GPDF478A02 Datasheet, PDF (15/19 Pages) Taoglas antenna solutions – Embedded 47.5*47.5*8mm GPS L1/L2 Low Profile Stacked Patch Antenna

The footprint and reference layout are provided in the figures 2 and 3, respectively. These
connections are shown schematically in Figure 1. A bill of material is presented below in Table 1.
It is critical to match the trace lengths of the 0°/90° feeds for each band, within a +/-0.5mm
tolerance. The feed lengths between bands do not need to be matched. For example, the trace
length between L1-0° and X1 pin 1 needs to be the same length (within +/-0.5mm) as the trace
length between L1-90° and X1 pin 2. But the trace length between L1-0° and X1 pin 1 does not
need to be the same as the trace length between L2-0° and X2 pin 1.
Figure 1. Schematic representation of GPDF.47.8.A.02 feed network. The pin numbers of hybrid
couplers X1 and X2 follow the manufacturer’s datasheet reference.
SPE-16-08-044/A/WY Page 15 of 19