Reducing the antenna range to 50 cm

[erselg]

Hi,

We are working on a smart lock project with nrf51822 third party module with an antenna on pcb.

We are trying to cover 50 cm range at -20 dbm. But even at -30 dbm we are still around 1 meter.

Is there any reference antenna design for that range, what kind of antenna should I use or what should we try to achieve this.

Thank your for your help,

I am sorry if this is a duplicate question.

[awneil]

Yes, it is a duplicate question: devzone.nordicsemi.com/.../

[RichieJH]

Cut the trace right before the antenna on your third party module and then see what happens. It is likely to still transmit something, might be what you are after.

[erselg]

Thank you very much, we will try it.