Classification of GPS antennas:

⒈ From the perspective of polarization, 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.

⒉ From the perspective of placement, GPS antennas are divided into built-in antennas and external antennas.

The assembly position of the antenna is also very important. Early GPS handheld devices mostly used external antennas. At this time, the antenna was basically isolated from the inside of the whole machine, and EMI had almost no effect on it, and the satellite reception effect was very good. Now with the trend of miniaturization, GPS antennas are mostly built-in. At this time, the antenna must be above all metal devices, the shell must be electroplated and well grounded, and away from EMI interference sources, such as CPU, SDRAM, SD card, crystal oscillator, DC/DC.

The application of car GPS will become more and more common. The outer shell of the car, especially the car explosion-proof film, will seriously hinder the GPS signal. An external antenna with a magnet (which can be adsorbed to the roof) is very necessary for car GPS.

3. From the power supply aspect, it is divided into active and passive.

The external GPS is an active antenna, for example, the external GPS antenna of Aerospace Communications is basically an active antenna. The passive antenna does not contain the LNA amplifier, but is just the antenna body.