ZHCU623 January   2019

 

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2.4.2 Range

Range on the BLE broadcast is highly dependent on both the initial output power from the antenna and layout of the board. To minimize the human body attenuation of the signal, the RF antenna should be exposed on one side to allow for better signal propagation and range. While worn, the device output power from the on-board F-type antenna is roughly –48 dBm at close range without any matching performed. This gives the patch an expected range of greater than 12m (39 feet). This is dependent on the sensitivity of the receiver and any obstacles that may be in the device path. Section 3.2.2.2 shows the testing used to determine the range of the design. In practice, a range of roughly 40 feet in an open environment was observed.