I have been testing the GPS / GPRS development module A9G, Aithinker which uses an active GPS antenna, according to the schematic reference diagram, the value of the inductance is 82nH:
The question is how did they reach the value of 82nH? and how the other parameters of the inductor are chosen, taking into account that the data of the antenna are:
High performance Beidou + GPS Antenna
Frequency range 1561MHZ 1575.42MHZ
Gain 28dBi
SWR ≤2.0
Beam width right-handed circular polarization(RHCP)
Input impedance 50Ω
Voltage 3-5v
Thank you