Design of beam steering antenna for localization applications

A 2.4 GHz beam steering antenna array is presented and tested in this paper. This antenna uses the 4×4 planar Butler matrix as a key component of phase-shifter which exhibits ±135° and ±45° phase shifts corresponding with four position of main beam. The proposed design is fully described, from the element blocks (antenna element, butler matrix) to the full integrated beam steering antenna array. The proposed antenna has the 20°-27° of beam-width in vertical and 240° of beam-width in horizontal. The main beam of this antenna can steer from -37°, -12°, 12° to +36° in vertical. Simulation results will be presented and compared with experimentation data.