CN102170093A - Lightning arrester of broadband gas discharge tube - Google Patents

Abstract

The invention discloses a lightning arrester of a broadband gas discharge tube, which is characterized in that a hollow rectangle metal shell is respectively provided with two 50ohm-characteristic-impedance coaxial interfaces with the same structure opposite to two sides; two ends of a cable core are respectively connected with an impedance conversion node; the two impedance conversion nodes are respectively supported by each Teflon medium ring; one Teflon medium ring is supported in an impedance interface hole with the 50ohm characteristic impedance at the left side of the hollow rectangle metal shell, and the other Teflon medium ring is supported in an impedance interface hole with 50ohm characteristic impedance at the right side of the hollow rectangle metal shell; and one end of the gas discharge tube is contacted with the cable core, and the other end of the gas discharge tube is connected with the hollow rectangle metal shell by a round metal nut. The lightning arrester is simple in structure, convenient to manufacture and debug, wide in working band, low in insertion damage, long in service life and high in reliability, and can be applied to occasions of lightning protection in 2G/3G communication base stations.

Description

Broadband gas discharge tube lightning protection device

technical field

The invention relates to a lightning arrester, in particular to a broadband gas discharge tube lightning arrester.

Background technique

With the rapid development of wireless communication systems, the popularization and development of 2G and 3G communication networks have gradually changed people's lives and promoted the development of social economy. Our country has two of the largest GSM networks in the world. Because IMT-2000 is 3G, there are three mainstream standard technologies of WCDMA, CDMA2000 and TD-SCDMA with our country's complete independent intellectual property rights, and these three standards will be adopted in our country , so in 3G construction, it is inevitable that GSM/CDMA or 2G/3G networks will coexist. The average station distance in some areas of the existing network is as follows: 500m to 600m in dense urban areas; 1.1km to 1.2km in general urban areas; 1.8km to 2.0km in suburban areas; 2.0km to 2.5km for expressways; 1.4km for national highways ~1.5km. These data are the overall statistical average analysis results of station distances in some areas of our country, and have certain representative significance. Therefore, with the evolution and promotion of the 3G system, the base station system and equipment will have a huge upgrade demand within a few years. The lightning protection of communication base stations is an unavoidable problem. Broadband gas discharge tube arresters are widely used in the lightning protection of letter base stations.

At present, the existing mature products of lightning arresters are only products applied in the 2G GSM frequency band. Within the range covered by the working frequency band, the performance of bandwidth, standing wave ratio, insertion loss and other properties cannot meet the requirements of the current 2G/3G communication compatible system for broadband lightning arresters.

Contents of the invention

The purpose of the present invention is to provide a broadband gas discharge tube lightning protection device, especially suitable for the lightning protection requirements of 2G/3G communication base stations.

The technical solution adopted by the present invention to solve its technical problems is as follows:

The invention comprises a hollow rectangular metal shell, two 50-ohm characteristic impedance coaxial interfaces with the same structure, two Teflon dielectric rings, two impedance transformation junctions, cable cores, gas discharge tubes and circular metal nuts; hollow Two 50-ohm characteristic impedance coaxial interfaces with the same structure are installed on the opposite sides of the rectangular metal shell. The two ends of the cable core are respectively connected to impedance transformation junctions. The Teflon dielectric ring is supported in the 50 ohm characteristic impedance interface hole near the left side of the hollow rectangular metal casing, and the other Teflon dielectric ring is supported in the 50 ohm characteristic impedance interface hole near the right side of the hollow rectangular metal casing, and the gas discharge One end of the tube is in contact with the cable core, and the other end of the gas discharge tube is connected with a hollow rectangular metal shell through a round metal nut.

The material of the hollow rectangular metal casing is copper, and the gas discharge tube is a diode.

The beneficial effects that the present invention has are:

The present invention has simple overall structure, convenient production and debugging, low production cost, small volume, wide bandwidth, small insertion loss, small standing wave ratio, long life, high reliability, easy replacement, replaceable gas discharge tube, and The inner conductor can be powered by DC and so on. A gas discharge tube is installed between the inner and outer conductors of the gas discharge tube lightning protection device in use. When a strong electromagnetic pulse appears on the transmission line, the gas discharge tube will be turned on (gas breakdown discharge), and the electromagnetic pulse energy will pass through the connection with the outer conductor. The grounding device is released, so that the equipment connected to the other end of the arrester is protected, especially suitable for the current 2G/3G communication base station lightning protection applications.

