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CC2640R2F: LAUNCHXL BOOSTXL-AOA Antenna distance for AOA algorithm

Terry Chan1
Prodigy 150 points
Part Number: CC2640R2F
Other Parts Discussed in Thread: BLE-STACK

Module :

 CC2640R2-LAUNCHXL MASTER

 CC2640R2-LAUNCHXL PASSIVE

 CC2640R2-LAUNCHXL SLAVE

PASSIVE ANTENNA  BOOSTXL-AoA

Hi ,

1. We are developing our own antenna. Basic on the AOA sample code, How we can change the Antenna's distance value (d)on the code?

2. What is the distance between Antenna A1.1 and A1.2

Thank you!

  • 0
    TI__Genius 11810 points

    Hi Terry, 

    Terry Chan1 said:
    1. We are developing our own antenna. Basic on the AOA sample code, How we can change the Antenna's distance value (d)on the code?

    I believe this is one of the parameters in the AOA_iatan2sc() function, but let me loop in our AoA expert to follow up here. 

    Terry Chan1 said:

    2. What is the distance between Antenna A1.1 and A1.2

    It's 35 mm for center to center of each antenna. 

    -Simon

  • 0 in reply to Simon J
    Prodigy 150 points

    Hi Simon,

    Thank you for your quick response.

    Our antenna's Parameters are ready, it is kind of challenger for our software developer to understand the samples code, which allows them to modify the Parameters and compensation Parameters.

    Please guide us to understand and modify the code to work with our antenna.

    I have enclosed the antenna parameters for your reference. the distance between the two antennas is 80mm.

    Yours sincerely,

    Terry

  • 0 in reply to Terry Chan1
    TI__Genius 9215 points

    Hi Terry,

    The current AoA software example do not directly take the antennas distance value (d) as a parameter. For the BOOSTXL-AoA board this is a part of the angle compensation values based on lab measurements. You can find more information on converting from phase difference into AoA in the Angle of Arrival SLA. The RTLS Toolbox in the BLE-Stack User's guide is also a good source for information on AoA. 

    I would recommend to keep the the distance between the antennas less than ½ λ (maximum phase difference of 180°). If the distance is more than ½ λ, the true phase difference could be incorrectly interpreted.

    Example: In a setup with for instance ¾ λ antenna spacing the theoretical maximum is 270° but when you calculate the phase difference (at maximum difference) you actually get the result of 90° (in-fact you are not able from this two phase measurement to determine if the correct result is 90° or 270°. If the maximum phase difference is always kept below 180° you will not have this problem.

    Best Regards,

    R.M 

  • 0 in reply to R.M
    Prodigy 150 points

    Hi R.M,

    Thank you for your information. We will redesign the antenna.

    Yours sincerely,

    Terry