Triple-band circular polarized antenna for wlan/wi-fi/bluetooth/wimax applications

Abstract

—A planar geometry triple-band circularly polarized (CP) antenna is proposed for wireless applications. The antenna consists of rectangular strips on the upper surface along with rectangular slots on the ground plane. The 3 dB axial-ratio of the antenna is achieved through a reformed ground plane. Through the aid of these features, a small, compact wideband circularly polarized antenna is fabricated with an area of 25 × 25 × 1.02 mm3. The −10 dB impedance bandwidth of the proposed antenna is 8.2% (2.4–2.58 GHz), 33% (3.2–3.9 GHz), and 41.1% (5.2–7.8 GHz). While the 3 dB axial ratio bandwidth achieved by the proposed antenna is 89.7% (2.17–5.8 GHz). The designed antenna is suitable for wireless applications such as WiMAX, WLAN, ISM, Bluetooth, and Wi-Fi.