Ku-band Reflectarray Antenna Using Cross-shape element Attached with Circular-Delay Lines

In this paper, a reflectarray antenna consists of an offset-fed is designed for Ku-band applications. The unit cell comprises of modified cross-shaped element along with quad-circular delay-lines. The dimensions of delay-lines are varied to obtain the broad phase range. A low-cost FR-4 laminate is used to design the reflectarray unit cell with
$0.45\lambda_{\mathrm{o}}$
periodicity. The far-field radiation characteristics are obtained by simulating a
$15\times 15$
reflectarray while keeping the
$\mathrm{F}/\mathrm{D}=1$
. A gain of 28 dBi is achieved for
$E$
and
$H$
-planes.