CN110797654A - High-isolation antenna between same frequency bands and micro base station - Google Patents

High-isolation antenna between same frequency bands and micro base station Download PDF

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Publication number
CN110797654A
CN110797654A CN201911218264.3A CN201911218264A CN110797654A CN 110797654 A CN110797654 A CN 110797654A CN 201911218264 A CN201911218264 A CN 201911218264A CN 110797654 A CN110797654 A CN 110797654A
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antenna
radiators
coupling
coupler
same
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王扬
张凯
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Huizhou Speed Wireless Technology Co Ltd
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Huizhou Speed Wireless Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems
    • 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
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/065—Patch antenna array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The application provides a high isolation antenna and little basic station between same frequency band, the antenna includes: antenna ground, radiator, feed circuit and coupling circuit. The plurality of radiating bodies are distributed on the antenna floor in multiple rows, and the plurality of radiating bodies in each row are connected with the same feed circuit so as to receive and transmit the same-frequency electromagnetic signals. Each feed circuit is provided with a main feed port. The coupling circuit is arranged between the total feed ports corresponding to the two adjacent columns of radiators to couple port signals at the corresponding total feed ports, and generates an adjusting coupling signal with the same amplitude and opposite phase with the spatial coupling signal at the corresponding total feed port of the adjacent columns of radiators to offset the spatial coupling signal. The antenna provided by the application not only can effectively reduce the spatial coupling degree between the micro base station antennas and improve the isolation degree between the same frequency bands of the antenna by adding the directional coupling circuit at the main feed port, but also does not increase extra design difficulty and layout space.

