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IWR1443BOOST: PCB Material; RF TX&RX line width; impedance

Zhenhua Yue
Intellectual 295 points
Part Number: IWR1443BOOST

PCB Material is 4835 according to "IWR1443BOOST_Rev-A-Stackup.pdf".

RF TX&RX line width is 7mil  according to "IWR1443BOOST-Rev-A.brd".

After calculation, the impedance is not 50R.

Where is the mistake?

  • 0
    TI__Mastermind 37500 points

    Hello,

    The PCB material for L1-L2 is Rogers 4835 LoPro, 4mil dielectric.

    The desired impedance is 50 ohms.   The Grounded Coplanar Waveguide is designed from the device ball, to the antenna stripline.  The dimensions are shown

    in the attached reference.  Note there is a GND void on L2 below the L1 pad as an impedance compensation.  The GPCW to antenna stripline is also optimized for 50 ohms,   This connects the antenna patch to the GPCW.  

    If you follow the Cadence layout, your can compare the desired impedance with the Rogers calculator for stripline,   

    Regards,

    Joe Quintal

    6663.TImmwave_Radarsensor_RFPCBDesign_Manuf_Validation_spracg5.pdf