With the development of GPS, the market demand for GPS antenna is increasing, not only in professional or commercial fields, such as transportation fleet, scientific and technological exploration and military tracking, but also in many consumer products, such as mobile phones and personal data assistant (PDA) devices. GPS antenna occupies a very important position. The function of GPS antenna is to convert the electromagnetic wave energy of radio signal from satellite into the current that can be absorbed by receiver electronic devices. The size and shape of antenna are very important, because these characteristics determine the ability of antenna to obtain weak GPS signal. But what is its function?

The first function: it is used to capture satellites and receive satellite positioning information, that is, radiate and receive electromagnetic waves; As long as there is no electromagnetic radiation from the surrounding space or circuit, any high-frequency electromagnetic wave can be received more or less completely. According to the difference of GPS antenna, it can be divided into flat antenna and spiral antenna. Spiral antenna has stronger star finding ability rather than mobile phone signal.

The second function: convert the electromagnetic wave energy of the radio signal from the satellite into the current that can be absorbed and applied by the receiving electronic equipment, that is, energy conversion; Generally, for special equipment or on-board equipment, due to the certain distance between the equipment and the GPS receiving module, the disconnection of more than 1m may be used in the actual environment; However, because the feeder has great loss to the signal, the active GPS antenna can only be selected in this case.

There are two main functions of GPS antenna. The size and shape of GPS antenna will affect its performance. Therefore, when purchasing, we should consider the two factors of antenna size and shape. As the most important receiving component in GPS equipment, GPS antenna plays the role of our "ear", so its performance will directly affect the product quality of the whole GPS machine. GPS antenna has four important parameters: gain, standing wave, noise figure and axis ratio. Most GPS antennas are right-handed polarized ceramic media, and their components are ceramic antenna, low-noise signal module, cable and connector.

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