CN110661074B - 4T4R symmetrical antenna system and multi-input multi-output power balancing method - Google Patents
4T4R symmetrical antenna system and multi-input multi-output power balancing method Download PDFInfo
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- CN110661074B CN110661074B CN201910775912.9A CN201910775912A CN110661074B CN 110661074 B CN110661074 B CN 110661074B CN 201910775912 A CN201910775912 A CN 201910775912A CN 110661074 B CN110661074 B CN 110661074B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/007—Details of, or arrangements associated with, antennas specially adapted for indoor communication
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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Abstract
The invention discloses a multi-input multi-output power balancing method of a 4T4R symmetrical antenna system, which comprises the following steps: the system comprises a symmetrical four-path transmission and power equalization module and a symmetrical four-path broadband antenna module, wherein the symmetrical four-path transmission and power equalization module is used for generating a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and in phase and sending the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the symmetrical four-path broadband antenna module; the symmetrical four-path broadband antenna module is used for receiving a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal and sending a first radiation signal, a second radiation signal, a third radiation signal and a fourth radiation signal. The invention forms four paths of radiation signals with consistent amplitude and phase and coverage range in space, so that the mobile terminal can receive four paths of radiation signals with equal amplitude and the like when moving in the signal coverage range, and good indoor coverage effect is realized.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a 4T4R symmetrical antenna system and a multi-input multi-output power balancing method.
Background
With the development of mobile communication technology, Multiple-Input Multiple-output (MIMO) technology has been applied to various mobile communication systems to increase system capacity, such as: a Long Term Evolution (LTE) system, a Wideband Code Division Multiple Access (WCDMA) system, and the like.
As indoor communication traffic is heavier and heavier, it is very necessary to apply MIMO in an indoor mobile communication system. At present, a 4T4R symmetric antenna system and a MIMO power equalization method using MIMO mainly receive four equal-amplitude equal-frequency radio frequency signals through a symmetric four-path broadband antenna and then send four equal-amplitude in-phase radiation signals, thereby providing four equal-amplitude in-phase radiation signals for a mobile terminal in an indoor space. However, due to the structural process and quality limitations of the original indoor coverage system, coverage ranges, amplitudes and phases of four paths of radiation signals transmitted from the same point are inconsistent, so that the mobile terminal can only receive four paths of radio frequency signals with uneven amplitudes under the coverage of signals in the same area in the moving process, and the receiving effect is poor and the MIMO application effect is poor.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a 4T4R symmetric antenna system and a multi-input multi-output power equalization method, and the four paths of radio frequency signals which are processed and sent by a plurality of power equalization modules through a symmetric four-path broadband microstrip array antenna and have equal amplitude and equal frequency and a phase difference of 0 degree are sent, so that four paths of radiation signals with consistent amplitude and phase and a consistent coverage range are formed in the space along the four paths of transmission directions, and a mobile terminal can receive the four paths of radiation signals with equal amplitude and equal phase when moving in a signal coverage range, thereby having a good receiving effect.
The technical scheme adopted by the invention is as follows:
A4T 4R symmetrical antenna system comprises a symmetrical four-path transmission and power balancing module and a symmetrical four-path broadband antenna module, wherein the symmetrical four-path broadband antenna module comprises a first path of radiating antenna, a second path of radiating antenna, a third path of radiating antenna and a fourth path of radiating antenna which are the same in size and are parallel to each other in position, and the first path of radiating antenna, the second path of radiating antenna, the third path of radiating antenna and the fourth path of radiating antenna are respectively connected with the symmetrical four-path transmission and power balancing module;
the symmetrical four-path transmission and power equalization module is used for generating a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which have equal amplitude, equal frequency and same phase and sending the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the symmetrical four-path broadband antenna module;
the symmetrical four-path broadband antenna module is used for receiving the first radio frequency signal and sending a first radiation signal through the first path of radiation antenna, receiving the second radio frequency signal and sending a second radiation signal through the second path of radiation antenna, receiving the third radio frequency signal and sending a third radiation signal through the third path of radiation antenna, and receiving the fourth radio frequency signal through the fourth path of radiation antenna and sending a fourth radiation signal.
The system receives four paths of radio frequency signals which are processed and sent by the power equalization modules through the symmetrical four paths of broadband microstrip array antennas, have the same amplitude and the same frequency and have the phase difference of 0 degree, and then sends the radiation signals, so that four paths of radiation signals which have the same amplitude and phase and the same coverage range are formed in space, the mobile terminal can receive the four paths of radiation signals which have the same amplitude and the same phase when moving in a signal coverage range, and the receiving effect is good.
