CN213637741U

CN213637741U - Transmission bandwidth synthesis circuit based on LTE communication module

Info

Publication number: CN213637741U
Application number: CN202022799683.5U
Authority: CN
Inventors: 赵云龙; 王智超; 张青平
Original assignee: Tianjin 712 Communication and Broadcasting Co Ltd
Current assignee: Tianjin 712 Mobile Communication Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-07-06
Anticipated expiration: 2030-11-27

Abstract

The utility model relates to a transmission bandwidth synthetic circuit based on LTE communication module, the SIM interface and the SIM card I of LTE communication module I are connected, the SIM interface and the SIM card II of LTE communication module II are connected, 2 input ends of 3dB electrical bridge I are received respectively to the main antenna port of LTE communication module I and LTE communication module II, the output of 3dB electrical bridge I is the main antenna end after LTE communication module I and the bandwidth of LTE communication module II are synthesized; diversity antenna ports of the LTE communication module I and the LTE communication module II are connected to 2 input ends of the 3dB electric bridge II, and the output of the 3dB electric bridge II is the diversity antenna end after the bandwidths of the LTE communication module I and the LTE communication module II are synthesized; the working bandwidths of the LTE communication module I and the LTE communication module II are respectively 20MHz, so that the working bandwidth of the whole system reaches 40 MHz; the working bandwidth can be increased to 2 times.

Description

Transmission bandwidth synthesis circuit based on LTE communication module

Technical Field

The utility model relates to an electronic circuit field particularly, relates to a transmission bandwidth synthetic circuit based on LTE communication module for railcar and ground wireless communication, transmission passenger information and train control information.

Background

Modern LTE communication widely uses a private network module based on a Mini PCI Express interface (i.e., a PCIE interface) to implement digital communication between a mobile device and a ground fixed device. The working bandwidth of a general private network module is up to 20MHz, and there is some room for increasing the amount of transmission data, so it is necessary to find a method capable of extending the communication bandwidth of the LTE system to solve the above problems.

Disclosure of Invention

In view of the not enough of the biggest work bandwidth of current private network module, the utility model provides a transmission bandwidth synthetic circuit based on LTE communication module has solved the not enough problem of LTE private network module bandwidth well. The utility model aims at providing a method of expanded bandwidth to the communication system of most use private network module.

The utility model discloses a realize above-mentioned purpose, the technical scheme who adopts is: a transmission bandwidth synthesis circuit based on LTE communication module characterized in that: the system comprises an LTE communication module I, an LTE communication module II, an SIM card I, an SIM card II, a 3dB bridge I and a 3dB bridge II;

an SIM interface of the LTE communication module I is connected with an SIM card I, and the working frequency band of the LTE communication module I is determined by the number of the SIM card I;

the SIM interface of the LTE communication module II is connected with the SIM card II, and the working frequency band of the LTE communication module II is determined by the number of the SIM card II;

writing numbers for the SIM card I and the SIM card II respectively by using a computer;

main antenna ports of the LTE communication module I and the LTE communication module II are respectively connected to 2 input ends of the 3dB bridge I, and the output of the 3dB bridge I is a main antenna end after the bandwidths of the LTE communication module I and the LTE communication module II are synthesized;

diversity antenna ports of the LTE communication module I and the LTE communication module II are connected to 2 input ends of the 3dB electric bridge II, and the output of the 3dB electric bridge II is the diversity antenna end after the bandwidths of the LTE communication module I and the LTE communication module II are synthesized;

the working bandwidths of the LTE communication module I and the LTE communication module II are respectively 20MHz, and then the working bandwidth of the whole system reaches 40 MHz.

The utility model has the advantages that: the LTE communication system uses 2 LTE communication modules, a main antenna port of each LTE communication module is combined into a main antenna port of the whole communication system through a 3dB electric bridge I, a diversity antenna port of each LTE communication module is combined into a diversity antenna port of the whole communication system through a 3dB electric bridge II, the working bandwidth of each LTE communication module is 20MHz, and the working bandwidth of the whole system reaches 40 MHz.

Drawings

FIG. 1 is a schematic diagram of the circuit connection of the present invention;

fig. 2 is the schematic diagram of the LTE communication module structure of the present invention.

Detailed Description

As shown in fig. 1 and 2, a transmission bandwidth synthesis circuit based on an LTE communication module includes an LTE communication module i, an LTE communication module ii, an SIM card i, an SIM card ii, a 3dB bridge i, and a 3dB bridge ii;

the LTE communication module I is connected with the SIM card I through an SIM interface of the LTE communication module I, and the working frequency band of the LTE communication module I is determined by the written number of the SIM card I;

connecting an LTE communication module II with an SIM card II through an SIM interface of the LTE communication module II, wherein the working frequency band of the LTE communication module II is determined by the written number of the SIM card II;

respectively connecting main antenna ports of an LTE communication module I and an LTE communication module II to 2 input ends of a 3dB bridge I, wherein the output of the 3dB bridge I is a main antenna end formed by combining the bandwidths of the LTE communication module I and the LTE communication module II, namely a main antenna port of a communication system;

and respectively connecting diversity antenna ports of the LTE communication module I and the LTE communication module II to 2 input ends of a 3dB electric bridge II, wherein the output of the 3dB electric bridge II is the diversity antenna end after the bandwidths of the LTE communication module I and the LTE communication module II are synthesized, namely the diversity antenna port of the communication system.

A method for realizing a transmission bandwidth synthesis circuit based on an LTE communication module comprises the following steps:

the method comprises the following steps that 2 LTE communication modules, namely an LTE communication module I and an LTE communication module II, are used in an LTE communication system, and main antenna ports of the LTE communication module I and the LTE communication module II are combined into a main antenna port of the whole communication system through a 3dB electric bridge I; combining the diversity antenna ports of the LTE communication module I and the LTE communication module II into a diversity antenna port of the whole communication system by using a 3dB electric bridge II; the working bandwidths of the LTE communication module I and the LTE communication module II are respectively 20MHz, and then the working bandwidth of the whole system reaches 40 MHz.

Claims

1. A transmission bandwidth synthesis circuit based on LTE communication module characterized in that: the system comprises an LTE communication module I, an LTE communication module II, an SIM card I, an SIM card II, a 3dB bridge I and a 3dB bridge II;