GPS antenna tuning

This page will describe al whole procedure on how the antena was tuned.

https://synzen.com.tw/products/lodestar antenna is used for the Rhino Tracker. This is the tuning process for air.

Schematic

Equipment

For GPS antenna tuning a MegiQ VNA-0460 VNA was used. VNA and cable were calibrated with custom calibration kit.

Measurements with recommended component values

Datasheet recommended component values

Because one of the component was not in stock at office w tried with 10pF instead of 8.2pF on C2

• C13 - 15pF

• C3 - 1pF

• C2 - 10pF

• L4 - DNP

Change recommended components 1

• C13 - 15pF

• C3 - 1.5pF

• C2 - 11pF

• L4 - DNP

Change recommended components 2

• C13 - 15pF

• C3 - 1.5pF

• C2 - 6.8pF

• L4 - DNP

Conclusion

At this point we saw that we are not getting anywhere.

Measurements with new pi network configuration

Measurements 1

• C13 - 15pF

• C2 - 1pF

• C3 - 1pF

• L4 - 1nF

Measurements 2

• C13 - 15pF

• C2 - 1pF

• C3 - 1pF

• L4 - 2.2nH

Measurements 3

• C13 - 15pF

• C2 - 1pF

• C3 - 2.2pF

• L4 - 2.2nH

Measurements 4

• C13 - 10pF

• C2 - 1pF

• C3 - 2.2pF

• L4 - 2.2nH

Measurements 5

• C13 - 22pF

• C2 - 1pF

• C3 - 2.2pF

• L4 - 2.2pF

Measurements 6

• C13 - 10pF

• C2 - 1pF

• C3 - 3.3pF

• L4 - 2.2nH

Measurements 7

• C13 - 10pF

• C2 - 3.3pF

• C3 - 3.3pF

• L4 - 2.2nH

Measurements 8

• C13 - 10pF

• C2 - 4.7pF

• C3 - 3.3pF

• L4 - 2.2nH

Measurements 9

• C13 - 10pF

• C2 - 4.7pF

• C3 - 4.7pF

• L4 - 2.2nH