Description of drawings

Figure 1 is a front view of the overall appearance of the present invention.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Fig. 3 is a B-B sectional view of Fig. 1 .

In the figure: 1. Hollow rectangular metal shell, 2. 50 ohm characteristic impedance coaxial interface, 3. Teflon dielectric ring, 4. Impedance transformation junction, 5. Cable core, 6. Impedance transformation junction, 7. Teflon Long dielectric ring, 8, 50 ohm characteristic impedance coaxial interface, 9, gas discharge tube, 10, round metal nut.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention comprises a hollow rectangular metal shell 1, two 50 ohm characteristic impedance coaxial interfaces 2,8 with the same structure, two Teflon dielectric rings 3,7, two Impedance transformation junctions 4, 6, cable core 5, gas discharge tube 9 and circular metal nut 10; two opposite sides of the hollow rectangular metal shell 1 are equipped with two 50-ohm characteristic impedance coaxial interfaces 2, 8 with the same structure , the two ends of the cable core 5 are respectively connected to impedance transformation junctions 4 and 6, and the two impedance transformation junctions 4 and 6 are respectively supported by respective Teflon dielectric rings 3 and 7, and a Teflon dielectric ring 3 is supported near the hollow rectangular In the hole 2 of the 50 ohm characteristic impedance interface on the left side of the metal shell 1, another Teflon dielectric ring 7 is supported in the 8 hole of the 50 ohm characteristic impedance interface near the right side of the hollow rectangular metal shell 1, one end of the gas discharge tube 9 and the cable The cable cores 6 are in contact with each other, and the other end of the gas discharge tube 9 is connected to the hollow rectangular metal shell 1 through a round metal nut 10 .

The material of the hollow rectangular metal casing 1 is copper, and the gas discharge tube 8 is a diode.

The broadband gas discharge tube arrester has two ports, respectively P1 and P2, and the two ports P1 and P2 can choose N, BNC, F, TNC, SMA, 7/16 and other common interfaces with 50 ohm characteristic impedance form.

The working frequency band covers a frequency range of DC~3.15GHz, covering domestic mainstream 2G and 3G wireless communication frequency bands such as GSM, TDS-CDMA, and WCDMA.

By designing a suitable impedance transformation junction, good electrical performance such as low standing wave ratio and low insertion loss in a wide frequency band can be achieved.

As shown in Figure 2 and Figure 3, the broadband gas discharge tube coaxial lightning protection device of the present invention is designed to calculate the length and width of the metal inner conductor used in the impedance change junction 4 and impedance transformation junction 6 through transmission line theory, thereby ensuring that it can cover 800 -1000 MHz, 1700-2200 MHz two 2G working frequency bands, at the same time, it can also meet the band-pass characteristics of the 2300-2500 MHz 3G frequency band.

Claims (2)

1. broadband gas discharge tube lightning arrester, it is characterized in that: comprise hollow, rectangular metal shell (1), two 50 Europe characteristic impedance coaxial interfaces (2,8) that structure is identical, two Teflon dielectric rings (3,7), two impedance conversion knots (4,6), cable conductor (5), gas discharge tube (9) and circular metal nut (10); Hollow, rectangular metal shell (1) respectively is equipped with two 50 Europe characteristic impedance coaxial interfaces (2 that structure is identical in both sides relatively, 8), the two ends of cable conductor (5) connect impedance conversion knot (4 respectively, 6), two impedance conversion knots (4,6) respectively by Teflon dielectric ring (3 separately, 7) support, a Teflon dielectric ring (3) is supported near in 50 Europe characteristic impedance interface (2) holes on the left of the hollow, rectangular metal shell (1), another Teflon dielectric ring (7) is supported near in 50 Europe characteristic impedance interface (8) holes on hollow, rectangular metal shell (1) right side, gas discharge tube (9) one ends and cable conductor (6) contact, and gas discharge tube (9) other end links to each other with hollow, rectangular metal shell (1) by circular metal nut (10).

2. broadband according to claim 1 gas discharge tube lightning arrester is characterized in that: hollow, rectangular metal shell (1) material is a copper, and gas discharge tube (8) is a diode.

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