Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 16 subscribers
  • Views 766 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

CC2530 Ref Design Board Thickness Change Antenna AN043

Jeremias Rey
Prodigy 20 points
Other Parts Discussed in Thread: CC2511, CC2530

Hello

I intend to design a RF board using the CC2530 with the inverted F antenna AN043. The thickness between Layer 1 and Layer 2 is 0.25mm in the Ref Design CC2511 USB Dongle, but my PCB manufacturer provides only a thickness of 0.38mm between layer 1&2. 

What do i have to respect in my design in reference to the beoad thickness?

Thanks!

 

  • 0
    TI__Genius 12545 points

    Hi Jeremias,

    PCB traces at radio frequencies have to be designed carefully to account for their distributed character due to their small size as compared to the wavelength.
     
    •Impedance of a single micro-strip trace over a ground plane depends primarily upon:
    • –Width of the trace
    • –Height above the ground plane
    • –Dielectric constant of the PCB’s dielectric
    • –Loss Tangent of the PCB’s Dielectric

    There are various impedance calculators available such as TXLine from AWR (http://web.awrcorp.com/Usa/Products/Optional-Products/TX-Line/)

    The change in thickness of the (height above ground plane) will cause a slight mismatch. This change should be compensated for by changing the balun and filter network from the RF output port to the antenna.
  • 0 in reply to Chatto
    Prodigy 20 points

    thank you, it was very helpful!