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CC2340R5: Help with adding a Meandered Inverted-F Antenna

Rob Oppen
Prodigy 100 points
Part Number: CC2340R5

Tool/software:

Hi,

We'd like to incorporate a Meandered Inverted-F Antenna (AN043) into our space limited custom CC2340R5 design. However, we know next to nothing about antenna design so I'm hoping to get some help with our design. A less than perfect antenna is ok for this round with good to great wireless performance.

We understand that an output pi filter is required (C33, C34, and L33) to reduce the harmonic content of the output of the PA to match 50Ω of impedance. So we should just copy this design, correct?

Looking at the LP-EM-CC2340R5 reference design there's also an antenna matching network for the Inverted-F PCB antenna. Is this needed for the MIFA? And if so, should we use the same values?

Finally, should we also include CA2 to block the DC bias voltage? And what is CR10 used for?

Here's the entire antenna design for reference:

Thank you,
Rob

  • 0
    TI__Expert 6500 points

    Hi Rob,

    1. We understand that an output pi filter is required (C33, C34, and L33) to reduce the harmonic content of the output of the PA to match 50Ω of impedance. So we should just copy this design, correct?

    • Correct

    2. Looking at the LP-EM-CC2340R5 reference design there's also an antenna matching network for the Inverted-F PCB antenna. Is this needed for the MIFA? And if so, should we use the same values?

    • The antenna matching circuit is needed for the MIFA, but those particular values is for the IF antenna (https://www.ti.com/lit/an/swru120d/swru120d.pdf)
    • However, If you're ok with a degraded radiated performance, then remove Z60 and Z62, and shorting Z61 would be fine for now because new matching values is needed anyways.

    3. Finally, should we also include CA2 to block the DC bias voltage? And what is CR10 used for?

    • CA2 is to block DC bias and CR10 is for ESD protection.

    Best regards,

    Bun

  • 0 in reply to Bun Kuch
    Prodigy 100 points

    Hi Bun,

    Thank you for the reply and help! For Z60, Z62, and Z61 are there starting values we can use or should we just DNP Z60/2 and 0 ohm Z61?

    Thank you,

    Rob

  • +1 in reply to Rob Oppen
    TI__Expert 6500 points

    Yes, Z60, Z62 = DNP and Z61 = 0 ohm.

    Unfortunately we don't have validated values for the MIFA so you'll have to do some matching.

    Bun