Rotman Lens Design and Simulation in ISM’s Band

ABSTRACT: Wide coverage area is one of the most important requirements of the antenna applications, such as radar systems or satellite communications. Rotman lens is a low cost beam forming system that provides wide scan angle and it is simple to implement in microstrip model [1]. Rotman lens is a multi-input device which controls the beam scan angle depending on the phase shift corresponding to the path length between the input source positions and the radiator elements. In this study, beside the Rotman lens design and implementation, the conventional matching method (taper line) between the lens region and feeder lines was simulated by FEKO [2] [3]. A new matching method based on the transmission line theory was developed by making use of the standing wave pattern obtained from the FEKO simulation results, to match the feeder line to the lens by considering the lens as a parallel plate region with a given aperture width. Keywords: Rotman lens, steering beam, phased array antenna. …………………………………………………………………………………………………………………………