The first function is to capture satellites and receive satellite positioning information, that is, to radiate and receive electromagnetic waves; any high-frequency circuit, as long as it is not completely shielded, can more or less radiate electromagnetic waves into the surrounding space. or receive electromagnetic waves more or less from the surrounding space. 

According to the difference of GPS antenna, it can be divided into plate antenna and spiral antenna, and the spiral antenna has stronger ability to search stars. 

It's not a cell phone signal. 

The second function: to convert the electromagnetic wave energy of the radio signal from the satellite into the current that can be absorbed by the receiver electronic devices, that is, energy conversion; usually for special equipment or vehicle equipment, because there is often a certain distance between the equipment and the GPS receiver module, a broken line of more than 1 meter may be used in the real environment. 

However, because the feeder has a lot of loss to the signal, we can only choose the active GPS antenna in this case. 

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So we should learn to buy GPS antenna tips, because GPS antenna as the most important receiving component of GPS equipment, plays a role equivalent to our "ears", so its performance will be directly related to the product quality of the GPS machine.