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IWR1443BOOST: Beam Angle of EVM and interference when we use several IWR1443 BOOSTs with even space.

Kyu Chol Park
Prodigy 30 points
Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1443

now i consider apply IWR1443 EVM for Level sensing.

my question is as below

1) what is beam angle of IWR1443 EVM Antenna.?

2) I want to measure level of plate at several points with IWR1443 BOOST. 

   will there be no interference when the IWR1443 BOOST is installed close together? 

   i want to use 5 sets even space to measure level of plate.

please advise me what happen and how to do...

Thank you for reply..

  • 0
    TI__Mastermind 30405 points

    Hi Kyu  Chol,

    As defined in the IWR1443BOOST EVM user guide, the 6dB beam width in Azimuth (horizontal) direction is +/- 50 degrees and the 6dB beam width in Elevation (vertical) direction is +/- 20 degrees. Similarly, the 3dB beamwidths in Azimuth and Elevation directions are +/- 28 degrees and +/- 14 degrees respectively.

    For level sensing applications, generally it is a good idea to have a more focused beam i.e. narrow beam-width to avoid stray reflections from the container. This can be achieved with a dielectric lens to focus the beam or with an antenna design with narrower Field of view. Depending upon your application, you may want to consider these techniques as well.

    Due to the constantly changing frequency, FMCW in general is robust to interference but TI mmWave Sensors also include features to avoid, measure and reject interference.

    1. The possibility of interference can be minimized by selecting different ramp start times and/or frequency ranges at a profile level. The devices also provide the ability to dither these parameters (ramp start, ramp frequency etc) on a chirp by chirp level using chirp based dithering parameters. Please refer to these resources for more details: Programming Chirp Parameters in TI Radar Devices and MMWAVE SDK user guide (under profile and chirp configuration parameters).

    2. Chirp Quality Indicator, which can be used to detect interference in the received data frame and applying interference cancellation techniques in software processing.

    Please also refer to the following threads on the subject of interference mitigation:

    AWR1642: AWR Interference

    AWR1443: Can two sensors be used simultaneously

    IWR1642: How to avoid the Radio Wave interference if there are several IWR devices operate in the small area

    AWR1243: Is it possible to disable TX but enable RX and mixer to detect interference?

    Thanks

    -Nitin

  • 0 in reply to Nitin Sakhuja
    Prodigy 30 points

    Dear Nitin

    Thank you for your reply.... 

    it is helpful for me. 

    i have one more question in your advise. 

    if i apply dielectric lens with IWR 1443 or 1642, 

    IWR1443 and 1642 has several TX and RX Antenna in the EVM Board, should i use dielectric lens for each TX and RX antenna or only one antenna is enough to minimize beam angle?

    and if you know manufacture dielectric lens, could you let me know it?

    because i am not professional in RF divisions, i don't know this. 

    Thank you so much for your advise.

    KyuChol Park.

  • 0 in reply to Kyu Chol Park
    TI__Mastermind 30405 points
    KyuChol,

    The use of dielectric lenses is more suited for a single TX and single RX application where you don't need angle of arrival information, with separate lenses for TX and RX. If your application needs multiple TX and/or RX channels, it is recommended to design an antenna which matches the beam-width requirements of your application. We don't have a recommendation for lens manufacturer at this point.

    Thanks
    -Nitin