I'm struggling with antenna connections to GPS module in my PCB design.
My antenna is a smd passive patch antenna, "SGGP.25.4.A.02 from Taoglas". The antenna shape and recommended footprint is in the first two pictures. I'll be adding an antenna ground plane directly underneath the antenna.
I'm confused about the digital GND pads (1 to 9 in second picture) of the antenna connections. I'm guessing they need to be connected into the digital gnd layer I have on layer 2 through lots of vias with copper keepout regions between the ground pads and surrounding the feedline.
Is that correct?
The third picture is the only patch antenna layout I've managed to find from Abracon patch antenna application note but it's for an active antenna.
Their design is confusing me greatly and it doesn't seem right to me. They don't have an antenna gnd plane underneath the antenna.
I'm guessing the yellow region is a digital ground (separated from the ground of other components) and they're connecting the ground pads of the antenna to the ground of the GPS receiver through traces.
If I connect the gnd pads this way I'll have an interrupted antenna ground plane.