This document describes a PCB antenna designed for 2.4 GHz operation. The antenna is an IP based solution from Pinyon    and can be used with all transceivers and transmitters from Texas Instruments,  which operates in the 2.4GHz  frequency  band. Maximum gain is measured to be 5.66 dBi and the antenna size is 35  x  50  mm.  Figure 1 shows a picture of  the   reference design using CC2430 and the Pinyon antenna. The EM board  is  designed  to  be  used  with  the SmartRF04 ®  board.

http://www.ti.com/lit/swra251