Compact, Wideband, Circularly Polarized, Inductive Grid-Array Metasurface Antenna

Abstract

A compact, wideband, circularly polarized (CP) dipole antenna is presented. The antenna consists of a directly driven, crossed Egyptian axe dipole (EAD) antenna stacked seamlessly in parallel with an inductive parasitic grid array metasurface within a circular package. The grid array structure is introduced to collaborate with the EAD antenna in producing overlapping resonances to achieve wideband CP radiation. The simulated impedance bandwidth, where |S11|< –10 dB, is from 1.58 to 2.06 GHz (26.3%). The 3-dB AR bandwidth is from 1.67 to 2.08 GHz (21.8%). The consequent overlapping bandwidth is from 1.67 to 2.06 GHz (20.9%). The total dimensions of this very compact, low profile antenna are $\pi {} \times {}{\left({0.19{{{\lambda }}_0}}\right)^2} \times {}0.0014{{{\lambda }}_0} = {}1.59{} \times {}{10^{ - 4}}{{{\lambda }}_0}^3$, where λ0 is the wavelength of the lower bound frequency, 1.67 GHz. Moreover, the antenna radiates bidirectional electromagnetic fields with high radiation efficiency across the entire overlapping bandwidth.