Principles of Ideal Wideband Reflectarray Antennas

Abstract

Abstract-The principles of ideal wideband Rflecarray Antennas (RAAs) are determined through the idea of distortion-less radiation of a modulated pulse. Two conditions for the cells and one condition for the location of the feed are obtained. The conditions are discussed and clarified by some examples. Each cell requires its own phase at center frequency and its own phase derivative in the desired bandwidth. Some relations are obtained and discussed for the range of required phase derivative of the cells.

Multimode OAM beam generation through 1-bit programmable metasurface antenna

“…The metasurfaces are two-dimensional equivalence of a metamaterials which attracting more and more attention within both science and engineering communities, due to its effective and intriguing applications such as scattering reduction 21 – 23 , reflectarray and transmitarray antenna 24 – 26 , Intelligent surface 27 , 28 , invisibility clocking 29 , 30 , and polarization conversion 31 . Also, the metasurfaces ability to manipulate electromagnetic waves can be used to produce vortex beams in both radio and optics frequency.…”

Phase‐only synthesis of planar arrays using autocorrelation matching method

“…[4][5][6] In these antennas, the amplitude of unit cells is specified by the key parameter F/D. [4][5][6] Hence, we have to synthesize many planar arrays by changing only the phase of their antennas. This procedure of array synthesis is called phase-only synthesis.…”

“…However, in some planar arrays such as reflectarray antennas having either pencil‐beams or contoured beam, only the phase of the unit cells is under our control . In these antennas, the amplitude of unit cells is specified by the key parameter F/D . Hence, we have to synthesize many planar arrays by changing only the phase of their antennas.…”