The CC1100EM PCB antenna reference design contains schematics and layout files for a CC1100EM implemented with a PCB antenna designed for 868 MHz and 915 MHz operation.
The reference design demonstrates how a PCB antenna could be implemented together with CC1100 or other RF products from Texas Instruments, operating in the 868 MHz and 915 MHz ISM bands. For optimum RF performance, the reference design should be copied accurately. The antenna dimensions should be exactly as in the reference design. Please see Design Note DN008 for a description of the antenna performance.