Texas Instruments IWR6843L EVM, User Manual, Page: 7 / 16

4.1 Transmitter and Receiver Virtual Array
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.
Note
Wavelength (Lambda) is computed based on a 62 GHz frequency. Antenna placements are done
according to this frequency.
Figure 4-3. Azimuth Antenna Radiation Patterns
www.ti.com IWR6843LEVM Antenna
SWRU585 – NOVEMBER 2021
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IWR6843L EVM 7
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