A 2 × 2 Monopole Antenna Array for Ceiling-Mount Wireless Access point

To meet the increased demand in bandwidth from state-of-the-art wireless communication systems, the propagation environment should be taken into account when it comes to antenna design. In this work, a 2-by-2 array antenna is proposed for ceiling-mount access points. To provide a more complete coverage, four squint beams can be generated with this beam forming network based array. Four antennas are excited with a 0°, 90°, 90° and 180° phase profile, which yields a beam tilted away from the boresight. To demonstrate its applicability for ceiling-mount devices, a 2-by-2 monopole array as well as a patch array was devised. Simulations and measurements were conducted to verify the tilting beam characteristic.