A single dipole antenna array can measure the AoA of an incoming signal in one plane (that is, x, y, or z). If it is required to measure the direction of a signal in another plane, an additional dipole antenna array is required aligned parallel to the plane.

Figure 3-4 Antenna Array Orientation

This can be done on a single PCB such as the SimpleLink™ Angle of Arrival BoosterPack or by using another single antenna array PCB such as the TIDA-01632 reference design in another orientation.

Figure 3-5 Measuring AoA in Two Planes With Multiple Dipole Antenna Arrays

In this example, the blue antenna array measures AoA in the y-plane, determining how high or low the key is located relative to the antenna array regardless of the key being located to the left, right, or center of the vehicle. The red antenna array measures AoA in the x-plane, determining if the key is to the left, right, or center of the vehicle passenger door regardless of how high or low the key is relative to the vehicle.