question about NFC and Bluetooth antenna

[Cindy]

Hi 

I'm really new to this filed and don't know anything about antenna, please forget me if the question is stupid. 

I have an nRF52 DK, I noticed the Bluetooth antenna on it is PCB antenna,  so my question is 

1) if I have to design my own, will it be hard or I can do the same on the development board?

2) or keep the same circuit design in the development board, but add an attached antenna, what specifications should I follow to pick the antenna?

And I know the NFC antenna on nRF 52 DK is not commercialized, so how do I find a replacement? 

(we want to use NFC to do some cellphone authentication, like between a cellphone and nRF52, so the distance will be close, like 3-5cm, but inside a plastic enclosure)

Any suggestion will be helpful.

Thanks

Cindy

[awneil]

Cindy said:

I'm really new to this filed

Which field, exactly?

Antenna design is very much a specialist subject - requiring specialist skills, experience, test equipment, etc.

You will be far better off using a module which either includes the antenna, or provides a connector for a ready-made antenna.

[Cindy]

Thanks for your reply. 

So I think nRF52832 doesn't have a built-in Bluetooth antenna. When I look for a ready-made antenna, what specifications I should care about?  and the nfc antenna as well?

[awneil]

Cindy said:

nRF52832 doesn't have a built-in Bluetooth antenna

Correct.

But many 3rd-party modules are available which incorporate an antenna; eg,

https://www.nordicsemi.com/?sc_itemid=%7BB04D6848-53F6-4DA2-85E1-B99CDFEE3FC5%7D

[Cindy]

thanks for the suggestion. idk they have third-party modules before, but my pcb design is almost finished just need an antenna. would you mind give me more suggestion on how to pick an attached antenna?