Off centered feed array (OCFA) antenna for WiMax and WLAN applications

In this paper, a design of patch array antenna for WiMAX (Worldwide Interoperability Mobile Access) and WLAN (Wireless Local Area Network) applications is proposed. The antenna structure consists of a microstrip patch array of 3 by 3 OCFA (off centered feed array) that is coaxial feed through type antenna with Unbalanced characteristic whereby the feed line situated off centered λ/3 to the left and 2λ/3 to the right of the OCFA antenna structure. Two short circuit type matching stub and Circular matching BalUn were introduced to match the impedance of the antenna and contribute not only wideband but high gain antenna characteristic about 7.68 dB at 2.443 GHz for WLAN and 5.65dB at 2.311GHz for WiMAX applications. The bandwidth for both applications covers the whole spectrum for WiMax and WLAN application and contributes to the value of 0.211 GHz of bandwidth for frequency starting from 2.267GHz to 2.478 GHz. Then, the entire proposed antennas were being analyzed in term of return loss, Voltage Standing Wave Ratio (VSWR), radiation pattern and gain. The fabricated proposed antenna only analyzed in term of return loss by using Vector Network Analyzer (VNA).