I dont find at comercial scale small packaged ublox F9P board so I'm planing to design one (https://www.u-blox.com/en/docs/UBX-18010802)
objective is a 25x25 mm pcb with ZED-F9P on bottom layer and antena above
recomended antena is described below :
|Minimum active antenna gain
|Maximum active antenna gain
|L1 band antenna gain
|1559 - 1606 MHz: 3 dBic typ.
|L2/E5b band antenna gain
|1197 - 1249 MHz: 2 dBic typ.
|2 dB max at Zenith
|Phase center variation
|<10 mm over elevation/azimuth
|Group delay variation in-band
|10 ns max at each GNSS system bandwidth. Note:Inter-signal requirement 50 ns max.
|EMI immunity out-of-band
|40 dB typ
|ESD circuit protection
|15 kV human body model air discharge
all active antena I seen on your product pages is requierring at least 40 mm length ground plane witch is a bit to mutch for my footprint needs
can you help me a bit on that product selection phase ?