IWR6843ISK-ODS: About antenna layout

Tom Fisher

Part Number: IWR6843ISK-ODS
Other Parts Discussed in Thread: IWR6843ISK

Hi,

I have both IWR6843ISK-ODS and IWR6832ISK and found their antenna layouts are completely different.

The first questions is that how to identify TX1-TX3 antennas on each board. Or is there a convention for all TI radar products?

The second one is how the virtual antennas are generated for each board. For the ISK board example, TX antennas are separated in 4xd (d=1/2 lambda) spaces with the middle one upper about 2d spaces, how the vertical antennas are generated? By controlling the phases or something else? Is there more detailed document for the virtual antenna except swra554a?

That really confuses me and it would really appreciated someone could explain that in more details.

Thanks

Tom

over 5 years ago

0 Akash Gondalia over 5 years ago

TI__Guru 50240 points

Hi Tom,

Have you seen the Antenna Diagram in the EVM User Guide?

Regards,

0 Tom Fisher over 5 years ago in reply to Akash Gondalia

Expert 1440 points

Hi Akash,

I did not notice that. How about the second question?

Cheers,

Tom

0 CHETHAN KUMAR Y.B. over 5 years ago in reply to Tom Fisher

TI__Mastermind 25835 points

Tom,

For the 2nd question, You could refer to the below MIMO Radar app-note section 3.

http://www.ti.com/lit/an/swra554a/swra554a.pdf

Thanks and regards,

CHETHAN KUMAR Y.B.

0 CHETHAN KUMAR Y.B. over 5 years ago in reply to CHETHAN KUMAR Y.B.

TI__Mastermind 25835 points

Tom,

For IWR6843ISK below is the antenna placement, Tx antenna are placed with lamda (2D) spacing in azimuth; for the elevation Tx2 is spaced with lamda/2 (D) and all receiver are Lamda/2.

If you transmit from all the transmitters (one at a time) and receive from all 4 receiver and combine all the transmit and receiver together then you could construct a virtual antenna array as though one transmitter and 12 receivers shown placed as shown below.

If you refer to above app-note this give Angular resolution of ~14 Deg in Azimuth and 57 Deg in Elevation.

If you do similar exercise for the IWR6843ODS, you would get similar virtual array as shown below.

This produces equal angular resolution both in Azimuth and Elevation of the order of ~28 Deg.

Depending upon the Application you could use different antenna configurations.

For example: Wall mount detection applications you could use IWR6843ISK antenna, where higher degree of angular resolution is needed in azimuth than elevation.

For ceiling mount applications you could use the IWR6843ODS boards, where equal angular resolution both in azimuth and elevation direction is desired.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 Tom Fisher over 5 years ago in reply to CHETHAN KUMAR Y.B.

Expert 1440 points

hi CHETHAN KUMAR Y.B.,

This is what I've been looking for. Thanks a lot

Cheers,

Tom

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IWR6843ISK-ODS: About antenna layout