The Structures and Principles of GPS Antenna
The Structures and Principles of GPS Antenna
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The Structures and Principles of GPS Antenna

Ⅰ. The composition of GPS antenna

GPS antenna is composed of receiving antenna and preamplifier. The function of the GPS antenna is to convert the electromagnetic wave energy of the radio signal from the satellite into a current that can be picked up by the receiver electronics. Most of the built-in GPS antennas are right-handed polarized ceramic media, and their components are: passive antennas, low-noise signal modules, cables, and connectors.

1. Passive antenna is the core technology of GPS antenna. The signal receiving ability of a GPS antenna depends largely on the components and ingredients of the passive antenna part.

2. The low-noise signal module is also called LNA, which amplifies and filters the signal. The selection of its components is also very important, otherwise it will increase the reflection loss of the GPS antenna signal and cause excessive noise.

3. The selection of cables should also be based on reducing reflections to ensure impedance matching.

4. The internal GPS antenna is also an important part.

Ⅱ. The working principle of GPS antenna

Ceramic chip: The quality of ceramic powder and the sintering process directly affect its performance.

Silver layer: The silver layer on the surface of the ceramic antenna can affect the resonant frequency of the GPS antenna.

Feeding point: The passive antenna collects the resonance signal through the feed point and sends it to the back end. Due to antenna impedance matching, the feed point is generally not in the center of the antenna, but slightly adjusted in the XY direction. Such impedance matching method is simple and does not increase the cost.

Amplifier: The shape and area of the PCB that carries the passive antenna. Because the GPS antenna connector has the characteristics of ground bounce when receiving signals, the choice of amplifier gain must match the back-end LNA gain.

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