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CC1350 Dual Antenna Application

Dave Heinrick
Prodigy 10 points
Other Parts Discussed in Thread: CC1350, LAUNCHXL-CC1350

I am not an RF expert. I would like to use the following Johanson Technology chip antennas with the CC1350 due to size constraints. We are using the Murata XMSSJE3G0PA-003 RF switch (anyone know how to get this part?) same as CC1350 devkit to support both radio frequencies. The devkit has a lot of discretes for filtering and antenna matching. Its not clear what discretes we need to implement using the chip antennas with the CC1350 and RF switch. I know we will need the Pi filters. We have a small pcb and there are a lot of discretes in that circuit. Can anyone provide some guidance for what filter/matching circuit is needed for my application for both the sub 1G and 2.4Ghz using the CC1350 and the Murata RF switch? Or if there are better alternatives? Thanks

Johanson Sub 1G chip antenna:

0868AT43A0020

Johanson 2.4 GHz chip antenna:

2450AT18A100

  • 0
    TI__Mastermind 33830 points

    Hi,

    In the "LAUNCHXL-CC1350 Design Files" ref design (www.ti.com/.../swrc320), there is a reference schematic: LAUNCHXL-CC1350_EU_1_1_1_Schematic.pdf

    L32, C71 & C23 are used for antenna matching for the sub-1GHz antenna.  C24 and C59 are used for  antenna matching for the 2.4 GHz antenna.

    If you will be using a different antenna, then these antenna matching components will need to be updated to new values. These values will be dependent on the GND plane size, casing and layout regardless of the type of antenna used. Chip, PCB, wire etc. 

    If you want to use just one antenna. Then a diplexer can be used to connect to a dual-band antenna.

    Regards,

       Richard