With the successful launch of the first Beidou antenna, more and more industries are now using Beidou antennas. Currently, the most widely used is ceramic antennas, which are also known as close range antennas due to their reading distance of about 2m. The antenna gain is 2dbi, and 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 ceramic antennas after buying them. Last time, we shared the structural design of ceramic antennas with you. Today, our technicians will teach you how to distinguish the positive and negative poles of ceramic antennas:

Method 1:

Use a multimeter with a voltage range of 0 to 3 volts DC, which can display positive and negative values. Connect the red and black probes to the two electrodes of the piezoelectric ceramic plate, and then press the ceramic plate with force (apply pressure in the direction of both electrodes) to see if the multimeter shows a positive or negative value (usually a change in value, which will also change depending on whether the initial value is positive or negative). If the initial value is positive, then the electrode connected to the red probe is positive. This method is prone to errors, it is recommended to test it multiple times.

Method 2:

To test with a quasi-static d33 tester, you need to know whether the value measured when the positive pole is facing up is positive or negative, and then judge based on the test results (personal experience: if the measured value is positive, it means the positive pole is facing up. We cannot guarantee that it is suitable for testing with all models of quasi-static d33 testers)

Method 3:

Place the porcelain plate on top of the thin metal plate, and connect the red probe of the U-A multimeter pin to the porcelain surface and the black probe to the metal surface. Use your fingers to press down on the porcelain surface and reverse the needle. Connect the red probe to the porcelain surface as the positive electrode and the black probe to the metal plate as the negative electrode.

Have you learned how to distinguish the positive and negative poles of a ceramic antenna today? Only by distinguishing the positive and negative poles of a ceramic antenna can it work properly. The larger the area of the ceramic plate, the higher the dielectric constant, the higher the resonance frequency, and the better the reception effect. Ceramic plates are mostly designed in a square shape to ensure that resonance is basically consistent in the XY direction, thereby achieving uniform star reception.