Further, the symmetrical four-path transmission and power balancing module comprises a 4T4R small base station and a power balancing module, the 4T4R small base station is connected with the power balancing module, and the power balancing module is respectively connected with the first path of radiation antenna, the second path of radiation antenna, the third path of radiation antenna and the fourth path of radiation antenna;
the 4T4R small cell is used for generating a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal with equal amplitude and equal frequency, and sending the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the power balancing module;
the power balancing module is configured to perform power distribution on the received first radio frequency signal, second radio frequency signal, third radio frequency signal, and fourth radio frequency signal, so that a phase difference between the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal is 0 degree, and simultaneously send the first radio frequency signal to the first path of radiating antenna, send the second radio frequency signal to the second path of radiating antenna, send the third radio frequency signal to the third path of radiating antenna, and send the fourth radio frequency signal to the fourth path of radiating antenna.
The power equalization module is used for carrying out phase processing on the radio frequency signals, so that the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal in frequency, equal in amplitude and same in phase, and four paths of radio frequency signals with consistent amplitude and phase and consistent in coverage range are formed in space.
Further, the power equalization module comprises a radio frequency power equalizer, a first feeder line, a second feeder line, a third feeder line and a fourth feeder line;
the radio frequency power equalizer is connected with the first path of radiating antenna through the first feeder line, connected with the second path of radiating antenna through the second feeder line, connected with the third path of radiating antenna through the third feeder line, and connected with the fourth path of radiating antenna through the fourth feeder line;
the radio frequency power equalizer is configured to transmit the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal, and control the power and the phase of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal according to the phase difference between the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal and the amplitude difference between the first feeder line, the second feeder line, the third feeder line, and the fourth feeder line, so that when the first radio frequency signal is transmitted to the first path of radiating antenna through the first feeder line, the second radio frequency signal is transmitted to the second path of radiating antenna through the second feeder line, the third radio frequency signal is transmitted to the third path of radiating antenna through the third feeder line, and the fourth radio frequency signal is transmitted to the fourth path of radiating antenna through the fourth feeder line, the phases and amplitudes of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are the same.
The four radiation antennas are connected with the radio frequency power equalizer through the four feeder lines respectively, so that transmission paths of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal, and the balance and accuracy of signal transmission are guaranteed.
Furthermore, the symmetrical four-path broadband antenna module is a symmetrical four-path broadband microstrip array antenna module.
And the backward radiation is reduced, and the coverage of four paths of radiation signals is ensured to be balanced and consistent.
A mimo power equalization method using the 4T4R symmetric antenna system includes the following steps:
s1, the symmetrical four-path transmission and power equalization module generates a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and same in phase and sends the signals to the symmetrical four-path broadband antenna module;
s2, the symmetric four-path broadband antenna module receives the first radio frequency signal and transmits a first radiation signal through the first radiation antenna, receives the second radio frequency signal and transmits a second radiation signal through the second radiation antenna, receives the third radio frequency signal and transmits a third radiation signal through the third radiation antenna, and receives the fourth radio frequency signal and transmits a fourth radiation signal through the fourth radiation antenna.
The method receives four paths of radio frequency signals which are processed and sent by a plurality of power balancing modules through a symmetrical four-path broadband microstrip array antenna, have the same amplitude and frequency and have the phase difference of 0 degree, and then sends radiation signals, so that four paths of radiation signals with the same amplitude and phase and the same coverage range are formed in space, and the mobile terminal can receive the four paths of radiation signals with the same amplitude and frequency and the same phase when moving in a signal coverage range, and has a good receiving effect.
Further, step S1 includes the following steps:
s11, the 4T4R small base station generates a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are of equal amplitude and equal frequency, and sends the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the power balancing module;
s12, the power balancing module performs power distribution on the received first, second, third and fourth radio frequency signals to make the phase difference between the first, second, third and fourth radio frequency signals be 0 degrees, and simultaneously sends the first radio frequency signal to the first path of radiating antenna, the second radio frequency signal to the second path of radiating antenna, the third radio frequency signal to the third path of radiating antenna, and the fourth radio frequency signal to the fourth path of radiating antenna.
