about nrf51822 and chip antenna layout

RE: about nrf51822 and chip antenna layout

shad — Tue, 03 Feb 2015 18:07:37 GMT

I can not find the layout in the second link nRF51822-DF-ST nRF51822 Reference Layout Files with STMicroelectronics BAL-NRF01D3

is this still available?

RE: about nrf51822 and chip antenna layout

Wojtek — Thu, 21 Aug 2014 13:12:10 GMT

actually i meant nordics beacon, not apple ibeacon. If you don't have nordic smart beacon kit but some other nrf51822 kit, you can try asking nordic to provide you access to beacon files...

RE: about nrf51822 and chip antenna layout

skkang — Wed, 20 Aug 2014 15:23:17 GMT

thank you Wojtek. but as I search it, iBeacon's specification is not open source. so, maybe I can see that spec......

RE: about nrf51822 and chip antenna layout

Wojtek — Wed, 20 Aug 2014 09:21:18 GMT

nordics iBeacon does have chip antenna.

RE: about nrf51822 and chip antenna layout

skkang — Wed, 20 Aug 2014 07:34:28 GMT

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.

RE: about nrf51822 and chip antenna layout

skkang — Wed, 20 Aug 2014 07:30:43 GMT

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

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

RE: about nrf51822 and chip antenna layout

mnhs — Tue, 19 Aug 2014 16:50:09 GMT

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.

RE: about nrf51822 and chip antenna layout

Nikita — Tue, 19 Aug 2014 14:45:49 GMT

Can I get a layout using nrf51822 and chip antenna?

You can look at this:

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.