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Original question:

BOOSTXL-AOA: About PCB pattern [2]

BOOSTXL-AOA: About PCB pattern [3]

Shoko
Intellectual 745 points

Part Number: BOOSTXL-AOA

Hello, 

I have some questions about the dipole antenna pattern of BOOSTXL-AOA. 

1) Is the feed line impedance of dipole antenna in layer4 50 Ohm? (Please see the image. ) 

2) Please let me know the impedance value of dipole antenna. 

(I think the marchand balun between dipole antenna and feed line does not impedance transformation. )

Please advise. Thank you. 

Shoko 

  • 0
    TI__Genius 9215 points

    Hi Shoko,

    Yes, the feed line impedance is 50 ohm.

    The trace between the feed line and the balun is for impedance matching.

    Best Regards,

    R.M 

  • 0 in reply to R.M
    Intellectual 745 points

    Hello R.M, 

    Thank you for reply. 

    Is 75 Ohm the dipole antenna impedance, even though it is stripline? 

    Regards,

    Shoko 

  • 0 in reply to Shoko
    TI__Genius 9215 points

    Hi Shuko,

    The impedance for the dipole antenna is ideally 50 ohm but we have made the dipoles shorter so that the antennas can be placed closer together with the drawback of less efficiency. The antennas on the BOOSTXL-AoA currently resonate and are most efficient at around 3.2 GHz but it could be possible to make the antennas electrical longer by placing a series inductor between the balun and antenna (one on each dipole).  

    The impedance on BOOSTXL-AoA at 2.44GHz is around 43.6Ω - j150.6Ω. I

    Best regards,

    R.M