Parabolic reflector fed by Cylindrical Dielectric Resonator Antenna with high gain

Wideband Cylindrical Dielectric Resonator Antenna Operating in HEM11δ Mode with Improved Gain: A Study of Superstrate and Reflector Plane

“…It can be concluded that cavity resonator concept [21] was helpful in improvement of bandwidth and gain up to 16.84% and 6.6 dBi, respectively, in Antenna #2, while for Antenna #3, the reflector plane concept [16][17][18], helped in significant improvement of gain up to 10.02 dBi. Therefore, the prediction of improved gain and wide bandwidth by the combination of superstrate and reflector, that is, Antenna #2 and Antenna #3, cannot be ignored.…”

“…Briefly, the use of periodic frequency selective surfaces (FSS) on superstrate has enhanced the gain up to 11 dBi [7], while the use of loaded patches has been used to enhance the gain up to 12.2 dBi and 7.54 dBi in [14] and [15], respectively, without affecting the mode of operation. Ali et al [16][17][18] and Nikkhah et al [19] have proposed the concept of reflector to improve the directivity and gain by means of reducing the back radiation which are quite valuable for researchers. Though these techniques [8][9][10][11][12] improves the gain, some issues cannot be ignored, like disturbance of Q-factor during stacking of different dielectric layers [8,9], costlier and high precession fabrication/tailoring of complex EBG structures [10], and comparatively large size and weight [11,12].…”

Wideband high gain conical dielectric resonator antenna: An experimental study of superstrate and reflector

“…Nikkhah et al have used reflector as well as array of DR (4 element and 16 element) to improve the gain beyond 10 dBi. Ali and his research group have reported different kind of reflectors to improve the directivity up to 4.5dB, 5.5dB, and 7.5 dB, respectively. Although some of these approaches are effective in gain improvement but sometime deal with some issues, like chances of unnecessary air‐gap during series of stacking, which also needs high precision fabrication, modification of DR may affect the aspect ratio as well as the Q ‐factor, fabrication difficulty during incorporation of EBG and vias, large size, and volume …”

“…However, from above techniques, the superstrate and reflector techniques are quite adept, as they have the potential to improve the radiation characteristics without much affecting DR/substrate geometry and other performances. But the investigations on these techniques are quite limited, which need to be extended further.…”

“…Although some of these approaches are effective in gain improvement but sometime deal with some issues, like chances of unnecessary air-gap during series of stacking, which also needs high precision fabrication, 7,8 modification of DR may affect the aspect ratio as well as the Q-factor, 9 fabrication difficulty during incorporation of EBG and vias, 10 large size, and volume. 11,12 However, from above techniques, 7-21 the superstrate 16,17 and reflector [18][19][20][21] techniques are quite adept, as they have the potential to improve the radiation characteristics without much affecting DR/substrate geometry and other performances. But the investigations on these techniques are quite limited, which need to be extended further.…”