Reading Time: 3.1 Mins

GPS antenna structure and principle

Interviews — 5 Min Read

Avada Galerie Workshop

1.The composition of the GPS antenna

The GPS antenna is composed of two components: the receiving antenna and the preamplifier.

The function of the GPS antenna is to convert the electromagnetic wave energy of the radio signal from the satellite into the current that the receiver electronic device can ingest and apply.

Most of the built-in GPS antennas are right-handed polarized ceramic dielectrics, 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 acceptance capability of a GPS antenna largely depends on the composition of its passive antenna part.

2. The low-noise signal module, also known as LNA, is the part that 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.

2.The working principle of GPS antenna

Ceramic sheet: 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.

Feed point: The passive antenna collects the resonance signal through the feed point and sends it to the back end. Due to the impedance matching of the antenna, the feed point is generally not in the center of the antenna, but slightly adjusted in the XY direction. Such an impedance matching method is simple and does not add 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 of the received signal, the selection of amplifier gain must match the gain of the back-end LNA.

Stay Up To Date With Our Latest Products

We will process the personal data you have supplied in accordance with our privacy policy.