Implementation of Ultra-Wideband (UWB) Sensor Nodes for WBAN Applications - Ultra-Wideband and 60 GHz Communications for Biomedical Applications - page 118

Fig. 13 Frequency spectrum of amplifier-based sensor node at a pulse generator output, b band
pass filter (3.5-4.5 GHz) output, and c amplifier output

Fig. 14 Amplifier-based UWB sensor node design and transmit spectrum

level of the transmitted UWB signal within the band of 3.5-4.5 GHz (as marked in
Fig. 13 ) while containing the power level within the FCC spectral mask.
Figure 14 shows the UWB sensor node designed based on the amplifier method
and its transmit spectrum. The sensor nodes are assembled on a four-layer PCB
with dimensions of 27 mm (L)

× 25 mm (W) × 1.5 mm (H), which is sufficiently

compact for the use in a wearable WBAN node.