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CC1101: CC1101 Multiband antenna, from 433.92 to 868MHz

Alex Golubev
Prodigy 20 points
Other Parts Discussed in Thread: CC1101

Dear e2e community,

My customer needs to build a single hardware with one of our sub-G transceiver (CC1101), to be able to address multiple bands ( 433, 868 MHz).

How could we deal with antenna design?

Is there a way through a single PCB or mounted antenna?

Should we use a RF switch?

There is no performance constraint here (data rate nor distance).

Thanks.

  • 0
    TI__Mastermind 31560 points
    Hi Alex,

    With single hardware, do you mean one PCB with one BOM ?

    It is much easier with one PCB with two BOM but I presume that this is not the goal.

    For a common BOM, there are a couple of design challenges that need to be addressed. i.e. the 2nd harmonic of 433 MHz needs to be suppressed to under -36 dBm for 433 MHz operation and for 868 MHz operation, this should have low IL.

    Then the antenna needs to work at both 433 MHz and 868 MHz. How much space is available ?

    One suggestion would be to use a common passive balun to produce the unbalanced signal then feed this into the common feed of a SPDT switch. On the Dual-Throw side of the switch, I would use one LPF network and antenna tuned for 433 MHz and then one LPF network and antenna tuned for 868 MHz.

    Regards,
    Richard
  • 0 in reply to RGW
    TI__Mastermind 31560 points
    Hi,

    You have rejected the previous reply as an answer. Please explain why the previous answer cannot be used so we can help.

    Regards,
    Richard