The AWR2944EVM includes onboard etched antennas for the four receivers and four transmitters, which enables tracking multiple objects with their distance and angle information. This antenna design enables estimation of both azimuth and elevation angles, which enable object detection in a 3-D plane (see Figure 2-14).

The antenna placement shown in Figure 2-14 results in the virtual antenna array shown in Figure 2-15.

The antenna peak gain is 13 dBi across the frequency band of 76 to 81 GHz. The radiation pattern of the antenna in the horizontal plan (H-plane) and elevation plan (E-plane) is as shown in Figure 2-16 and Figure 2-17, respectively.

The beamwidth of the antenna design can be determined from the radiation patterns provided below. For example, based on 3-dB drop in the gain as compared to bore sight, the horizontal 3dB-beamwidth is approximately ±30 degrees (see Figure 2-16), and elevation 3dB-beamwidth is approximately ±3 degrees (see Figure 2-17). Similarly, the horizontal 6 dB beamwidth is approximately ±45 degrees (see Figure 2-16) and the elevation 6dB-beamwidth is approximately ±5 degrees (see Figure 2-17).