Design of two-element Circularly Polarized Bubbled Antenna for Vehicular Communication

The two-element linear arrays of printed patch antenna in which the single element geometry is bubbled, are presented in this paper. The proposed antenna is Right Hand Circularly Polarized (RHCP) and is designed for Dedicated Short Range Communications (DSRCs) band with a center frequency (f
_r
) of 5.9 GHz. The diagonal slots inside the geometry have been etched for circular polarization. To resonate at 5.9 GHz, the defects on the ground plane have been created. For further improvements in the antenna parameters, an antenna array with a uniform Wilkinson power divider has been designed. The array is designed and analyzed by keeping an inter-element space of 0.25λ and 0.5λ between two elements. The obtained RHCP gain of the antenna and arrays are 5.38, 7.78, and 8.18 dBic respectively. The impedance bandwidth of the antenna and arrays are 120.81, 130.87, and 131.88 MHz with 308.00, 45.66, and 111.04 MHz 3dB axial ratio bandwidth respectively.