The power equalization module is used for carrying out phase processing on the radio frequency signals, so that the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal in frequency, equal in amplitude and same in phase, and four paths of radio frequency signals with consistent amplitude and phase and consistent in coverage range are formed in space.
Further, step S12 includes the steps of:
s121, adjusting the power and the phase of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal according to the phase difference of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal and the amplitude difference of the first feeder line, the second feeder line, the third feeder line and the fourth feeder line, so that when the first radio frequency signal is transmitted to the first path of radiating antenna through the first feeder line, the second radio frequency signal is transmitted to the second path of radiating antenna through the second feeder line, the third radio frequency signal is transmitted to the third path of radiating antenna through the third feeder line, and the fourth radio frequency signal is transmitted to the fourth path of radiating antenna through the fourth feeder line, the phase and the amplitude of the first radio frequency signal, the phase and the amplitude of the second radio frequency signal, the phase and the amplitude of the third radio frequency signal are the same;
and S122, sending the first radio frequency signal to the first path of radiating antenna through the first feeder line, sending the second radio frequency signal to the second path of radiating antenna through the second feeder line, sending the third radio frequency signal to the third path of radiating antenna through the third feeder line, and sending the fourth radio frequency signal to the fourth path of radiating antenna through the fourth feeder line.
The four radiation antennas are connected with the radio frequency power equalizer through the four feeder lines respectively, so that transmission paths of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal, and the balance and accuracy of signal transmission are guaranteed.
The working principle of the 5G signal coverage of the invention is as follows: an outdoor 5G macro base station sends signals to an indoor 4T4R small base station through a cable, the 4T4R small base station transmits radio frequency signals to a radio frequency power equalizer through four radio frequency transmission lines, the radio frequency power equalizer is connected with four symmetrical radiation antennas, the radio frequency power equalizer equalizes and distributes the power of the radio frequency signals through an internal coupling circuit, certain power (preset value) is distributed to the four radiation antennas according to certain proportion, the radio frequency power equalizer is also connected with a next radio frequency power equalizer through other four radio frequency transmission lines, the radio frequency power equalizer and the four radiation antennas of each group form a node, signal coverage of the whole indoor floor is realized through the series connection of a plurality of nodes, the lengths of the radio frequency transmission lines connecting two adjacent radio frequency power equalizers are equal, and eight radio frequency transmission lines connected with two ends of the same radio frequency power equalizer need to ensure high symmetry, and a plurality of radiation antennas connected with each radio frequency power equalizer need to ensure high symmetry, so that radio frequency signals can keep phase consistency all the time. The power distributed to each path of radiating antenna in each node is kept consistent, so that the power proportion distributed to the corresponding radiating antenna by the radio frequency power equalizer on different nodes is different, and the loss of a radio frequency signal during transmission of the radio frequency transmission line is known because the length of the radio frequency transmission line is preset, so that the power proportion distributed to the radiating antenna in each node by the radio frequency power equalizer in each node is as follows: the allocated power/(power transmitted from the previous node — power loss) of the predetermined radiation antenna.
The invention has the beneficial effects that:
1. the four paths of radio frequency signals which are processed and sent by the power equalization modules through the symmetrical four paths of broadband microstrip array antennas, have the same amplitude and the same frequency and have the phase difference of 0 degree, and then the radiation signals are sent, so that four paths of radiation signals which have the same amplitude and the same phase and have the same coverage range are formed in space, and the mobile terminal can receive the four paths of radiation signals which have the same amplitude and the same phase and can move in a signal coverage range, so that the receiving effect is good, the gain range of the 4T4R small base station four paths of radiation signals in an indoor space is consistent, and the good indoor coverage effect is realized;
2. the four radiation antennas are respectively connected with the radio frequency power equalizer through four feeders, so that the transmission paths of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal, and the balance and the accuracy of signal transmission are ensured;
3. the four-path signal transmission can be realized by only adopting one symmetrical four-path broadband antenna module, the structure is simple and light, and the indoor arrangement and installation are facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a 4T4R symmetric antenna system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a symmetric four-path transmission and power equalization module in a 4T4R symmetric antenna system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power equalization module in a 4T4R symmetric antenna system according to an embodiment of the present invention;
fig. 4 is a flowchart of a mimo power equalization method using a 4T4R symmetric antenna system according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating operations of four transmission and power equalization modules in a mimo power equalization method using a 4T4R symmetric antenna system according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating operations of a power balancing module in a mimo power balancing method using a 4T4R symmetric antenna system according to an embodiment of the present invention.
