User's Manual

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recommendations.
Table6‐2:AntennaGuidelines

6.7 TransmissionLineConsiderationsfortheCC3220MODx
TheRFsignalfromthedeviceisrouted tothe antennausingaCoplanarWaveguidewithground(CPW‐
G)structure.TheCPW‐Gstructureoffersthemaximumamountofisolationandthebestpossible
shieldingtotheRFlines.InadditiontothegroundontheL1layer,placingGNDvias
alongthelinealso
providesadditionalshielding.Figure6‐11showsacrosssectionofthecoplanarwaveguidewiththe
criticaldimensions.
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Figure6‐11:CoplanarWaveguide(CrossSection)
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Figure6‐12showsthetopviewofthecoplanarwaveguidewithGNDandviastitching.
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Figure6‐12:CPW
withGNDandviastitching(Topview)
TherecommendedvaluesforthePCBareprovidedfor2‐layerboardsitTable6‐2and4‐layerboardsin
Table6‐3.