Slot-loading rectangular dielectric resonator elements reflectarray

Design of a Novel Composite Dielectric Metallic Structure Reflectarray

“…However the bandwidth of the dielectric reflectarray is relatively narrow. Papers [6,7] show that the 1-dB bandwidth of the dielectric reflectarrays is only 10% ,13%, and the 1.5-dB bandwidth of the dielectric reflectarray is only 15% in paper [8]. In order to improve the bandwidth of dielectric reflectarray, a hybrid structure reflectarray with dielectric and metal is designed in this paper.…”

Reflectarray antenna for X-band applications

“…Thus, dielectric resonators could be a better candidate than microstrip patches for reflectarray applications. Separate dielectric resonators or dielectric resonators combined with printed patches were introduced as alternative element for reflectarray antennas [7][8][9][10][11]. Keller et al [7] introduced a variable length DRA as an element for a reflectarray at 30 GHz.…”

“…However, it has multilayer structure and complex design. Abd-Elhady et al [9] showed that a slotloaded rectangular dielectric resonator could provide 13% improvement in the operating bandwidth. Further enhancement was introduced by the same authors in [10] to achieve an 18% improvement in the operating bandwidth.…”

Dra Reflectarray Unit Elements With Thin Under-Loading Parallel Slots

“…Cutting the super-hard dielectric resonators into different sizes is always very tough. Etching slots onto the ground surface beneath a DRA unit element was also demonstrated to be a possible way to introduce reflection phase shift to an incoming wave [10,11]. However for both cases, very little design freedom is available as slot width is the only parameter to tune.…”