Minimum PCB size and reasonable antenna efficiency

[hcglitte]

Hi,

The datasheet for the antenna used in the dev kit, P822601, has its specification performance measured on a PCB DUT at 140 x 50 mm^2 - which seems rather unnecessary big, even for the lowest 700 MHz band. A smaller PCB (half size) should still produce adequate antenna performance, in my opinion, based on some similar antenna simulations.

I was wondering if nordic has done any testing with this antenna (or others) on smaller sized PCB's and measured the antenna efficiency.

Thanks 

[Martin]

I saw somewhere a presentation from Nordic with a new Thingy that has the same form factor (around 50x50mm) and incorporates a nrf9160 and an antenna from Fractus. 
I did a prototype with a TRIO mXTEND antenna that uses the same antenna for cellular and GPS (two feeds) and was having reasonable performance (but with an uBlox modem and GPS)