source:truck tracking webfleet solutions release time:2022-11-12 Hits: Popular:realtime gps tracker online
1. Ceramic chip: the quality of ceramic powder and sintering process directly affect its performance. The ceramic chips currently used in the market are mainly 25 × 25、18 × 18、15 × 15、12 × 12。 The larger the area of ceramic sheet, the larger the dielectric constant, the higher the resonance frequency, and the better the acceptance effect. Most of the ceramic chips are square in design to ensure that the resonance in the XY direction is basically consistent, so as to achieve the effect of uniform star collection.
2. Silver layer: The silver layer on the surface of ceramic antenna can affect the resonant frequency of antenna. The ideal frequency point of GPS ceramic chip is accurate at 1575.42MHz, but the antenna frequency point is very vulnerable to the surrounding environment. Especially when it is assembled in the whole machine, the frequency point must be adjusted to maintain 1575.42MHz again by adjusting the shape of the silver coating. Therefore, when purchasing antenna, the manufacturer of GPS complete machine must cooperate with the antenna manufacturer to provide complete machine samples for testing.
3. Feed point: the ceramic antenna collects the resonance signal through the feed point and sends it to the rear end. Because of antenna impedance matching, the feed point is generally not in the center of the antenna, but slightly adjusted in the XY direction. This impedance matching method is simple and does not increase the cost. Moving only in the single axis direction is called monopolarized antenna, and moving in both axes is called bipolarized antenna.
4. Amplification circuit: shape and area of PCB carrying ceramic antenna. Because GPS has the characteristic of touchdown rebound, when the background is 7cm × When the ground is 7cm, the patch antenna can play its best role. Although restricted by such factors as appearance and structure, try to maintain a considerable area and uniform shape. The gain of the amplifier circuit must be selected in conjunction with the rear LNA gain. The GSC3F of Sirf requires that the total gain before signal input shall not exceed 29dB, otherwise signal over saturation will cause self excitation.
The GPS antenna has four important parameters: Gain, VSWR, Noise figure, and Axial ratio. The axle ratio is especially emphasized, which is an important indicator to measure the signal gain difference of the whole machine in different directions. Since satellites are randomly distributed in the hemisphere sky, it is very important to ensure that the antenna has similar sensitivity in all directions. The axial ratio is affected by antenna performance, external structure, internal circuit of the whole machine and EMI.
Read recommendations:
TK100N- Multi functional GPS Tracker
How to implement GPS monitoring function.trailer gps tracker Solution
GPS positioning logistics solutions Logistics GPS positioning application solutions
Last article:Classification of GPS antenna
Next article:The following aspects mainly affect the performance of GPS antenna
Related Information
real-time gps tracking Manufacturing
2023-04-23vehicle gps tracker wholesale
2023-04-23real-time gps tracking price
2023-04-23gps tracker for bike Factory
2023-04-23OBD GPS Tracker Vendor
2023-03-16Hidden GPS Trackers supplier
2023-04-23car gps tracker
2023-04-11car gps tracker Production
2023-04-23GPS Tracking Manufacturing
2023-04-23real-time gps tracking Factory
2023-04-23GF20-Mini Magnet GPS Tracker
2022-06-21VSL100 GPS Speed Limiter, Speed Governor
2022-06-196000mAh Magnetic Asset GPS Tracker
2025-03-31YG119- Hunting Dog GPS tracker
2023-10-07G02M Pet Tracker
2022-06-19GPS active ranging and passive range.gps tracker no monthly fee Production
2023-04-20The GALILEO GPS system consists of 10 signals in four frequency bands.
2022-10-11GPS cannot use the problem of vehicle power supply.plug & play Obd gps tracker manufacturer
2023-04-12Can the car GPS locator work normally in a special environment?gps tracker no monthly fee manufactur
2023-03-28GPS screen reaction problem.plug & play Obd gps tracker Manufacturing
2023-04-12How to choose the antenna module of the car GPS positioner?Best hidden gps trackers
2023-03-22Centimeter -level high -precision 4G full Netcom GPS positioner.fleet management software webfleet s
2023-03-08How to install and use the Beidou GPS positioner?gps tracker for trailer Manufacturing
2023-04-14Features and functions of in car GPSD
2023-07-27GPS satellites
2022-11-03What are the costs of buying GPS positioner?obd-II port gps tracker manufacturer
2023-04-06How to choose the GPS locator of a car loan?obd2 tracker Manufacturing
2023-03-15GPS system architecture and analysis
2022-09-01mini gps tracker.GPS positioning
2023-11-14Do gps trackers consume data?
2022-09-16