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A novel wideband perforated dielectric reflectarray
Author(s) -
Xi Baokun,
Xue Qianzhong,
Cai Yang,
Wang Yong,
Yang Shaopeng,
Zhang Rui
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31965
Subject(s) - wideband , bandwidth (computing) , materials science , impedance matching , dielectric , electrical impedance , optics , optoelectronics , electronic engineering , acoustics , electrical engineering , engineering , physics , telecommunications
This work proposes a new methodology for widening the bandwidth of a reflectarray (RA) antenna. The narrow impedance of the conventional dielectric RA can be effectively widened on the basis of the gradual impedance matching principle. A multilayer element can realize impedance matching to free space by suitably choosing the different diameters in different layers of the drilled air‐vias. Besides, a series of air‐vias with varying diameters changes the resonance frequencies and partially overlapped bandwidth between one another, which results in widening the bandwidth. To validate the wideband RA antenna design, a circular RA prototype with diameter of 96 mm is simulated, fabricated, and measured. The measured RA exhibits an improved 1‐dB gain bandwidth of 18.4%. A peak gain of 25.18 dBi with maximum aperture efficiency of 52.18% is obtained. The significant experimental performance improvement confirms that bandwidth can be efficiently broadened by introducing the tapered scheme.