GPS antennas can convert electromagnetic waves emitted by satellites into electric currents. Since GPS signals are circularly polarized waves, all antennas work in a circularly polarized mode. GPS antennas are divided into internal and external antennas according to their locations. Internal antennas can be divided into passive antennas and active antennas. So should we choose active or passive antennas when using them? What is the interface of GPS antennas like? The following professionals will tell you:

1. Passive and active selection of GPS antennas:

(1) If there is an LNA in the chip, it is recommended to use a passive one; if not, an active antenna can be used. The key is whether the antenna input pin of the chip can be fed.

(2) The active antenna is large and can be used as an external antenna. If there are many interference sources on the ground, it is not suitable for application because the antenna has omnidirectional receiving capability and will amplify the signal of the interference source, interfering with the satellite signal.

2. GPS antenna interface:

GPS antenna connector is also called reverse polarity male connector, which means it has internal threads and the contact point in the middle is a needle. This is the most commonly used one. The standard SMA interface is a combination of two devices, one male and one female. If the male interface is internal thread + needle, then the female interface must be external thread + hole soldered on the motherboard (female socket). There is also a type called RP-SMA, which is the opposite of the above. It is external thread + needle, internal thread + hole.

The above is what I want to share today. Nowadays, with the development of electronic technology, GPS antennas are more and more widely used, and these applications affect almost all aspects of modern society, and the number of applications is also increasing. It is mainly used in timing, navigation, positioning, tracking, measurement, etc.