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Principle of GPS antenna
Apr 07, 2017

GPS is the terminal that locates or navigates by accepting satellite signals. And the reception of the signal must be used to the antenna. GPS antennas are divided into built-in antennas and external antennas. The early GPS hand-held machine adopts the valgus antenna, at this time the antenna and the whole internal basic isolation, EMI is almost not the impact of the star, the effect is very good. The GPS antenna has four important parameters: gain, standing wave, noise coefficient and axle ratio. The majority of GPS antennas are right-polarized ceramic media, the components of the ceramic antenna, low noise signal module, cable, connector.

At present, most GPS antennas are right-polarized ceramic media, the components are: ceramic antenna, low noise signal module, cable, connector.

The ceramic antenna is also called passive antenna, dielectric antenna, PATCH, it is the core of GPS antenna technology. The signal acceptance ability of a GPS antenna depends largely on the ingredients of its ceramics.

The low noise signal module is also called LNA, which is the part of amplifying and filtering signals. The selection of components is also important, otherwise it will increase the reflection loss of GPS signals, and causing excessive noise.

The selection of cables should also be used to reduce reflection as the standard, to ensure the matching impedance.