The reference circuitry schematic shows the dual antenna application schematic.

Figure 1. Reference circuitry schematic for dual antenna
reference circuitry

The following table lists the recommended and tested component types and values.

Table 1. Bill of material for QFN16
Designator Value Description Footprint
C1, C3, C5 1.0 pF Capacitor, NP0, ±0.05 pF 0201
C2, C4 2.0 pF Capacitor, NP0, ±0.05 pF 0201
C6 100 nF Capacitor, X5R, ±10% 0201
C7 10 µF Capacitor, X5R, ±20% 0603
L1, L3 1.9 nH High frequency chip inductor, ±0.1 nH, 120 mΩ 0201
L2, L4 3.0 nH High frequency chip inductor, ±0.1 nH, 120 mΩ 0201
R1 33 kΩ Resistor, ±1% 0201
U1 nRF21540-QDAA Radio front-end/range extender for 2.4 GHz QFN-16