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.