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Original question:

IWR1843: Harmonic attenuation

IWR1843: Second harmonic

Masatsune Isihara
Prodigy 60 points
Part Number: IWR1843
Other Parts Discussed in Thread: , AWR1843

Hi Experts,

I'm looking for a design guarantee to prove that the second harmonics aren't radiated at high levels.

(second harmonic: 158GHz when IWR1843 outputs 79GHz)

Is there any material such as the K-factor of the output side PA in the figure below?

I understand that these frequencies comply with FCC and ETSI regulations.

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1088400/iwr1843-harmonic-attenuation?tisearch=e2e-sitesearch&keymatch=%20user%3A287568#

Thank you.

Best regards,

Ishihara

  • 0
    TI__Genius 16310 points

    Hello Ishihara,

    Thank you for reaching out to Texas Instruments.

    We have received your query and are assigning it to the appropriate member of the team.

    Thanks,

    Ehtesham Shareef

  • 0
    TI__Guru 58035 points

    Hello Ishihara,

    As mentioned in the other e2e thread, we do not have measurements at 160Ghz, but we know its low enough not to cause any serious emission concerns. Could you let us know the reason you are interested in this? Typically your antenna itself would provide lot of attenuation at that frequency. 

    regards,
    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 60 points

    Hi Vivek

    We are considering using IWR1843 for our product.
    We are checking how to not inspect spurious during product shipment inspection.
    If we can prove that the IWR1843 itself does not emit spurious radiation, we can eliminate the spurious inspection.
    I asked if the output amplifier inside the IWR1843 would oscillate abnormally.
    Our products comply with Japanese RF certification.

    Regards,
    Ishihara

  • 0 in reply to Masatsune Isihara
    TI__Guru 58035 points

    Hello Ishihara,

    Any units that you would be receiving is not expected to have internal PA oscillating. At production we check for our TX performance.

    With regard to Japanese RF certification , that is not something we can guarantee. That would depend on your system design, antenna design etc. Also the Japanese standard is quite stringent, so inherently you might need to backoff the TX power to meet it. This is something you will have to check at your sensor level.

    regards,

    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 60 points

    Hi Vivek,

    Thank you for kind comments on this.

    We do not have the equipment to observe the Second harmonics band.
    We would like to confirm the spurious characteristics in our antenna design from the test report below and the antenna characteristics of IWR1843BOOST.

    12554995-E2V2 EN 302 264 v2.1.1 AWR1843 Series Final Report.pdf

    Is there any material related to antenna design such as antenna directivity data of 154.197GHz and attenuation by antenna?

    Regards,
    Ishihara

  • 0 in reply to Masatsune Isihara
    TI__Guru 58035 points

    Hello Ishihara,

    We do not have antenna simulation data for 150-160Ghz.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 60 points

    Hi Vivek,

    I understand that there is no antenna design data for 150-160Ghz.
    Is there antenna data for other bands?

    Thank you for your support.

    Regards,
    Ishihara

  • +1 in reply to Masatsune Isihara
    TI__Guru 58035 points

    Hello Ishihara,

    I was referring to antenna data for other bands. We have the antenna gain data only for 76-81Ghz band. For S11 we have data from 70Ghz to 85Ghz. This is shared below.

    Regards,
    Vivek

  • 0 in reply to Vivek Dham
    Prodigy 60 points

    Hi Vivek,

    I understand the data from 70GHz to 85GHz.

    Thank you for your support.

    Best regards,
    Ishihara