for nrf51822 , from where i can get the geometry, relative placement of the components with respect to each other, and the lengths of the transmission lines. only the values of the components are given in nrf51822 datasheet.

[Hamid@]

nrf

[bjorn-spockeli]

Hi Hamid, 

the reference design for the nRF51822 is used on the nRF51 DK and you can find the hardware layout files here: https://www.nordicsemi.com/-/media/Software-and-other-downloads/Dev-Kits/nRF51-DK/nRF51-DK---Hardware-files-1_2_0.zip. From these you should be able to see the relative placement as well as measure the length of the transmission lines

Best regards

Bjørn

[Hamid@]

Hi Bjon

first of all really thanks for you quick reply

i think my question was not clear i am only interested in antenna design for nrf51822 ,i follow this blog post ' General pcb design guidelines for nrf51' and its link is  "https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/general-pcb-design-guidelines-for-nrf51" 

 actually i want to use a chip antenna and then will connect it with nrf51, as shown below.

my question is, is it fine to use two matching circuit one for the chip antena as suggested by manufacturer and one which nordic suggested as shown in fig. and will it work in this way.it is only for testing purpose.

my second question is  the chip antenna should be exactly 2.4 GHZ or if it is 2.45 GHZ does it matter.

[bjorn-spockeli]

Hamid@ said:

my question is, is it fine to use two matching circuit one for the chip antena as suggested by manufacturer and one which nordic suggested as shown in fig. and will it work in this way.it is only for testing purpose.

 The PI matching network in the nRF51 DK layout will be equivalent with the matching circuit from the antenna manufacturer. However, you will have to tune the matching circuit, i.e. adjust the values, so I recommend that you post your layout here on devzone for a review,

 

Hamid@ said:

my second question is  the chip antenna should be exactly 2.4 GHZ or if it is 2.45 GHZ does it matter.

 Any 2.4GHz chip antenna with 50 Ohm impedance should work.

[Hamid@]

thanks a lot , once i am done with my layout then i will upload it for reviewing.

regards 

Hamid

[bjorn-spockeli]

Great