Reference numerals: 1. a symmetrical four-path transmission and power balancing module; 2. a symmetrical four-way broadband antenna module; 11. 4T4R small base station; 12. a power balancing module; 121. a radio frequency power equalizer; 122. a first feed line; 123. a second feed line; 124. a third feeder line; 125. a fourth feed line; 21. a first path of radiating antenna; 22. a second path of radiation antenna; 23. a third path of radiating antenna; 24. and a fourth radiation antenna.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, a 4T4R symmetric antenna system includes a symmetric four-way transmission and power equalization module 1 and a symmetric four-way broadband antenna module 2, where the symmetric four-way broadband antenna module 2 includes a first radiation antenna 21, a second radiation antenna 22, a third radiation antenna 23, and a fourth radiation antenna 24 that are the same in size and are parallel to each other in position, the sizes of the first radiation antenna 21, the second radiation antenna 22, the third radiation antenna 23, and the fourth radiation antenna 24 may be specifically set according to frequencies required by MIMO application in an indoor mobile communication system, and the first radiation antenna 21, the second radiation antenna 22, the third radiation antenna 23, and the fourth radiation antenna 24 are respectively connected to the symmetric four-way transmission and power equalization module 1;
the symmetrical four-path transmission and power equalization module 1 is used for generating a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and in phase and sending the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the symmetrical four-path broadband antenna module 2;
the four-path symmetric broadband antenna module 2 is configured to send a first radiation signal to an indoor space after receiving the first radio frequency signal through the first radiation antenna 21, send a second radiation signal to the indoor space after receiving the second radio frequency signal through the second radiation antenna 22, send a third radiation signal to the indoor space after receiving the third radio frequency signal through the third radiation antenna 23, and send a fourth radiation signal to the indoor space after receiving the fourth radio frequency signal through the fourth radiation antenna 24. Because the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal have equal amplitude and equal frequency and the phase difference is 0 degree, and the first path of radiating antenna 21, the second path of radiating antenna 22, the third path of radiating antenna 23 and the fourth path of radiating antenna 24 are in parallel in phase, the electric field vectors of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are in parallel in space and have equal amplitude and equal frequency effects, so that the first radiating signal, the second radiating signal, the third radiating signal and the fourth radiating signal have correlation, because the size and the structural process of the first path of radiating antenna 21, the second path of radiating antenna 22, the third path of radiating antenna 23 and the fourth path of radiating antenna 24 are completely the same and are located on the same symmetrical four-path broadband antenna, the radiation ranges of the first radiating signal, the second radiating signal, the third radiating signal and the fourth radiating signal are consistent in space, in the process that the indoor mobile terminal moves in the signal coverage range, four paths of related radiation signals can be received all the time, a good constant-amplitude and constant-frequency receiving effect can be obtained, and MIMO is applied to the indoor mobile communication system to the maximum extent.
The four symmetric channels of wideband antenna module 2 transmit four channels of rf signals meeting the frequency required by MIMO application according to the specific requirement of the indoor mobile communication system for applying MIMO, where the four channels of rf signals are the first rf signal, the second rf signal, the third rf signal and the fourth rf signal, respectively, where the amplitudes and frequencies of the first rf signal, the second rf signal, the third rf signal and the fourth rf signal are the same, and the phase difference is 0 degree, and the frequencies required by MIMO application are different due to the different specific indoor communication systems, for example, if the frequency required by MIMO application in LTE is 2500-. The system receives four paths of radio frequency signals which are processed and sent by the power equalization modules 12 through the symmetrical four paths of broadband microstrip array antennas, have the same amplitude and the same frequency and have the phase difference of 0 degree, and then sends radiation signals, so that four paths of radiation signals which are consistent in amplitude and phase and consistent in coverage range are formed in space, the mobile terminal can receive the four paths of radiation signals which are consistent in amplitude and the same phase when moving in the signal coverage range, and the receiving effect is good.
