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The so-called GPS is a terminal which is used to receive satellite signals and then carry out positioning or navigation. But antennas are naturally needed to receive signals. Today's GPS satellite signals are roughly divided into L1 and L2, with frequencies of 1575.42 MHZ and 1228 MHZ, respectively. L1 is an open civil signal and the signal is circularly polarized. The signal intensity is about - 166DBM, which is a weak signal. All these characteristics determine that special GPS antennas must be prepared for receiving GPS signals.

Classification of GPS Antennas

If viewed from the polarization mode, the GPS antenna can be roughly divided into vertical planning and circular polarization.

_If only with the current technology, the effect of vertical polarization is still not comparable to that of circular polarization. Therefore, unless it is a special case, the common GPS antenna basically uses circular polarization.

_If the GPS antenna can be divided into built-in antenna and external antenna.
In fact, the position of antenna assembly is very important. In the early days, GPS handsets basically used the inverted antenna. At this time, the antenna and the whole machine are basically isolated, while EMI hardly has any impact on it, and the effect of receiving the satellite is very good. Now, due to the trend of miniaturization, GPS antenna is basically built-in, so the antenna must be above all metal devices, and the shell also needs to be electroplated and grounded well at the same time, away from EMI interference sources, such as CPU, SD card, SDRAM, crystal oscillator, DC/DC.