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IWR6843AOPEVM: Inquiry Regarding Radiation Pattern Ripple Acceptance Criteria

Dileep Sharma
Prodigy 130 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843AOP

Tool/software:

Hello TI Team,

After simulating the TI IWR6843AOP antenna with and without the radome, we observed ripples in the radiation pattern. Could you please clarify the acceptance criteria for these ripples to ensure they do not compromise the performance of the mmWave device?

Additionally, is there a specific acceptance criterion for the ripples in terms of gain? How might these ripples impact the performance of the device, particularly regarding any specific performance metrics?

Thanks & Regards,

Dileep Sharma 

  • 0
    TI__Expert 3730 points

    Hi Dileep,

    Ripples are caused by multiple reflections at the radome interface boundary. This can further cause nulls in the radiation pattern. These ripples and nulls can cause inconsistency in the detection of the objects at higher grazing angles resulting in angle estimation errors.

    It is best to not have any ripples in the radiation pattern. However, with radome incorporated there is evident ripple in the radiation pattern. Hence, it is recommended to reduce the ripple as much as possible. As mentioned in the mmWave Radar Radome Design Guide (https://www.ti.com/lit/an/swra705/swra705.pdf), the ripple should be well within 1-2dB.

    Also, approximately 2-3 dB of two-way loss could be expected and needs to be accounted for in the system link budget analysis.

    Thanks,

    Swarnendu