Abstract
A two dimensional photonic crystal (PC) based antenna is presented that radiates a `circular polarization' (CP) directive pencil beam at broadside with low side-lobe levels, at millimeter. This is owing to the PCs a closed band gap at the center of the Brillouin zone. The PC consists of air columns in a low permittivity grounded substrate. This PC based antenna is corner excited from the backside using a coaxial cable and generates a broadside pencil beam with a maximum gain of <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">~</sub> 18 dBi. The antenna exhibits an good impedance bandwidth, and is overall well suited for millimeter-wave applications such as emerging 5G and IoT that require reliable directive CP beaming.
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