CN214589247U

CN214589247U - 5G-R railway antenna system

Info

Publication number: CN214589247U
Application number: CN202120302755.2U
Authority: CN
Inventors: 董鹏飞; 迟茜
Original assignee: Tianjin Cellular Innovation Communication Technology Co ltd
Current assignee: Tianjin Cellular Innovation Communication Technology Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-11-02
Anticipated expiration: 2031-02-02

Abstract

The utility model relates to a 5G-R antenna technical field discloses a 5G-R railway antenna system, including a plurality of receiving 5G-R antennas, the receiving 5G-R antenna is connected with low noise amplifier, 5G-R radio frequency control module and 5G-R railway module, the low noise amplifier with the 5G-R radio frequency control module is connected, the 5G-R radio frequency control module with the 5G-R railway module is connected; according to the 5G-R railway antenna system, the low-noise amplifier is additionally arranged between the receiving 5G-R antenna and the 5G-R radio frequency control module, so that line loss caused by long distance between the 5G-R radio frequency control module and the 5G-R railway module is made up, and the influence of the line loss on the received signals is eliminated to a greater extent.

Description

5G-R railway antenna system

Technical Field

The utility model relates to a 5G-R antenna technical field, concretely relates to 5G-R railway antenna system.

Background

5G-R, namely 5G for railway, can be translated into 5G mobile communication special for rail transit. The application of the 5G-R technology can greatly improve the informatization and intelligentization level of the railway and promote the upgrading and upgrading of the traditional industry. In the 5G-R railway antenna system in the prior art, a 5G-R railway module is adopted to realize network access, the 5G-R railway module is directly connected with an antenna through a transmission line, the distance between the antenna of a part of carriages and the 5G-R railway module is longer due to the longer length of a railway train, a longer transmission line is needed to transmit signals between the antennas, and the signal loss on the transmission line is larger and can not be ignored at the moment, so that the quality of the received signals is influenced.

SUMMERY OF THE UTILITY MODEL

To the deficiencies of the prior art, an object of the present invention is to provide a 5G-R railway antenna system, which can solve the problem that the line loss between the antenna and the 5G-R railway module is large and affects the quality of the received signal.

In order to achieve the above object, the present invention provides the following technical solutions:

a 5G-R railway antenna system, comprising: the receiving 5G-R antennas are connected with a low-noise amplifier; the low-noise amplifier is connected with the 5G-R radio frequency control module, and the 5G-R radio frequency control module is connected with the 5G-R railway module.

The utility model discloses in, preferred, still include a plurality of receiving and dispatching 5G-R antennas, receiving and dispatching 5G-R antenna connection has the duplexer, the duplexer is connected with low noise amplifier and power amplifier respectively, low noise amplifier and power amplifier respectively with 5G-R radio frequency control module connects.

In the present invention, preferably, a filter is further connected between the low noise amplifier and the 5G-R rf control module, between the power amplifier and the 5G-R rf control module.

In the present invention, preferably, the power amplifier includes a first input matching network, an input stage, an intermediate stage, an output stage, a first output matching network and a first bias circuit, the input matching network is connected to the input stage, the input stage is connected to the intermediate stage through the intermediate stage matching circuit, the intermediate stage is connected to the output stage through the intermediate stage matching circuit, the output stage is connected to the output matching network, and the bias circuit is connected to the input stage, the intermediate stage and the output stage respectively.

The present invention is directed to a low noise amplifier, and more particularly to a low noise amplifier including a second input matching network, a transistor, a second output matching network, and a second bias circuit, wherein the second input matching network is connected to the transistor, the transistor is connected to the second output matching network, and the second bias circuit is connected to the transistor.

The utility model discloses in, it is preferred, first input matching network includes first electric capacity, first inductance and first resistance, one end ground connection behind first inductance and the first resistance parallel connection, the other end with the input of input stage is connected, first electric capacity one end with the input of input stage is connected, and the other end is used for receiving input signal.

The utility model discloses in, it is preferred, interstage matching circuit includes second electric capacity and second inductance, the one end of second electric capacity is connected with the output of preceding one-level, and the other end is connected with the input of back one-level, the one end ground connection of second inductance, the other end is connected with the input of back one-level.

