GPS it is a terminal that locates or navigates by receiving satellite signals. The antenna must be used to receive signals.What are the classifications of GPS module antenna?
First, from the way of polarization GPS module antenna is divided into vertical polarization and circular polarization.
As far as the existing technology is concerned, circular polarization works better in terms of performance. Therefore, except for special cases, GPS circular polarization will be used for module antennas!
Second, from the installation and placement of GPS module antenna is divided into built-in antenna and external antenna
The current GPS therefore, the module is gradually miniaturized, integrated GPS built-in installation and placement is mainly used for module antenna. At this time, the antenna must be above all metal equipment, the shell must be plated and well grounded, away from EMI for example, interference sources CPU, SDRAM, SD card, crystal oscillator, DC/DC.
Third, from the power supply, GPS module antenna built-in antenna is divided into active antenna and passive antenna.
1, passive antenna: generally not powered, so called passive antenna.
(1) Silver layer.
The silver layer on the surface of the ceramic antenna will affect the resonance frequency of the antenna, the ideal frequency is 1574.42MHZ, in the time of production, you can adjust the silver surface shape and frequency.
(2) Ceramic sheet.
The quality of ceramic powder and sintering process directly affects its performance. The larger the area of ceramic sheet, the higher the resonance frequency.
2、Active antenna
Antenna module is generally powered by the ceramic antenna, LNA (low noise signal module), cables, connectors, sealed waterproof ring, the so-called G-mouse.
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