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IWR6843: IWR Customized EVM board design

Raghavendra Mulimani
Prodigy 70 points
Part Number: IWR6843

Hello All,

         We are designing custom IWR6843 EVM board using the 6843 chipset, I have run the antenna simulations in HFSS tool, but our antenna simulation results are not matching as per TI simulated results released by TI in this community, I would like to know any feed back or inputs for us to proceed further.

I have taken the Stack up/ PCB material RO4835 LOPRO, 4mils thickness(dK 3.66, tan D: 0.0037) with appropriate Cu thickness, followed the same board stack up, material, antenna dimensions, yet results are not matchingIWR6843_Sim_results.pdf

> Return loss parameters are not matching

I have attached a word document with comparison of TI and our Simulation results, kindly revert us.

  • 0
    TI__Guru 50240 points
    Hi Gahavendra,

    I'll need to discuss this with my team before providing a response. Please allow us a few days.

    Cheers,
    AKash
  • 0 in reply to Akash Gondalia
    TI__Prodigy 10 points

    The picture shown below is the material parameters from Rogers.

    The bulk Dk is 3.55 and extracted Dk is 3.615.

    The simulated Dk value is 3.66 is higher than the 3.615.

    The patch impedance is sensitive to the Dk value.  Also there is variation of  substrate Dk.

    The recommended Dk = 3.58

    The matching will tuned to high with lower Dk value and tuned low with lower Dk value.

  • 0 in reply to Eunyoung Seok
    Prodigy 70 points

    Hi Eunyoung,

      Thanks for your inputs, I have modified my HFSS model in two ways, that is previously I had assigned lumped ports and now i have changed to wave ports 2nd change is yes I have even changed the dK of RO4835 to 3.55 and run the simulations, now the results are ok and match to TI results.

    Thank you all for your time to acknowledge & the support !!!