Broadband Reflectarray Antenna Using Subwavelength Elements Based on Double Square Meander-Line Rings

Circularly polarized low-cost wide band reflectarray antenna constructed with subwavelength elements

“…It is printed on the 1.6 mm grounded substrate with the relative dielectric constant ɛ r = 2.65 and the tan δ = 0.001. For the sake of achieving the smooth phase variations to design the RA antenna with better radiation performance, the unit cell is tend to be minimized as possible . Nevertheless, the undue narrow gap between adjacent elements will introduce phase errors.…”

Design and Simulation of a Reflectarray Antenna using New Cell for Different Beam Angles

“…Next, the field received on the antenna surface from the feed should be determined and lastly, the compensating phase of each element should be calculated to have a beam in a desired direction. After these four steps and choosing the length of each element, the antenna is designed and its gain can be calculated by 2 …”

“…The reflection phase from the reflectarray elements are designed so that the reflected energy from the array is collimated to form a main beam in a given direction or to generate a shaped beam in the coverage area. The phase of the reflected field can be changed by varying the size of the resonating patches [1,2], by a transmission line of proper length connected [3,4] or aperture-coupled to the patches [5][6][7], or adding active elements to the antenna [8][9][10][11] like MEMs-based structures [12], varactor loaded patches [13,14], PIN diodes [15][16][17][18][19][20][21] or liquid crystal based structures [22].…”

A wideband reflectarray antenna using single‐layer dipole element attached with T‐shaped stubs

“…For moderate‐sized reflectarrays, insufficient element bandwidth plays a dominant role in the narrowband operation of reflectarrays . Therefore, substantial researches have been conducted to enhance the element bandwidth, such as using multiresonant elements, phi‐shaped coupled elements, rings/split rings attached with phase delay lines, and subwavelength grids . However, some of above‐mentioned designs are still in need of an extra air layer for a broadband operation and this would increase the manufacture complexity.…”