Compared with the prior art, the beneficial effects of the utility model are that:

the 5G-R railway antenna system of the utility model adds the low noise amplifier between the receiving 5G-R antenna and the 5G-R radio frequency control module to compensate the line loss caused by the long distance between the 5G-R radio frequency control module and the 5G-R railway module, and eliminates the influence of the line loss on the received signal to a large extent; by adding the duplexer and the power amplifier, the double-common communication function of the system is realized, the transmitted signal can be gained, the line loss caused by the long distance between the antenna for receiving the signal and the 5G-R railway module can be made up in advance, and the communication quality is improved; the filter is added, so that useless signals can be filtered out, and required signals can be reserved, thereby further improving the quality of the transmitted and received signals and optimizing the communication experience of a user.

Drawings

FIG. 1 is a schematic diagram of a 5G-R railway antenna system according to one embodiment.

Fig. 2 is a schematic structural diagram of another embodiment of a 5G-R railway antenna system.

Fig. 3 is a schematic structural diagram of another embodiment of a 5G-R railway antenna system.

Fig. 4 is a schematic diagram of the structure of a power amplifier in another embodiment of the 5G-R railway antenna system.

Fig. 5 is a circuit diagram of a first output matching network in another embodiment of a 5G-R railway antenna system.

Fig. 6 is a circuit diagram of an interstage matching circuit in another embodiment of a 5G-R railway antenna system.

Fig. 7 is a schematic diagram of a low noise amplifier in another embodiment of the 5G-R railway antenna system.

In the drawings: 1-receiving 5G-R antenna, 2-transceiving 5G-R antenna, 3-5G-R radio frequency control module, 4-5G-R railway module, 5-low noise amplifier, 501-second input matching network, 502-transistor, 503-second output matching network, 504-second bias circuit, 6-power amplifier, 601-first input matching network, 602-input stage, 603-intermediate stage, 604-output stage, 605-first output matching network, 606-first bias circuit, 607-inter-stage matching circuit, 7-duplexer, 8-filter, C1-first capacitor, L1-first inductor, R1-first resistor, C2-second capacitor, L2-second inductor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a preferred embodiment of the present invention provides a 5G-R railway antenna system, which includes a plurality of receiving 5G-R antennas 1, a 5G-R rf control module 3, and a 5G-R railway module 4.

In this embodiment, the rf antenna interface of the 5G-R railway module 4 is connected to the rf input interface of the 5G-R rf control module 3, and transmits the rf signal to the 5G-R rf control module 3. The receiving 5G-R antenna 1 is connected to a low noise amplifier 5 (LNA), and the low noise amplifier 5 is connected to the 5G-R rf control module 3. The 5G-R radio frequency control module 3 adds a low noise amplifier 5 to the receiving 5G-R antenna 1, and compensates the line loss between the receiving 5G-R antenna 1 and the 5G-R railway module 4 by using the gain of the low noise amplifier 5. In this embodiment, the low noise amplifier 5 is added between the receiving 5G-R antenna 1 and the 5G-R radio frequency control module 3, so as to compensate for the line loss caused by the long distance between the 5G-R radio frequency control module 3 and the 5G-R railway module 4, and eliminate the influence of the line loss on the received signal to a large extent.

In a preferred embodiment of the present invention, as shown in fig. 2, the 5G-R railway antenna system further comprises a plurality of transceiving 5G-R antennas 2. The structure of the transmitting and receiving 5G-R antenna 2 is not different from that of the receiving 5G-R antenna 1, but the transmitting and receiving functions are not completely the same because the connected circuit systems are different. The transceiving 5G-R antenna 2 is connected with a duplexer 7, a low noise amplifier 5 and a power amplifier 6 are connected behind the duplexer 7, and the low noise amplifier 5 and the power amplifier 6 are respectively connected with the 5G-R radio frequency control module 3. The duplexer 7 can realize the functions of antenna receiving and transmitting, and realize duplex communication. The low noise amplifier 5 is used for amplifying the received signal, the power amplifier 6 is used for amplifying the signal sent outwards, the purpose of the low noise amplifier is to offset the line loss between the 5G-R radio frequency control module 3 and the 5G-R railway module 4 to a certain extent, the low noise amplifier 5 is used for making up after receiving the signal, and the power amplifier 6 is used for making up in advance before sending the signal. The number of the receiving 5G-R antennas 1 and the transceiving 5G-R antennas 2 is set according to the system requirement, for example, two receiving 5G-R antennas 1 and two transceiving 5G-R antennas 2 can be set, the system can realize a 2Tx4Rx 5G-R antenna system by using four 5G-R antennas and a 5G-R radio frequency control module 3, wherein the low noise amplifier 5, the power amplifier 6 and the duplexer 7 are radio frequency chips, can be integrated on a high frequency PCB, and are provided with four radio frequency input interfaces and four radio frequency output interfaces, and use an arm chip to perform radio frequency control. The 5G frequency bands supported by the antenna system are N1, N41, N78 and N79. The terminal supporting the above four frequency bands is a real 5G terminal for full network communication. Wherein, N1 refers to: uplink 1920-1980MHz, downlink 2110-2170MHz, duplex mode FDD; n41 means: uplink 2496-; n78 means: 3.3-3.8GHz for uplink, 3.3-3.8GHz for downlink, and TDD in duplex mode; n79 means: 4.4-5.0GHz for uplink and 4.4-5.0GHz for downlink, and TDD in duplex mode. The above frequency bands include frequency bands adopted by various operators. In this embodiment, by adding the duplexer 7 and the power amplifier 6, the dual common communication function of the system is realized, and meanwhile, the gain can be performed on the transmitted signal, so that the line loss generated by the antenna receiving the signal due to the long distance between the antenna and the 5G-R railway module 4 can be made up in advance, and the communication quality is improved.

