Printed Antenna Array with Flat-Top Radiation Pattern

Abstract

printed antenna array consisting of 10 wide-band symmetrical pentagonal dipoles is presented. The feed network of impedance transformers is employed to provide appropriate amplitude and phase distribution necessary to obtain flat top beam pattern. The measured results demonstrate excellent radiation characteristics including 38 degrees flat gain region with maximum ripple of 3.5 dB at the centre frequency. Furthermore, the proposed antenna that is placed in corner reflector with angle of 60 degrees has good gain (17 dBi) and side lobe suppression (18.9 dB). Although it is designed at the centre frequency f(c) = 12 GHz, it was shown to be capable of shaping a good flat top radiation pattern within a fractional bandwidth at least 6% of centre frequency. Also, proposed antenna features cheap, simple and easy fabrication that makes it suitable for mass production.