In one embodiment, as shown in fig. 2, the symmetric four-way transmission and power equalization module 1 includes a 4T4R small base station 11 and a power equalization module 12, the 4T4R small base station 11 is connected to the power equalization module 12, and the power equalization module 12 is connected to the first radiating antenna 21, the second radiating antenna 22, the third radiating antenna 23 and the fourth radiating antenna 24, respectively;
the 4T4R small cell 11 is configured to generate a first radio frequency signal, a second radio frequency signal, a third radio frequency signal, and a fourth radio frequency signal with equal amplitude and equal frequency, and send the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal to the power balancing module 12; the 4T4R small cell 11 demodulates the received baseband optical signal, so as to generate four paths of radio frequency signals, which are equal-amplitude equal-frequency first radio frequency signal, second radio frequency signal, third radio frequency signal and fourth radio frequency signal, respectively, and then sends the equal-amplitude equal-frequency first radio frequency signal, second radio frequency signal, third radio frequency signal and fourth radio frequency signal to the power equalization module 12.
The power equalization module 12 is configured to perform power distribution and equalization processing on the received first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal, and the received fourth radio frequency signal, so that a phase difference between the first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal, and the received fourth radio frequency signal is 0 degree, send the first radio frequency signal processed by the power equalization module 12 to the first path of radiation antenna 21, send the received second radio frequency signal to the second path of radiation antenna 22, send the received third radio frequency signal to the third path of radiation antenna 23, and send the received fourth radio frequency signal to the fourth path of radiation antenna 24. The power equalization module 12 performs phase processing on the radio frequency signals, so that the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal have equal frequency, equal amplitude and same phase, and four radio frequency signals with consistent amplitude and phase and consistent coverage range are formed in space.
In one embodiment, as shown in fig. 3, the power equalization module 12 includes a radio frequency power equalizer 121, a first feeder 122, a second feeder 123, a third feeder 124, and a fourth feeder 125;
the radio frequency power equalizer 121 is connected to the first radiating antenna 21 through the first feeder 122, connected to the second radiating antenna 22 through the second feeder 123, connected to the third radiating antenna 23 through the third feeder 124, and connected to the fourth radiating antenna 24 through the fourth feeder 125;
the radio frequency power equalizer 121 is configured to transmit the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal, and control the power and the phase of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal according to the phase difference between the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal and the amplitude difference between the first feeder line 122, the second feeder line 123, the third feeder line 124, and the fourth feeder line 125, so that when the first radio frequency signal is transmitted to the first radiating antenna 21 through the first feeder line 122, the second radio frequency signal is transmitted to the second radiating antenna 22 through the second feeder line 123, the third radio frequency signal is transmitted to the third radiating antenna 23 through the third feeder line 124, and the fourth radio frequency signal is transmitted to the fourth radiating antenna 24 through the fourth feeder line 125, the phases and amplitudes of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are the same.
The rf power equalizer 121 sends the first rf signal, the second rf signal, the third rf signal, and the fourth rf signal with equal amplitude and equal frequency and a phase difference of 0 degree to the four symmetric broadband antenna modules 2 through four equal-length feeders, so as to ensure that transmission paths of the first rf signal, the second rf signal, the third rf signal, and the fourth rf signal are equal, and when reaching the four symmetric broadband antenna modules 2, the phase difference of the first rf signal, the second rf signal, the third rf signal, and the fourth rf signal is still 0 degree.
In one embodiment, the symmetric four-way broadband antenna module 2 is a symmetric four-way broadband microstrip array antenna module.
And the backward radiation is reduced, and the consistency of the coverage range of four paths of radiation signals is ensured.
As shown in fig. 4, a mimo power equalization method using the 4T4R symmetric antenna system includes the following steps:
s1, the symmetrical four-path transmission and power equalization module 1 generates a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and same in phase and sends the signals to the symmetrical four-path broadband antenna module 2;
s2, the symmetric four-path broadband antenna module 2 receives the first radio frequency signal and transmits the first radiation signal through the first radiation antenna 21, receives the second radio frequency signal and transmits the second radiation signal through the second radiation antenna 22, receives the third radio frequency signal and transmits the third radiation signal through the third radiation antenna 23, and receives the fourth radio frequency signal and transmits the fourth radiation signal through the fourth radiation antenna 24.
