave dual-polarized dielectric resonator (DR) reflectarray fabricated by three-dimensional (3D) printing with high relative permittivity materials is presented. The unit cell of composed two elliptical DRs orthogonally placed in center. A base layer slab at bottom for fixture and connection its adjacent elements. each polarization, only length long axis one DR v...

Dynamic modification of the pattern a reflector antenna system traditionally requires an array feeds. This paper presents alternative approach in which scattering from fraction around rim is passively modified using, for example, electronically-reconfigurable reflectarray. facilitates flexible sidelobe modification, including canceling, systems employing single feed. Applications such include r...

The papers in this special section bring together the antenna community to present state-of-the-art research conducted field and highlight emerging technologies addressing Earth planetary science instrumentation. These aim some examples of latest advances technology for science. Among these topologies, a particular emphasis should be given metasurface type antennas. A can considered 2-D surface...