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IWR1843: Antenna selection.

Ronnie
Prodigy 90 points
Part Number: IWR1843

When selecting the antennas to use in a 1TX 1RX configuration, is there anything that prevents me from using TX1 and RX4 as a pair instead of TX1 and RX1? Or if there are any drawbacks I should be aware of?

Also, can I leave the pins for the antennas I'm not using open (not connected to anything) on the PCB, or should these be grounded in some way?

The reason why I'm asking is that TX1 and RX4 are physically closer to each other on the chip, making the current layout I'm working on easier to manage. I'm going to use a similar antenna design as the one present on the IWR1843BOOST evaluation board, but without the redundant antennas for my configuration.

  • 0
    TI__Mastermind 33805 points
    Ronnie said:
    Also, can I leave the pins for the antennas I'm not using open (not connected to anything) on the PCB, or should these be grounded in some way?

    The Tx pins that are not used can be left open.  The Rx pins that are not used should be connected to GND through a 50 ohm resistor, we are not expecting RF transmission so a standard resistor is OK

    Ronnie said:
    When selecting the antennas to use in a 1TX 1RX configuration, is there anything that prevents me from using TX1 and RX4 as a pair instead of TX1 and RX1? Or if there are any drawbacks I should be aware of?

    1 tx, 1 RX used is fine. For you antenna design you need to consider the TX to RX isolation, antenna gain/pattern and other factors that matter to your application.