With the successful launch of the first Beidou antenna, more and more industries are beginning to use Beidou antennas. The most widely used one is the ceramic antenna. The ceramic antenna is also called a short-range antenna because its reading distance is close to about 2m. The antenna gain is 2dbi. It is an industrial-grade product for indoor use. It uses a ceramic shell and has anti-interference, anti-lightning, waterproof and dustproof capabilities. It is mainly used in the personnel management industry. However, many people do not know how to distinguish the positive and negative poles of the ceramic antenna after buying it. Last time, I shared the structural shape of the ceramic antenna. Today, the technicians will teach you how to distinguish the positive and negative poles of the ceramic antenna:

Method 1:

Use the voltage range of the multimeter, 0 to 3 volts DC voltage range, which can display positive and negative values. Connect the red and black test leads to the two electrodes of the piezoelectric ceramic sheet, and then press the ceramic sheet hard (pressurize the two electrode directions) to see whether the value on the multimeter is positive or negative (generally it shows a changing value, and the positive and negative will also change. It depends on whether the initial value is positive or negative). If it is positive at the beginning, the electrode connected to the red test lead is the positive pole. This method is prone to errors, and it is recommended to measure it several times.

Method 2:

Use the quasi-static d33 tester to test. You need to know whether the value measured when the positive pole is facing upward is positive or negative, and then judge according to the test results (personal experience: the measured value is positive, that is, the positive pole is facing upward. It is not guaranteed to be suitable for all models of quasi-static d33 testers)

Method 3:

Put the ceramic piece on the thin metal plate, and the bottom should be soft. Use the sub-needle multimeter uA gear red probe to connect the ceramic surface, and the black probe to the metal surface. Press the ceramic surface sub-needle with your finger to reverse the bias. The red probe is connected to the ceramic surface as the positive pole, and the black probe is connected to the metal plate as the negative pole.

How to distinguish the positive and negative poles of the ceramic antenna? Have you learned it today? Distinguishing the positive and negative poles of the ceramic antenna can make it work normally. The larger the area of the ceramic piece, the larger the dielectric constant, the higher its resonant frequency, and the better the receiving effect. Most ceramic pieces are square designs to ensure that the resonance in the XY direction is basically consistent, so as to achieve the effect of uniform satellite reception.