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Antenna Selection

Jeff Finkelstein

We plan on use the ST BAL-NRF01D3 balun for a PCB with both an nRF51822 and a nRF51922 on the same PCB separated by about 4 inches.

Should we use the PCB antenna as on the reference Dongle OR Development board OR should we think about a chip antenna for best performance?

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  • FormerMember
    0 FormerMember

    The ST BAL-NRF01D3 balun is used for matching the chip to 50 Ohm, making a 50 Ohm point, and is not for tuning of the antenna. As the schematic shows you will, in addition to the balun, also need a capasitor for matching the chip to 50 Ohm. The tuning network for the antenna (pi-network or shunt tuning component) will be placed after this capasitor.

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  • FormerMember
    0 FormerMember

    The ST BAL-NRF01D3 balun is used for matching the chip to 50 Ohm, making a 50 Ohm point, and is not for tuning of the antenna. As the schematic shows you will, in addition to the balun, also need a capasitor for matching the chip to 50 Ohm. The tuning network for the antenna (pi-network or shunt tuning component) will be placed after this capasitor.

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