Classification of GPS antenna

1、 Function of GPS antenna

Convert the electromagnetic wave emitted by the satellite into current. Since the GPS signal is a circularly polarized wave, all antennas work in a circularly polarized mode. GPS antenna is divided into built-in antenna and external antenna according to location, and the built-in antenna is divided into passive antenna and active antenna.

2、 Classification of GPS antenna

1. In terms of polarization mode, GPS antenna is divided into vertical polarization and circular polarization.

With current technology, the effect of vertical polarization is not as good as circular polarization. Therefore, except for special cases, GPS antenna will adopt circular polarization and linear polarization.

2. In terms of placement mode, it is divided into GPS built-in antenna and GPS external antenna.

The assembly position of the antenna is also very important. The early GPS handset mostly used the eversion antenna. At this time, the antenna is basically isolated from the interior of the whole machine, and EMI hardly affects it, so the satellite receiving effect is very good. Now, with the trend of miniaturization, GPS antennas are mostly built-in.

At this time, the GPS antenna must be above all metal devices, the shell must be plated and well grounded, and away from EMI interference sources, such as CPU, SDRAM, SD card, crystal oscillator, DC / DC. The application of vehicle GPS will become more and more common. The car shell, especially the car explosion-proof membrane, will seriously hinder the GPS signal. An external antenna with magnet is very necessary for vehicle GPS.

3. GPS antenna is divided into active and passive in terms of power supply.