UWB Circularly Polarized Slot Antenna for Multiple Communication Systems

This paper presents a novel broadband circularly polarized antenna (CPA) for multiple communication systems. The proposed antenna achieves a wideband characteristic with the help of a modified ground plane with a circle loop feeding structure. The circle loop feeding structure is used to achieve circular polarization. Additionally, circular slot ground is modified by loading a four-truncated corner and incorporating the I-shaped strip as perturbation elements. In order to validate the performance of the antenna design, an antenna prototype is printed, manufactured, and tested. The proposed antenna is compact with a small size of 40 mm × 40 mm × 1.6 mm. The antenna has a good impedance matching over a frequency band of 1.9 to 9 GHz, with an axial ratio below 3 dB in the bands 3.03-3.09 GHz, 4.8-4.9 GHz and 5.6-5.91 GHz. The simulated realized gain is 5.1 dB at 5.8 GHz and 2.25 dB at 2.2 GHz. The measured results show that the proposed antenna is a good candidate for portable UWB applications.