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CC1350: Device baluns and antenna/feedline options; dual-band, separate, RF switch, single-ended

Craig Easdale
Expert 2190 points

Part Number: CC1350
Other Parts Discussed in Thread: CC1310, CC-ANTENNA-DK2

I've been doing a bit for reading up and pieced together some information, but there are still a few unknowns for me when it comes to the antenna and RF setup of the CC1350.

  1. According to this thread, an integrated balun for the device didn't exist as of march 2017 but work was underway on a Sub-Ghz/2.4GHz one. Does it exist yet?

  2. In terms of antenna, it seems the options are either go the SensorTag route or Launchpad route
    1. Sensortag: Two single-ended antennas for each frequency, Less complex, but reduced power and sensitivity. 
      I can't, however, tell which 2.4GHz antenna was used on the Sensortag, though it does look similar to AN043
    2. Launchpad: Use an RF switch to have both antennas set up differentially. More complex, and likely can't use integrated baluns without experimentation/compensation due to them not being matched to the switch itself.

  3. I haven't found any information/designs that outline how to go about using a dual-band antenna, for which there are a few designs in the antenna DK. How would I go about doing this?

In general, I guess I'd like an update on the state of RF possibilities for a dual-band system based on the CC1350. I'm hoping to get a design using it finished in the next week so would like to fully understand my options before then if possible.

Thanks!

  • 0
    TI__Mastermind 36395 points
    • According to this thread, an integrated balun for the device didn't exist as of march 2017 but work was underway on a Sub-Ghz/2.4GHz one. Does it exist yet?
      • I have not seen it yet, but I will ask about progress.
    • In terms of antenna, it seems the options are either go the SensorTag route or Launchpad route
      • I would recommend to follow the LaunchPAD's designs as they have better performance and better software support.
      • The single ended did not work as well as we had hoped, so we now recommend differential designs like the CC1350LaunchPAD.
    • Sensortag: Two single-ended antennas for each frequency, Less complex, but reduced power and sensitivity.
      • Yes, less complex, but the RF performance is substantially worse.

    I can't, however, tell which 2.4GHz antenna was used on the Sensortag, though it does look similar to AN043

    • I would actually recommend a new dualband antenna that is becoming available on newer designs. Its a slight modification of the CC1310 LP antenna, but it works for both 2.4GHz and Sub1GHz.

    Launchpad: Use an RF switch to have both antennas set up differentially. More complex, and likely can't use integrated baluns without experimentation/compensation due to them not being matched to the switch itself.

    • That is a risk, but I believe it should work. I do recommend adding a pi-network for optional matching.

    I haven't found any information/designs that outline how to go about using a dual-band antenna, for which there are a few designs in the antenna DK. How would I go about doing this?

    • We use either an RF switch to merge the two paths or we use an RF-diplexer.

    Regards,

    /TA

  • 0 in reply to TA12012
    Expert 2190 points
    Thank you for your reply.

    Do you have any example designs that illustrate the dual-band setup with the new dual-band antenna (similar to CC1310LP), or any examples that utilise the RF-diplexer?
  • 0
    TI__Mastermind 34240 points

    Hi,

    1. The CC1350 IPC performance was not acceptable so this will not be released as a reference design.

         Please refer to the standard ref design for CC1350: www.ti.com/.../swrc333

    2. The exact antenna lengths and matching for the SensorTag are specific for the SensorTag due to the mechanics and casing. For general antenna ref designs, please refer to the CC-Antenna-DK2

    3. Several dual-band antenna are available in the CC-Antenna-DK2. With several RF ports, a switch or diplexer can be used to connect to a single common RF port.

    Regards,

       Richard