The transmitter and receiver antenna's positions form a virtual array of 12 transmitter and receiver pairs (as shown in Figure 4-2). This allows the object detections finer azimuthal angular resolution (15°) and coarse elevation angular resolution (58°). Receiver antennas are spaced at distance D (Lambda/2) and Transmitter antenna Tx1 and Tx2 spaced at 2D (lambda) in azimuthal plane and D (Lambda/2) in elevation plane. Tx2 and Tx3 are placed at D (lambda/2) in the elevation and 2D (Lambda) in azimuth plane.

Figure 4-2 Virtual Antenna Array

Figure 4-3 shows the antenna radiation pattern with regard to azimuth. Figure 4-4 shows the antenna radiation pattern with regard to elevation for TX1, TX2, and TX3. Both show the radiation pattern for TX1, TX2, and TX3 and RX1, RX2, RX3, and RX4 together. All of the measurements were done with a Tx and Rx combination together. Thus, for the -6dB beam width, you must see a -12db (Tx (-6dB) + Rx(-6dB)) number from the boresight.

Figure 4-3 Azimuth Antenna Radiation Patterns

Measured azimuthal radiation pattern for all Tx to Rx Pairs (Corner Reflector Placed at approximately 4 meters with a 2- GHz Bandwidth Chirp starting at 62 GHz).

Figure 4-4 Elevation Antenna Radiation Patterns