The block diagram shows the functional architecture of the nRF21540 EK. Figure 1. Block diagram Page-1 Process.3 RF connector RF connector Process.33 Matching network Matching network Process.35 Matching network Matching network Dynamic connector.54 Process.58 Arduino headers Arduino headers Process.74 Matching network Matching network Process.80 nRF21540 nRF21540 Dynamic connector.88 Dynamic connector.89 Dynamic connector.90 Dynamic connector.168 Dynamic connector.171 Dynamic connector.172 Sheet.22 Antenna Antenna Antenna.9 Sheet.24 Sheet.26 Antenna Antenna Antenna.27 Sheet.28 Process.159 RF connector RF connector Process.160 RF connector RF connector Sheet.50 Sheet.52 nRF21540 EK nRF21540 EK Nordic Middle Grey Radio input/output Radio input/output Dynamic connector