In a preferred embodiment of the present invention, a filter 8 is further connected between the low noise amplifier 5 and the 5G-R rf control module 3, and between the power amplifier 6 and the 5G-R rf control module 3. That is, filters 8 are added between the transceiving 5G-R antennas 2 and the 5G-R railway modules 4, and between the receiving 5G-R antennas 1 and the 5G-R railway modules 4, as shown in fig. 3. The filter 8 is added here, so that useless signals can be filtered out, and required signals can be reserved, thereby further improving the quality of transmitted and received signals and optimizing the communication experience of users.

In a preferred embodiment of the present invention, as shown in fig. 4, the power amplifier 6 is a three-stage amplifier, including a first input matching network 601, a first input stage 602, an intermediate stage 603, an output stage 604, a first output matching network 605 and a first bias circuit 606, the first input matching network 601 is connected to the first input stage 602, the first input stage 602 is connected to the intermediate stage 603 through an intermediate stage matching circuit 607, the intermediate stage 603 is connected to the output stage 604 through an intermediate stage matching circuit 607, the output stage 604 is connected to the first output matching network 605, and the bias circuit is connected to the first input stage 602, the intermediate stage 603 and the output stage 604 respectively. The first input stage 602, the intermediate stage 603, and the output stage 604 are all amplifying circuits, and can implement three-stage amplification of an input signal. To ensure that the power amplifier 6 operates in an optimal state, any load value must be converted into a desired load resistance value operating near the critical state by a matching network comprising a first input matching network 601, an inter-stage matching circuit 607 and a first output matching network 605, which are arranged to match the load impedance of the first input stage 602, the intermediate stage 603 and the output stage 604 to the desired optimal impedance to ensure maximum power transfer to the load. In the embodiment, the three-stage amplifying circuit is arranged, and the input end and the output end of the amplifying circuit are connected with the matching network, so that the transmitted signal is amplified to a greater extent, and the matching network is used for ensuring that the power amplifier 6 works in the optimal state.

In a preferred embodiment of the present invention, as shown in fig. 5, the first input matching network 601 includes a first capacitor C1, a first inductor L1 and a first resistor R1, the first inductor L1 and the first resistor R1 are connected in parallel and then connected to ground at one end, the other end is connected to the input end of the first input stage 602, one end of the first capacitor C1 is connected to the input end of the first input stage 602, and the other end is used for receiving the input signal. The main amplifying element may be a Transistor or a HEMT (High Electron Mobility Transistor 502, which may also be referred to as a two-dimensional Electron gas field effect Transistor 502). The first capacitor C1 is used as a blocking capacitor and an L-type matching network capacitor, and the first resistor R1 and the first inductor L1 are an L-type matching resistor and an inductor. Since the input capacitance of the HEMT varies with the bias voltage, the first inductor L1 is connected in parallel to the gate terminal, which can suppress the variation. The first input matching network 601 of this embodiment can perform impedance transformation through L-type matching of the input matching network, and finally realize amplification of an input signal, and has a simple structure and small passive loss.

In a preferred embodiment of the present invention, as shown in fig. 6, the inter-stage matching circuit 607 includes a second capacitor C2 and a second inductor L2, one end of the second capacitor C2 is connected to the output end of the previous stage, the other end is connected to the input end of the next stage, one end of the second inductor L2 is grounded, and the other end is connected to the input end of the next stage. The previous stage refers to an amplifying stage before the inter-stage matching circuit 607, and may be the first input stage 602 or the intermediate stage 603; the latter stage refers to an amplification stage following the inter-stage matching circuit 607, and may be the intermediate stage 603 or the output stage 604. The second capacitor C2 is used to isolate the positive bias voltage between the two amplifier stages and prevent it from affecting the drain voltage of the HEMT. And the second inductor L2 can reduce the equivalent capacitance seen by the output terminal of the previous stage, thereby improving the voltage transmission efficiency. By providing the inter-stage matching circuit 607 having the above-described configuration, matching among the first input stage 602, the intermediate stage 603, and the output stage 604 can be achieved, and the configuration is simple and the passive loss is small.