Because the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal have equal amplitude and equal frequency and the phase difference is 0 degree, and the first path of radiating antenna 21, the second path of radiating antenna 22, the third path of radiating antenna 23 and the fourth path of radiating antenna 24 are in phase and parallel, the electric field vectors of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are in parallel with each other in space and have equal amplitude effect, so that the first radiating signal, the second radiating signal, the third radiating signal and the fourth radiating signal have correlation, because the sizes and the structural processes of the first path of radiating antenna 21, the second path of radiating antenna 22, the third path of radiating antenna 23 and the fourth path of radiating antenna 24 are completely the same and are positioned on the same symmetrical four-path broadband antenna, the radiation ranges of the first radiating signal, the second radiating antenna, the third radiating signal and the fourth radiating signal are consistent in space, in the process that the indoor mobile terminal moves in the signal coverage range, four paths of related radiation signals can be received all the time, a good constant-amplitude receiving effect can be obtained, and MIMO is applied to the indoor mobile communication system to the maximum extent.
The four symmetric channels of wideband antenna module 2 transmit four channels of rf signals meeting the frequency required by MIMO application according to the specific requirement of the indoor mobile communication system for applying MIMO, where the four channels of rf signals are the first rf signal, the second rf signal, the third rf signal and the fourth rf signal, respectively, where the amplitudes and frequencies of the first rf signal, the second rf signal, the third rf signal and the fourth rf signal are the same, and the phase difference is 0 degree, and the frequencies required by MIMO application are different due to the different specific indoor communication systems, for example, if the frequency required by MIMO application in LTE is 2500-. The method receives four paths of radio frequency signals which are processed and sent by the power equalization modules 12 through the symmetrical four paths of broadband microstrip array antennas, have the same amplitude and the same frequency and have the phase difference of 0 degree, and then sends the radiation signals, so that four paths of radiation signals which have the same amplitude and phase and the same coverage range are formed in space, and the mobile terminal can receive the four paths of radiation signals which have the same amplitude and the same phase and have good receiving effect when moving in a signal coverage range.
In one embodiment, as shown in fig. 5, the symmetric four-way transmission and power equalization module 1 includes a 4T4R small base station 11 and a power equalization module 12, and step S1 includes the following steps:
s11, and the 4T4R small cell 11 generates a first radio frequency signal, a second radio frequency signal, a third radio frequency signal, and a fourth radio frequency signal of equal amplitude and equal frequency, and sends the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal to the power equalization module 12; the 4T4R small cell 11 demodulates the received baseband optical signal, so as to generate four paths of radio frequency signals, which are equal-amplitude equal-frequency first radio frequency signal, second radio frequency signal, third radio frequency signal and fourth radio frequency signal, respectively, and then sends the equal-amplitude equal-frequency first radio frequency signal, second radio frequency signal, third radio frequency signal and fourth radio frequency signal to the power equalization module 12.
S12, the power equalizing module 12 performs power distribution on the received first radio frequency signal, second radio frequency signal, third radio frequency signal, and fourth radio frequency signal, so that the phase difference between the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal is 0 degree, and sends the first radio frequency signal to the first radiation antenna 21, the second radio frequency signal to the second radiation antenna 22, the third radio frequency signal to the third radiation antenna 23, and the fourth radio frequency signal to the fourth radiation antenna 24.
The power equalization module 12 performs phase processing on the radio frequency signals, so that the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal have equal frequency, equal amplitude and same phase, four radio frequency signals with consistent amplitude and phase and consistent coverage range are formed in space, and the mobile terminal can receive four paths of radiation signals with equal amplitude and equal phase when moving in a signal coverage range, thereby having good receiving effect. .
In one embodiment, as shown in fig. 6, the power equalization module 12 includes a radio frequency power equalizer 121, a first feeder 122, a second feeder 123, a third feeder 124, and a fourth feeder 125;
the radio frequency power equalizer 121 is connected to the first radiating antenna 21 through the first feeder 122, connected to the second radiating antenna 22 through the second feeder 123, connected to the third radiating antenna 23 through the third feeder 124, and connected to the fourth radiating antenna 24 through the fourth feeder 125;
s121, adjusting the power and the phase of the first, second, third and fourth radio frequency signals according to the phase difference of the first, second, third and fourth radio frequency signals and the amplitude difference of the first, second, third and fourth feeding lines 122, 123, 124 and 125, so that when the first radio frequency signal is transmitted to the first radiating antenna 21 through the first feeder 122, the second radio frequency signal is transmitted to the second radiating antenna 22 through the second feeder 123, the third radio frequency signal is transmitted to the third radiating antenna 23 through the third feeder 124, and the fourth radio frequency signal is transmitted to the fourth radiating antenna 24 through the fourth feeder 125, the phases and amplitudes of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are the same.
