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Low passive intermodulation broadband direct current blocking device

A technology of passive intermodulation and DC blocker, which is applied in the direction of waveguide devices, electrical components, circuits, etc., can solve the problems of interfering with the normal operation of the base station communication system, poor passive intermodulation signals, etc., and achieve good passive intermodulation indicators, enhanced security, and reduced effects of external sources of interference

Active Publication Date: 2016-11-02
斯必能通讯器材(上海)有限公司
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AI Technical Summary

Problems solved by technology

When a strong induced voltage is formed in the tunnel space and acts on the DC blocker, the ceramic material will produce a poor passive intermodulation signal, which will enter the base station along the cable connection and interfere with the normal operation of the base station communication system

Method used

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  • Low passive intermodulation broadband direct current blocking device

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Embodiment Construction

[0009] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0010] like figure 1 As shown, a low passive intermodulation broadband DC blocker provided by the present invention includes two inductors 1 , two capacitors 2 , one capacitor 3 , and one capacitor 4 , excluding signal source 5 and matching load 6 . According to the index required by the customer, the values ​​of the inductance 1, the capacitance 2, the capacitance 3 and the capacitance 4 are respectively obtained by using the circuit model simulation of the present invention.

[0011] The following describes the equivalent of capacitor 1, capacitor 2, capacitor 3, and capacitor 4 in the three-dimensional electromagnetic simulation design. Inductor 1 is a coil wound with a specific number of turns. The specific number of turns and the inner diameter of the coil are obtained by circuit simulation according to the electrical perfo...

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Abstract

The invention relates to a low passive intermodulation broadband direct current blocking device characterized by comprising two series circuits which are respectively defined as a first series circuit and a second series circuit, each series circuit comprises inductors that are connected in series and a first capacitor formed between an internal conductor and an outer conductor that are arranged on the same side, one end of the first series circuit is connected with one end of a second capacitor formed by internal conductors that are respectively arranged on a left end and a right end, the other end of the second capacitor is connected with one end of the second series circuit, the other end of the first series circuit is connected with one end of a third capacitor formed by outer conductors that are respectively arranged on a left end and a right end, and the other end of the third capacitor is connected with the other end of the second series circuit. The low passive intermodulation broadband direct current blocking device is advantaged by electrical performance indexes of a broadband, low standing-wave ratio, low insertion loss, good passive intermodulation indexes, small physical dimensions and high insulating properties.

Description

technical field [0001] The invention relates to a low passive intermodulation broadband DC blocker, which belongs to the supporting technical field of mobile communication systems. Background technique [0002] In order to meet the field strength coverage requirements of the wireless communication network in the long tunnels of railways and subways, a large number of leaky cables are used in the tunnels. When the electric locomotive passes, the large traction current forms an electromagnetic field in the tunnel space, and a strong induced voltage will be generated on the outer conductor of the leaky cable a few meters away from the catenary, which is enough to burn the communication facilities or cause casualties. In order to avoid such safety problems, in the design and construction of the leaky cable, a DC blocker is connected between the leaky cable and the base station equipment to block the induced voltage generated by the catenary on the leaky cable from connecting to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/36
CPCH01P1/36
Inventor 徐锋明沃尔夫冈
Owner 斯必能通讯器材(上海)有限公司
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