A design of off centered feed array (OCFA) antenna for ISM band

In this paper, a patch antenna for 2.45 GHz ISM (Industrial Scientific Medical) band Wireless Body Area Network (WBAN) applications is proposed. The antenna structure consists of a microstrip antenna array consist 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 from the OCFA antenna structure. Two matching stub and Circular matching BalUn were introduced to match the impedance of the antenna and contribute high gain antenna about 11.84 dB at 2.45 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 using Vector Network Analyzer (VNA).