• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 52 subscribers
  • Views 2976 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.

cc1310 433MHz design, reducing RF track length implications?

Igor Sherer
Guru 31280 points
Other Parts Discussed in Thread: CC1310

Dear TI support team,

I'm in the middle of cc1310 5x5 for 433MHz band layout, however I have some limitations on PCB. I can overcome these limitations

by simply moving the SoC and its peripherals to the left edge of PCB, without moving PCB antenna (marked on attached image1).

To do so, I thought of reducing the length of feeding track (also marked on attached image2). The result of reduced track length by 10mm

is shown on inamge3.

What are the implications of reducing the length of this track from ~20mm (in ref design) to, say, ~10mm?


My design is based on the cc1310 preliminary ref design be TI from here.

Image 1

Image 2

Image 3

Thank you in advance.

  • 0
    TI__Guru**** 317180 points
    Our reference design has two restrictions when it comes to the length of the antenna track:
    - The EM connectors are fixed and hence the chip has to be placed in the middle
    - The feed point to the antenna has to be on the board edge due to the antenna size.

    In your case when you are not restricted by the EM connectors it's actually an advantage to reduce the length of the track between C51 and L9 since this line contribute to loss. The track should be designed as a 50 ohm line.
  • 0 in reply to TER
    Guru 31280 points
    Thank you TER.