In a preferred embodiment of the present invention, as shown in fig. 7, the low noise amplifier 5 includes a second input matching network 501, a transistor 502, a second output matching network 503 and a second bias circuit 504, the second input matching network 501 is connected to the transistor 502, the transistor 502 is connected to the second output matching network 503, and the second bias circuit 504 is connected to the transistor 502. The transistor 502 mainly refers to a transistor and a HEMT, and amplification is performed using such a transistor 502. The second input matching network 501, the second output matching network 503 and the second bias circuit 504 have substantially the same structure and function as the similar parts in the power amplifier 6, and the main difference is that the noise figure is lower than that of a common amplifier, the design method is noise optimal matching, and the gain is reduced to some extent. The low noise amplifier 5 of the above structure can realize low noise amplification of the received signal, and the structure is simple and easy to realize.

The working principle is as follows:

when the 5G-R railway antenna system is used, the receiving 5G-R antenna 1 receives signals sent by other antennas on a train, the signals are amplified by the low-noise amplifier 5, then unnecessary waveforms are filtered by the filter 8, then the signals are transmitted to the 5G-R radio frequency control module 3, and then the signals enter the 5G-R railway module 4 through the transmission line, the influence of line loss on the signals is greatly eliminated due to the gain of the low-noise amplifier 5, and the signal quality is high. The transceiving 5G-R antenna 2 can achieve that the receiving 5G-R antenna 1 obtains a high-quality signal through receiving and amplifying processes, and can also send the signal outwards, the signal is amplified by the power amplifier 6 before being sent and then sent out, after being received by other antennas, some line loss can be caused due to the fact that the distance between the 5G-R radio frequency control module 3 and the 5G-R railway module 4 is long, but due to the fact that the signal is amplified in advance, the generated line loss cannot cause overlarge influence on the signal quality, and the signal quality is still high. Through the process, the 5G-R railway antenna system realizes the function of simultaneously receiving and transmitting and receiving signals independently.

The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.

Claims

1. A 5G-R railway antenna system, comprising:

the receiving 5G-R antennas are connected with a low-noise amplifier;

the low-noise amplifier is connected with the 5G-R radio frequency control module, and the 5G-R radio frequency control module is connected with the 5G-R railway module;

the antenna system also comprises a plurality of transceiving 5G-R antennas, wherein the transceiving 5G-R antennas are connected with duplexers, the duplexers are respectively connected with a low-noise amplifier and a power amplifier, and the low-noise amplifier and the power amplifier are respectively connected with the 5G-R radio frequency control module;

filters are also connected between the low-noise amplifier and the 5G-R radio frequency control module and between the power amplifier and the 5G-R radio frequency control module;

the power amplifier comprises a first input matching network, an input stage, an intermediate stage, an output stage, a first output matching network and a first bias circuit, wherein the first input matching network is connected with the input stage, the input stage is connected with the intermediate stage through an intermediate stage matching circuit, the intermediate stage is connected with the output stage through an intermediate stage matching circuit, the output stage is connected with the first output matching network, and the bias circuit is respectively connected with the input stage, the intermediate stage and the output stage.

2. The 5G-R railway antenna system according to claim 1, wherein the first input matching network comprises a first capacitor, a first inductor and a first resistor, the first inductor and the first resistor are connected in parallel, one end of the first inductor is connected to ground, the other end of the first inductor is connected to the input end of the input stage, one end of the first capacitor is connected to the input end of the input stage, and the other end of the first capacitor is used for receiving an input signal.

3. The 5G-R railway antenna system according to claim 1, wherein the inter-stage matching circuit comprises a second capacitor and a second inductor, one end of the second capacitor is connected with the output end of the previous stage, the other end of the second capacitor is connected with the input end of the next stage, one end of the second inductor is grounded, and the other end of the second inductor is connected with the input end of the next stage.

4. The 5G-R railway antenna system of claim 1, wherein the low noise amplifier comprises a second input matching network, a transistor, a second output matching network, and a second bias circuit, the second input matching network connected to the transistor, the transistor connected to the second output matching network, and the second bias circuit connected to the transistor.