S122, sending the first radio frequency signal to the first radiating antenna 21 through the first feeder 122, sending the second radio frequency signal to the second radiating antenna 22 through the second feeder 123, sending the third radio frequency signal to the third radiating antenna 23 through the third feeder 124, and sending the fourth radio frequency signal to the fourth radiating antenna 24 through the fourth feeder 125.
The processing manner of the radio frequency power equalizer 121 on the radio frequency signal power may be implemented in various manners, including various hardware circuit allocation and power processing, and the processing manner of the radio frequency power equalizer 121 on the power may be implemented in manners of physical allocation and signal coupling, which are not described herein again.
Since the frequencies of the first, second, third and fourth rf signals are the same, the wavelengths and propagation periods of the first, second, third and fourth rf signals are the same, and since the first rf signal is transmitted through the first feeder 122, the second rf signal is transmitted through the second feeder 123, the third rf signal is transmitted through the third feeder 124, and the fourth rf signal is transmitted through the fourth feeder 125, the length of the first feeder 122 is the transmission path of the first rf signal, the length of the second feeder 123 is the transmission path of the second rf signal, the length of the third feeder 124 is the transmission path of the third rf signal, and the length of the fourth feeder 125 is the transmission path of the fourth rf signal. The rf power equalizer 121, according to the obtained same phase of the first, second, third and fourth rf signals and the symmetric consistency of the lengths of the first, second, third and fourth feeders 122, 123, 124 and 125, maintains the same frequency and the same phase of the first, second, third and fourth rf signals, so as to control the transmission power of the first, second, third and fourth rf signals, so that the first rf signal is transmitted to the first path of radiating antenna 21 through the first feeder 122; the second radio frequency signal is transmitted to the second radiation antenna 22 through the second feeder line 123; when the third rf signal is transmitted to the third radiating antenna 23 through the third feeder 124 and the fourth rf signal is transmitted to the fourth radiating antenna 24 through the fourth feeder 125, the phases and amplitudes of the first, second, third and fourth rf signals are the same.
The four radiation antennas are respectively connected with the radio frequency power equalizer through four feeders, so that the transmission paths of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are equal, and the balance and the accuracy of signal transmission are ensured;
the above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. A4T 4R symmetric antenna system is characterized by comprising a symmetric four-path transmission and power balancing module and a symmetric four-path broadband antenna module, wherein the symmetric four-path broadband antenna module comprises a first path of radiating antenna, a second path of radiating antenna, a third path of radiating antenna and a fourth path of radiating antenna which have the same size and are mutually parallel in position, and the first path of radiating antenna, the second path of radiating antenna, the third path of radiating antenna and the fourth path of radiating antenna are respectively connected with the symmetric four-path transmission and power balancing module; wherein:
the symmetrical four-path transmission and power equalization module is used for transmitting and equalizing a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and same in phase and sending the signals to the symmetrical four-path broadband antenna module;
the symmetrical four-path transmission and power balancing module comprises a 4T4R small base station and a power balancing module, wherein the 4T4R small base station is connected with the power balancing module, and the power balancing module is respectively connected with the first path of radiation antenna, the second path of radiation antenna, the third path of radiation antenna and the fourth path of radiation antenna;
the 4T4R small base station is configured to generate a first radio frequency signal, a second radio frequency signal, a third radio frequency signal, and a fourth radio frequency signal with equal amplitude and equal frequency, and send the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal to the power balancing module;
the power balancing module is configured to perform power distribution and balancing processing on the received first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal, and the received fourth radio frequency signal, so that a phase difference between the first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal, and the received fourth radio frequency signal is 0 degree, send the first radio frequency signal to the first path of radiation antenna, send the second radio frequency signal to the second path of radiation antenna, send the third radio frequency signal to the third path of radiation antenna, and send the fourth radio frequency signal to the fourth path of radiation antenna;
and the symmetrical four-path broadband antenna module is used for receiving the first radio-frequency signal and sending a first radiation signal through the first path of radiation antenna, receiving the second radio-frequency signal and sending a second radiation signal through the second path of radiation antenna, receiving the third radio-frequency signal and sending a third radiation signal through the third path of radiation antenna, and receiving the fourth radio-frequency signal and sending a fourth radiation signal through the fourth path of radiation antenna.
