A High Gain Circularly Polarized Dual Band Antenna Array Using Sequential Phase Rotation Technique for Wireless Applications

In this article, a high gain Circularly Polarized (CP) dual band 2 × 2 antenna array using sequential phase rotation technique for wireless applications is designed and investigated. The feed network utilizes four rectangular lines of equal width and three 90° arcs. The length of all elements is equal to λ g /4 to provide 0°, 90°, 180° and 270° phase differences at the four outputs of feed network to increase Axial Ratio (AR) bandwidth and purity. Four corner truncated patch elements are connected to the feed network to complete 2 × 2 antenna array design. The proposed antenna array operates at two different frequency bands of 4.9–6 and 7.9–8.3 GHz (S 11 < −10 dB) and also shows CP behavior at 5–5.8 and 8–8.4 GHz (AR < 3 dB) frequency bands. Very good similarity is attained between the axial ratio and impedance bandwidths. The maximum gain of the antenna array is 9.1 dB. The antenna array was prototyped and tested to validate its performance. This array is well suitable for WLAN, Wi-Fi and X-Band uplink satellite communication applications.