NRF51822 Antenna

[Punit]

We have designed a custom BLE module by taking the NRF51DK as the refernece.We have also given provision for the Antenna connector and the Antenna design is same as the one on the NRF51-DK.But somehow, i am not able to detect the BLE radio.The Program is downloaded successfully on the chip.

1]What are the points that i must check from Hardware point? 2]Wwhich antenna part number to use to connect a external antenna?

plz help

[FormerMember]

Could you show a picture/gerber files of the antenna?

[Punit]

Due to confidentiality constraints, i am unable to post any pictures..Can u suggest any debugging steps that i can do at my end? Also, can u suggest the antenna part number?

Thanks in advance!

[FormerMember]

What is the distance from the chip to the antenna? The traces/transmission lines between the chip and the antenna should be 50 Ohm transmission lines (co-planar waveguide). To calculate the appropriate width of the antenna, appCad can be used.

I would also recommend you to take a look at the General PCB design guidelines for nRF51, perhaps that can be useful.