2. The 4T4R symmetric antenna system according to claim 1, wherein the power equalizing module includes a radio frequency power equalizer, a first feed line, a second feed line, a third feed line, and a fourth feed line;
the radio frequency power equalizer is connected with the first path of radiating antenna through the first feeder line, connected with the second path of radiating antenna through the second feeder line, connected with the third path of radiating antenna through the third feeder line, and connected with the fourth path of radiating antenna through the fourth feeder line;
a radio frequency power equalizer, configured to transmit the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal, and adjust the power and the phase of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal according to the phase difference between the first radio frequency signal, the second radio frequency signal, the third radio frequency signal, and the fourth radio frequency signal and the amplitude difference between the first feeder, the second feeder, the third feeder, and the fourth feeder, so that when the first radio frequency signal is transmitted to the first path of radiating antenna through the first feeder, the second radio frequency signal is transmitted to the second path of radiating antenna through the second feeder, the third radio frequency signal is transmitted to the third path of radiating antenna through the third feeder, and the fourth radio frequency signal is transmitted to the fourth path of radiating antenna through the fourth feeder, the phases and amplitudes of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are the same;
the first feeder line is used for receiving the first radio frequency signal and sending the first radio frequency signal to the first path of radiation antenna; the second feeder line is used for receiving a second radio frequency signal and sending the second radio frequency signal to the second path of radiation antenna; the third feeder line is used for receiving the third radio frequency signal and sending the third radio frequency signal to the third path of radiation antenna; and the fourth feeder line is used for receiving the fourth radio frequency signal and sending the fourth radio frequency signal to the fourth path of radiation antenna.
3. The 4T4R symmetric antenna system according to claim 1 or 2, wherein the symmetric four-way broadband antenna module is a symmetric four-way broadband microstrip array antenna module.
4. A mimo power equalization method using the 4T4R symmetric antenna system of claim 1, comprising the steps of:
s1, the symmetrical four-path transmission and power equalization module transmits and equalizes a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are equal in amplitude, equal in frequency and same in phase and sends the signals to the symmetrical four-path broadband antenna module;
s2, the symmetric four-path broadband antenna module receives the first radio frequency signal and transmits a first radiation signal through the first radiation antenna, receives the second radio frequency signal and transmits a second radiation signal through the second radiation antenna, receives the third radio frequency signal and transmits a third radiation signal through the third radiation antenna, and receives the fourth radio frequency signal and transmits a fourth radiation signal through the fourth radiation antenna.
5. The mimo power equalizing method of claim 4, wherein the step S1 comprises the steps of:
s11, the 4T4R small base station generates a first radio frequency signal, a second radio frequency signal, a third radio frequency signal and a fourth radio frequency signal which are of equal amplitude and equal frequency, and sends the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal to the power balancing module;
s12, the power balancing module performs power distribution and balancing processing on the received first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal and the received fourth radio frequency signal, so that the phase difference between the first radio frequency signal, the received second radio frequency signal, the received third radio frequency signal and the received fourth radio frequency signal is 0 degree, the first radio frequency signal is sent to the first path of radiating antenna, the second radio frequency signal is sent to the second path of radiating antenna, the third radio frequency signal is sent to the third path of radiating antenna, and the fourth radio frequency signal is sent to the fourth path of radiating antenna.
6. The mimo power equalizing method of claim 5, wherein step S12 comprises the steps of:
s121, controlling the power and the phase of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal according to the phase difference of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal and the amplitude difference of the first feeder line, the second feeder line, the third feeder line and the fourth feeder line, when the first radio frequency signal is transmitted to the first path of radiating antenna through the first feeder, the second radio frequency signal is transmitted to the second path of radiating antenna through the second feeder, the third radio frequency signal is transmitted to the third path of radiating antenna through the third feeder, and the fourth radio frequency signal is transmitted to the fourth path of radiating antenna through the fourth feeder, the phases and amplitudes of the first radio frequency signal, the second radio frequency signal, the third radio frequency signal and the fourth radio frequency signal are the same;
and S122, sending the first radio frequency signal to the first path of radiating antenna through the first feeder line, sending the second radio frequency signal to the second path of radiating antenna through the second feeder line, sending the third radio frequency signal to the third path of radiating antenna through the third feeder line, and sending the fourth radio frequency signal to the fourth path of radiating antenna through the fourth feeder line.
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| CN111585048A (en) * | 2020-05-14 | 2020-08-25 | 成都喜马拉雅电通网络有限公司 | 8T8R symmetrical antenna system and multi-input multi-output power balancing method |
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