GPS is a terminal for positioning or navigation by receiving satellite signals. To receive a signal, an antenna must be used. For these, the strike should be no stranger! Perhaps the classification of GPS antennas is not very clear, the following will explain for you:

GPSFrom the polarization mode, GPS antennas are 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 antennas will use circular polarization and linear polarization.

GPSThe GPS antenna is divided into built-in antenna and external antenna in terms of placement.

The antenna assembly position is also very important. Early GPS handsets mostly used flip-out antennas. At this time, the antenna was basically isolated from the inside of the whole machine, and EMI hardly affected it. With the trend of miniaturization, GPS antennas are mostly built-in. At this time, the antenna must be above all metal components. The inside of the case must be plated and well grounded, and away from sources of EMI interference, such as CPU, SDRAM, SD card, crystal oscillator, DC / DC.

Vehicle GPS applications will become more and more common. And the car's shell, especially the car's explosion-proof film, can cause serious obstacles to GPS signals. An external antenna with a magnet (can be attached to the roof) is very necessary for car GPS.

3. There are active and passive in terms of power supply.

External GPS is an active antenna. For example, an external antenna such as a gamma GPS antenna is basically an active antenna. The passive antenna does not include the LNA amplifier, but the antenna itself.