The IWRL6432FSP EVM antenna includes three receive and two transmit FR4 based antennas on the PCB. This has an antenna gain of approximately 5-6 dBi across each antenna. Figure 2-1 shows the antenna configuration.

Figure 2-1 Receive (Rx) and Transmit (Tx) Antennas of the IWRL6432FSP EVM

PCB Material

The dielectric material used for the antenna and transmission lines is FR408HR 0.5 oz dual ply 2x1067 spread glass construction.

Figure 2-2 IWRL6432FSP EVM PCB Material Stackup

Transmitter and Receiver Virtual Array

Transmitter and receiver antenna positions in Figure 2-3 form a virtual array of six transmitter and receiver pairs. This allows object detections with finer azimuthal angular resolution (29°) and coarser elevational angular resolution (58°). Receiver antennas are spaced at distance D (λ/2) in the azithmul plane and D (λ/2) in the elevation plane. Transmitter antenna Tx1 and Tx2 spaced at D (λ/2) in the azimuthal plane and are not spaced out in the elevation plane.

Figure 2-3 Virtual Antenna Array

Figure 2-3 below shows the antenna radiation pattern with regard to azimuth and Figure 2-4 shows the antenna radiation pattern with regard to elevation. Both figures show the radiation pattern for each TX-RX pair in the complete virtual array. This means that for the -6dB beamwidth, users need to look for a -12dB (Tx(-6dB) + Rx(-6dB)) beamwidth from boresight.

Figure 2-4 Azimuth Antenna Radiation Patterns

Measured azimuthal radiation pattern for all Tx-Rx pairs (corner reflector placed at approximately 5 meters with a 4GHz bandwidth chirp starting at 59GHz).

Figure 2-5 Elevation Antenna Radiation Patterns

Measured elevation radiation pattern for all Tx-Rx pairs (corner reflector placed at approximately 5 meters with a 4GHz bandwidth chirp starting at 59GHz).