about nrf51822 and chip antenna layout

[skkang]

I am making a module using nrf51822 and a chip antenna.

I need a layout from nrf51822 to a chip antenna through matching chircuit.

Unfortunately, I don't know how to tune antenna.

so, I will copy a layout in terms of chip antenna.

How can I get that layout? I also want to know a part number of chip antenna.

and,

This is another question.

In nrf51822 Developement kit, there are samples of nrf51822.

What kind of pakage is nrf51822 such as QFAA or QFAB???

regards.

[Nikita]

Can I get a layout using nrf51822 and chip antenna?

You can look at this:

• nRF51822-DF nRF51822 Reference Layout files
• nRF51822-DF-ST nRF51822 Reference Layout Files with STMicroelectronics BAL-NRF01D3
• nWP-018 Antenna tuning

What kind of part number of nrf51822??? such as QFAA or QFAB???

You can see it in product specification document in "10 Ordering information".

QFAA - 256kB flash

QFAB - 128kB flash

It's the only difference.

UPD:

Yes, my mistake, I thought that I've seen some chip antenna layout somewhere, but it seems it wasn't in Nordic examples.

You can see this one for example.

I want to know whether samples of nrf51822 in nrf51822 developement kit are QFAA or QFAB.

I don't know about developement kit, but in evolution kit there was QFAA chips.

[mnhs]

Tuning an antenna is always an issue as it depends on many factors including what material is the casing, how much material is there etc. Copy the reference layouts for prototypes. For production, you should perform thourough analysis as stated in the "Antena tuning" document using the spectrum analyser. If you can't perform those measurements, avoid using thick plastic enclosures and installing any metal parts close to the antenna as all those issues can detune the antenna quite significantly. Also, design the ground planes properly.

[skkang]

Thank you. But That reference layout with chip antenna is what I find.

How can I get that reference layout with chip antenna???

[skkang]

Thank you. But Those layouts above don't include chip antenna. do they???

I am finding the layout including a chip antenna.

and

I want to know whether samples of nrf51822 in nrf51822 developement kit are QFAA or QFAB.

[Wojtek]

nordics iBeacon does have chip antenna.