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MMWCAS-RF-EVM: MMWCAS-RF-EVM Antenna Calibration Alignment

Hang
Intellectual 765 points
Part Number: MMWCAS-RF-EVM

Hello, 

I am going to do the antenna calibration for MMWCAS-RF-EVM. From this document (page 31), C:\ti\mmwave_studio_03_00_00_14\docs\mmwave_studio_cascade_user_guide.pdf, it asked to put the corner reflector in boresight. I made a corner reflector with RCS of 1 m^2 to 2 m^2.

Considering the RF antenna surface, I want to confirm which point (on the RF surface) I should make alignment with the center of the corner reflector. 

Is the origin of the Antenna Axes Definition picture below, or it does no matter which point I should use to make alignment with the center of the corner reflector?

Thank you very much!

Best,

Hang

  • 0
    TI__Genius 13805 points

    Hi,

    Would recommend to look at https://www.ti.com/lit/pdf/tiduen5.pdf which talks in detail about, procedure and setup of Antenna calibration. Corner reflector seems ok, however the distance and position of corner reflector to be kept is talked, and shown in figure also in the above referred TI deign user guide.

    Regards

  • 0 in reply to Abhed Misra
    Intellectual 765 points

    Hi Abhed,

    Thanks! I also took a look of that document. What I was not sure is the statement below.

    It says "The corner reflector should be aligned with the array center of board in both azimuth and elevation direction". Here what does the array center of board referring to?

    Thanks!

    Best,

    Hang

  • +1
    TI__Genius 13805 points

    Hi,

          The center of the board is referred with height and length of the board. Please note the recommended calibration proceudre in the user guide is for the Antenna pattern used in the cascade EVM, if you use your own antenna pattern then you may have to alter teh calibration proceudre and scripts.

    Also, the position / placement of corner reflector depends on the what you are calibrating. For example if you are calibrating the TX beam with all TXs ON, then you would have to ensure that phase of all TX's are calibrated so that with all TX's ON, you get a strong beam formed and your calibration is effective.

    Regards

  • 0 in reply to Abhed Misra
    Intellectual 765 points

    Hi Abhed,

    Thank you so much! That's very clear!

    Best,

    Hang