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Development of an ultra‐wide band and low cross‐polarization reflectarray antenna using novel unit cells with wide‐range linear phase
Author(s) -
Ebrahimpour Saraydar Pouya,
Kazemi Robab,
Fathy Aly E.
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22670
Subject(s) - optics , linear phase , bandwidth (computing) , polarization (electrochemistry) , group delay and phase delay , aperture (computer memory) , phase (matter) , linear polarization , radiation pattern , physics , materials science , antenna (radio) , engineering , acoustics , telecommunications , chemistry , quantum mechanics , laser
In this paper, a design procedure for a linearly polarized ultra‐wide band (UWB) single layer reflectarray antenna (RA) is presented. The RA is comprised of novel unit cells of annular ring patches; each ring is connected to two phase delay lines to achieve a linear and smooth phase response over a wide frequency range. In the proposed RA, the designed true phase delay provides more than three cycles of 360°. By adjusting the length of these phase delay lines, a wide range of 1300° linear phase variation has been obtained over a wide frequency band. A wide bandwidth and low cross‐polarization (XP) levels were predicted using the utilized novel unit cell element and the elegant mirrored arrangement. To validate the simulated results, a prototype of circular aperture with 22.86 cm diameter was fabricated and its radiation patterns were measured. The measured 3‐dB gain bandwidth of the RA is 40%, and its maximum gain, aperture efficiency and XP levels are 19.3 dB, 69% and − 35 dB, respectively, which are in good agreement with simulation.