Design Note DN033
AMD1103-ST01 antenna presented in this document performs well in the 868 MHz and 915 MHz ISM band; 955 MHz frequency band is also recommended for this antenna. Table 6 lists main results measured on the presented antenna. Note that the gain numbers are given in dBd and the formula converting it to dBi is shown in Equation 1.
The antenna can also be used at lower frequencies such as 433 MHz but then the efficiency of the antenna will be lower  compared to operation at 868 MHz . The measurements performed on the CC-Antenna-DK with the Mitsubishi antenna are similar to the measurements performed on the CC1101-Q1 Evaluation Module.
868MHz BW (VSWR
915MHz BW (VSWR
868MHz 3 plane total average power 915MHz 3 plane total average power Antenna Size
68 MHz 80 MHz
mm 3.0mm 0.8m
Table 6. 915 MHz Summary of Antenna Properties
dBi = dBd + 2.14
Equation 1. Conversion to dBi
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