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nRF8001 Antenna Matching Network

Dino

I’m using nRF8001-R2Q32-T in my design, RF Balun (part number: 2450BM14A0002T), and 2.4GHz Chip RF Antenna (part number 2450AT18A100E). My question do I still use any network (capacitor, inductor, resistor) or the Balun is taking care of that. Is that mean that i don't have to worry as long as I'm using the correct Balun

Thank you Dino

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    The important factors about the balun location is it needs to be very close to the radio IC or the match it was designed for is no longer valid. Johanson specifies less than 2mm in their app note for the balun. Also, input and output feed lines need to be characterized. Input is per Johanson spec output is 50ohm. For standard 2 layer, 0.062" board most people do this as a coplanar wave guide with ground plane. It's the only style of stripline that will be sufficiently narrow to actually hook up to these parts.

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    The important factors about the balun location is it needs to be very close to the radio IC or the match it was designed for is no longer valid. Johanson specifies less than 2mm in their app note for the balun. Also, input and output feed lines need to be characterized. Input is per Johanson spec output is 50ohm. For standard 2 layer, 0.062" board most people do this as a coplanar wave guide with ground plane. It's the only style of stripline that will be sufficiently narrow to actually hook up to these parts.

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