Hassan  Hamed Naji, Adheed  Hasan Sallomi, Yousif  Mohsin Hasan, 
    Bi-Layer, Broad-Band, Sub-Wavelength Reflectarray,
    Journal of Engineering and Applied Sciences,
    Volume 13,Issue 20,
    2018,
    Pages 8662-8665,
    ISSN 1816-949x,
    jeasci.2018.8662.8665,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2018.8662.8665)
    Abstract: This study investigates the role of variable sized microstrip patch elements with a double layer substrate to reduce dielectric loss, antenna weight and system cost. Simulation results show that the phase range reaches 700° at C-band with a reflection loss does not exceed 2 dBs Which effectively proves the reflectarrays in this type of application. Circular patch loaded with W-slot is used as a primitive cell for the lower layer at 6 GHz while a λ/4 side length heptagon at 5.5 GHz is molded within the upper layer. Building and testing the designed reflectarray concurs the simulation results.
    Keywords: Broadband;sub-wavelength;reflectarray;C-band;wide-phase-range;W-slot