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CC2530-CC2592EM-RD: Antenna tuning

Narender Mariappan
Prodigy 30 points
Part Number: CC2530-CC2592EM-RD

Hi team,

I have used CC2530-CC2592 in my design for Smart plug Application  and my antenna is not tuned to 2.4GHZ but it is tuned for 1.9 GHZ. I have used AN043 PCb Antenna in my design.Below i have attached layerstackup and SCH design.For CPW50 Reference plane 3 is considered.Kindly Share your thoughts regarding this 

  • 0
    TI__Guru**** 168422 points

    Hi,

    I am not entirely sure what is the question, but if I understood correctly the antenna AN043 is inadvertently detuned at the desired frequency of 2.4 GHz, is that so?

    If so, then the network leaving the ANT pin 10 (C17~C20, L3, L4) should be designed to perform antenna matching. This number of elements should give plenty of margin to perform this matching, including reducing the higher order harmonics (important to pass certification). Section 6 of the application note below has details about how to perform various antenna measurements to help with the antenna matching process. 

    https://www.ti.com/lit/pdf/swra161

    The provided stackup does not give enough information about the impedance of the lines, but I can tell that it differs from our reference design CC2538-CC2592-EMK. Also, the Dielectrics 1 and 2 have slightly different εr , which is not very critical but adds complexity to any impedance calculation.

    At last, be sure to check the surroundings of the antenna, where enclosure, large ground planes, etc. can severely influence the matching.

    Hope this helps,

    Rafael

  • 0 in reply to desouza
    Prodigy 30 points

    Hi Desouza ,

    yes it helps, but one clarification is that for (C17~C20, L3, L4) is there any specific formulas / Calculations for antenna tuning ?? 

  • 0 in reply to Narender Mariappan
    TI__Guru**** 168422 points

    Hi,

    Given the variations in the PCB manufacturing, as well as the parasitics introduced by soldering, the parts themselves and other factors, unfortunately it is not practical to develop an equation to cover all scenarios without it being very oversimplified. That is why I mentioned the related application note, which covers a procedure to perform measurements directly on the prototype board - this would be the most practical way to determine the final matching. 

    Regards,

    Rafael