I am trying to understand what ferrite bead to use for the Ublox M10S GPS unit. I am using as a reference the design from SparkFun GNSS Receiver Breakout - MAX-M10S (Qwiic) (https://www.sparkfun.com/products/18037) - under Documents. The design calls for a 2.66 Ohm Ferrite Bead on the line being used to power the active GPS antenna (VCC_RF). I have looked at the provided Eagle files in KiCad and it does not show the exact ferrite bead component used. It just says 2.66 Ohm (package 0402).
My understanding on the FB usage is that it is there to reduce the noise on the RF line. I know that the GPS antenna operates at around 1500Mhz. Does this mean that I am looking for a FB with high impedance at that frequency? (Then why are they using 2.66 Ohm?). Most Ferrite beads that size don't have a high impedance at that frequency (go down after 1000Mhz). Others only show the impedance at the resonant frequency and no graph (e.g. 2 Ohms @ 100Mhz).
What should I be using?