• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 51 subscribers
  • Views 470 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BOOSTXL-AOA: Antenna design issue

user6254771
Prodigy 50 points

Part Number: BOOSTXL-AOA

Hi Team,

In the Application Report "Bluetooth® Angle of Arrival (AoA) Antenna Design", the description of chapter 3.3 (page 11) is as following,

3.3 PCB Implementation The ¼ λ dipole antennas were designed at the center of the Bluetooth Low Energy frequency spectrum (2.44 GHz)

But as I know the dipole antennas should be ½ λ, so the resonance frequency will be 4.9GHz in TI's design. But BLE operation band should be 2.44GHz.

May I know the know-how of the antenna guideline? Thanks. 

  • 0
    TI__Genius 9215 points

    Hi,

    Yes, you are right. Ideally dipole antennas should be ½ λ but for an AoA application where you look at the phase difference between antennas the antenna spacing should also be less than ½ λ (maximum phase difference of 180°). On the BOOSTXL-AoA board the dipoles are made shorter to enable smaller spacing between the antennas with the downside of lower antenna efficiency.

    You can find more information on the antenna spacing in chapter 2.1 in this application report: AoA Antenna Design

    Best Regards,

    R.M