DIY antenna in 5 minutes

To receive GPS signals, you can make a simple antenna, which in its capabilities will correspond to a small patch antenna.

The proposed antenna is a dipole, passive, so a small gain in the current consumption of the GPS module is achieved.

We take the center frequency of the GPS signal equal to 1575.42 MHz, we find the length of one arm of the antenna L / 4 = 47.7 mm. The figure is valid for wire without insulation. Insulated wire should be slightly shorter. The length of the shoulders of the dipole and monopole is counted from the edge of the cable sheath.

If there is only one half of the dipole, then this is already a monopole. I prepared a dipole and a monopole.



Antennas are mounted on a short coaxial with an IPX type connector. We use an active small patch antenna as a reference antenna. GPS module NEO6.



Compare the satellite signals shown in u-center 11/19/01.



Antennas, located close to the window. Orientation - according to the average maximum of signals.



Signal Levels

Ceramics:



Dipole:



Monopol:



Output:

1. An active patch antenna is comparable to a dipole.
2. The dipole gives an increase in gain relative to the monopole of ~ 5 dB (up to 4 times in power).

The main conclusion: a dipole can replace a small patch antenna. Current saving about 6 mA, with 3.3V power. (20 mW!). The mass of the small patch antenna is about 3 grams, the mass of the dipole with the IPX wire is only 0.65 grams!

Source: https://habr.com/ru/post/undefined/