Beam-steering antennas especially with Butler matrix feed network are an effective remedy for wireless communications systems troubles such as disruptive effects in mm-wave frequency. In this work, a novel 4 x 4 Butler matrix feed beam steering antenna is designed at 35 GHz. A zeroth order resonance antenna element is used for bandwidth and radiation efficiency increment. To increase the gain of the antenna, a novel mm-wave Fabry Perot layer which is composed of a partially reflective surface is designed. All designing steps are presented.