Antenna feeder lightning arrester , also known as antenna feeder signal surge protector, antenna feeder lightning arrester and antenna feeder line lightning arrester, is mainly used for lightning protection of feeder. It is suitable for lightning surge protection of coaxial antenna feed signals such as wireless communication, mobile base station, microwave communication, radio and television. Generally divided into two categorie
Switch-type antenna feed surge protection
(1) Scope of application
The switch-type antenna feed surge protector is used to prevent the damage to the antenna and transceiver equipment caused by the induced lightning overvoltage of the feeder. It is applicable to the lightning surge protection of coaxial antenna feed signals such as wireless communication, mobile base station, microwave communication, radio and television, and is installed in the lightning protection zone LPZOA-1 and subsequent zones.
(2) Working principle
Its working principle is that when there is no instantaneous overvoltage, it presents high impedance, but once it responds to the lightning instantaneous overvoltage, its impedance will suddenly change to a low value, allowing the lightning current to pass through. When used as such devices, the devices include: discharge gap, gas discharge tube, thyristor, etc., which are usually used in a wide frequency, such as 0~2.4GHz
Its main working principle and technical
Straight type, 1/4 λ Type antenna feed surge protector
(1) Scope of application
DR-... L series product antenna feed surge protector adopts "1/4 λ” The filtering principle of is used to prevent the damage to the antenna and transceiver equipment caused by the induced lightning overvoltage of the feeder. It is applicable to various antenna communications, mobile base stations, and microwave communications. It is mainly applicable to the following systems: wireless transmission of control signals, protection of receiving equipment, protection of satellite television receiving equipment, protection of wireless transmission of monitoring signals, and protection of receiving equipment. It is applicable to lightning protection of various RF signal receiving and transmitting systems, wireless transmission of network signals and protection of interface equipment. Lightning protection zone LPZOA-I and subsequent zones
(2) Working principle
1/4 wavelength (1/4 λ） High-frequency coaxial lightning arrester is a new type of lightning arrester, which is widely used in radio equipment with relatively high frequency and relatively fixed frequency band, such as 800MHz, 900MHz, 1.8GHz, 2.4GHz, etc. Its main advantage is that the lightning protection effect is obvious, and the impact current resistance can easily reach 8/20 µ s wave above 30KA. Low insertion loss of signal, λ/ The high-frequency coaxial lightning arrester can also greatly control the interference of different frequencies. These characteristics are related to its unique principle and structure.
1/4 λ High-frequency coaxial lightning arrester is designed according to the standing wave theory in the antenna feeder and the spectrum of lightning wave. Its interior is mainly a short circuit bar at the end of 1/4 wavelength of the signal frequency. After the signal is sent out, a part of the wave will be reflected back because the impedance is not completely matched. This part of the reflected wave and the original incident wave will be superimposed to form a standing wave. The amplitude of standing wave at each point of the line is relatively fixed. yes λ/ For the transmission line with short circuit at the end, the current is the maximum and the voltage is the minimum because of short circuit at the end, while for the signal end, the difference is λ/ 4. The voltage is the largest and the current is the smallest, the impedance is the largest, close to the open circuit, so the loss is very small. But for lightning wave, because of its wide spectrum range, and most of the energy is concentrated in the frequency band below 10kHz. Therefore, the gold-plated short circuit rod is not λ/ 4, but approximate to short circuit. Therefore, lightning wave will not invade the equipment and cause damage. For interference signals with different ratings, the short-circuit bar is not equal to its λ/ 4. Therefore, it will cause great loss, thus reducing interference. In order to ensure accuracy, it is often necessary to carefully adjust the length, so a short circuit adjusting screw is set at the top of the short circuit bar. After the lightning arrester is completed, it should be adjusted one by one with high-frequency signal source and high-frequency power to ensure the minimum insertion loss.