TIDA029A july 2019 – june 2023 CC2640R2F-Q1 , CC2642R , CC2642R-Q1
This application note helps hardware and RF designers implement a compact PCB antenna array to accurately measure the angle of arrival (AoA) of an incoming Bluetooth® signal. Antenna design considerations are discussed along with antenna array test results and methods for calculating the AoA.
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Bluetooth® angle of arrival (AoA) measures the angle or direction a Bluetooth Low Energy (BLE) transmitted signal approaches a Bluetooth receiver. To calculate the AoA, two or more antennas are required to measure the phase of an incoming signal.
The phase measurements from each antenna are used to calculate the AoA and determine the direction of the transmitted signal. This application note explains AoA antenna design considerations, shows test results from some antenna arrays, and demonstrates how to calculate the AoA measurement from the phase measurement data of the antenna array. For more background information on Bluetooth AoA, see the Bluetooth Low Energy Angle of Arrival (AoA) SimpleLink Academy and the BLE-Stack User's Guide.