Description

High-isolation antenna between same frequency bands and micro base station
Technical Field
The application relates to the technical field of antennas, in particular to a high-isolation antenna and a micro base station between same frequency bands.
Background
The micro base station is network operation equipment, can be matched with a macro base station to complete network coverage, improves the system capacity of an operator communication network, and meets the access requirements of terminals. The micro base station can further improve the coverage area of the network, and directly provides network access for the terminal in the environment with more buildings such as cities, so that the signal quality of the micro base station directly influences the network access quality of the terminal.
The micro base station generally comprises a rear end transmission circuit and a front end antenna, and in practical application, the front end antenna is fed by the rear end transmission circuit so as to receive and transmit electromagnetic signals. For micro base station antennas arranged in more than one row, the isolation between antenna strips can reflect the mutual coupling degree between antennas in different rows and the purity of received signals. In general, for two rows of same-frequency antennas, the inter-band isolation of the antennas meets the use requirement, which causes great difficulty, and if the inter-band isolation of the antennas is poor, crosstalk between different signals is caused, which causes a high error rate of the micro base station, and affects the communication quality.
In order to improve the isolation between the antenna strips, the distance between the two antenna columns can be increased so as to reduce the space coupling effect between the two antenna columns. For example, the column pitch is set to 0.8 λ, where λ is the wavelength of the transmission signal. However, the micro base station has a small volume, so that the available space of the front-end antenna is smaller, and the array pitch is difficult to reach 0.8 lambda, so that the inter-band isolation of two rows of same-frequency antennas is difficult to meet the requirement.
A metal isolating strip can be added between two adjacent columns of antennas, or as disclosed in application No. 201811031141.4, a super-surface of the metal isolating strip is added above the antennas, so that electromagnetic signals of the two columns of antennas are isolated by the metal isolating strip, and the generation of spatial coupling effect is reduced. However, in the micro base station, the space is extremely limited, and when the array pitch is small, it is difficult to effectively improve the inter-band isolation by loading the metal isolation strips between the arrays. For the method of loading the super-surface of the metal isolation strip above the antenna, the height of the metal isolation strip from the floor is required to reach at least 1/4 λ, which is also difficult to satisfy in the micro base station antenna. Therefore, in general, the inter-band isolation of the micro base station antenna cannot be improved in the above manner, so that the inter-band isolation of the micro base station antenna is relatively poor.
Disclosure of Invention
The application provides a high-isolation antenna and a micro base station between same frequency bands, and aims to solve the problem that the isolation between the bands of the traditional micro base station antenna is poor.
On one hand, the application provides a high-isolation antenna between same frequency bands, which comprises an antenna floor, and a plurality of radiators and feed circuits which are arranged on the antenna floor; the plurality of radiating bodies are distributed in multiple rows, and the plurality of radiating bodies in each row are connected with the same feed circuit so as to receive and transmit the same-frequency electromagnetic signals; the feed circuit is provided with a main feed port and also comprises a coupling circuit;
the coupling circuit is arranged between the total feed ports corresponding to the radiators in two adjacent columns to couple port signals at the total feed ports corresponding to the radiators in one column, and generates an adjusting coupling signal with the same amplitude and the opposite phase as the spatial coupling signal at the total feed ports corresponding to the radiators in the adjacent columns to offset the spatial coupling signal.
Optionally, the coupling circuit includes a coupler and a coaxial line;
one end of the coupler is arranged at the position of a total feed port corresponding to a row of radiators, and the other end of the coupler is connected with the total feed port corresponding to the adjacent row of radiators through the coaxial line;
the length of the coaxial line is such that the phase of the coupling adjustment signal is 180 degrees different from the phase of the spatial coupling signal, so as to cancel the spatial coupling signal by adjusting the coupling signal.
Optionally, the coupling circuit further includes an absorption resistor; the coupler is an interdigital coupler or a coupled line coupler; the coupler comprises a coupling port and an isolation port; the isolation port of the coupler is grounded through the absorption resistor; and the coupling port of the coupler is connected with the coaxial line.
Optionally, the resistance value of the absorption resistor is equal to the resistance value of the coaxial line.
Optionally, the couplers are disposed at two ends of the coaxial line, and the same couplers at two ends of the coaxial line are disposed at two adjacent columns of the total feed ports corresponding to the radiators respectively.
Optionally, the radiator is a radiator based on a single-polarized antenna, a microstrip antenna, a dipole, or a helical antenna.
Optionally, the radiator is a radiator based on a dual-polarized antenna, and each row of radiators is correspondingly connected with two feed circuits; and two coupling circuits are arranged between the four total feed ports corresponding to the radiators in two adjacent columns.
Optionally, the radiator includes two oscillator units arranged in a cross manner; in each row of the radiators, a plurality of the oscillator units with the same deflection direction are connected with the same feed circuit; and in two adjacent columns of radiators, a coupling circuit is arranged between the total feed ports corresponding to the plurality of oscillator units with the same deflection direction.
Optionally, the antenna further includes a dielectric plate; the dielectric plate is arranged on the antenna floor; the radiators in the same column are arranged on the same dielectric slab.
On the other hand, the application also provides a micro base station, and the micro base station comprises the high-isolation antenna between the same frequency bands.
According to the above technical solution, the present application provides a high isolation antenna and a micro base station between same frequency bands, where the antenna includes: antenna ground, radiator, feed circuit and coupling circuit. The plurality of radiating bodies are distributed on the antenna floor in multiple rows, and the plurality of radiating bodies in each row are connected with the same feed circuit so as to receive and transmit the same-frequency electromagnetic signals. The feed circuit is provided with a main feed port. The coupling circuit is arranged between the total feed ports corresponding to the two adjacent columns of radiators to couple port signals at the corresponding total feed ports, and generates an adjusting coupling signal with the same amplitude and opposite phase with the spatial coupling signal at the corresponding total feed port of the adjacent columns of radiators to offset the spatial coupling signal. The antenna provided by the application not only can effectively reduce the spatial coupling degree among the micro base station antennas and improve the isolation degree among the same frequency bands among the antennas, but also does not increase extra design difficulty and layout space by adding the directional coupling circuit at the main feed port.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an inter-band high isolation antenna according to the present application;
fig. 2 is a schematic top view of a high isolation antenna between the same frequency bands according to the present application;
FIG. 3 is a schematic diagram of a coupling circuit structure of an inter-band high isolation antenna according to the present application;
FIG. 4 is an isolation contrast diagram for an inter-band high isolation antenna of the present application;
fig. 5 is a schematic diagram of an antenna structure of a single-polarization dual coupler according to the present application;
FIG. 6 is a schematic diagram of a top view of a single polarization dual coupler antenna of the present application;
fig. 7 is a schematic structural diagram of a dual-polarized single coupler antenna according to the present application;
fig. 8 is a schematic structural diagram of a dual-polarized dual-coupler antenna according to the present application.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The inter-band isolation refers to the ability of two rows of antennas (radiating elements) to transmit and receive electromagnetic signals independently from each other. Because the electromagnetic signals emitted by two columns of antennas close to each other can generate spatial coupling, namely the electromagnetic signals emitted by one column of antennas can be transmitted to the area where the other column of antennas is located from the space above or on the side of the antennas to form a coupling effect, a spatial coupling signal is generated in the other column, and the spatial coupling signal can influence the transmission quality of the original electromagnetic signals. Therefore, the high-isolation antenna between the same frequency bands can reduce the space coupling effect, so that the electromagnetic signals emitted by the two rows of antennas are relatively independent. Typically, the inter-band isolation of the micro base station antenna should be at least-23 dB.
In order to improve the isolation of the micro base station antenna, the application provides a high-isolation antenna between the same frequency bands. Fig. 1 is a schematic structural diagram of an inter-band high-isolation antenna according to the present application. As can be seen from fig. 1, the antenna with high isolation between the same frequency bands provided in the present application includes: antenna ground plane 1, radiator 3, feed circuit 4 and coupling circuit 5. Wherein the antenna floor 1 is provided at the lowermost layer for supporting other components. The antenna floor 1 is a metal plate subjected to grounding treatment. In practical applications, the radiators 3 may have different sizes and shapes according to the number and the intervals of the radiators.
The radiator 3 is an antenna element unit for receiving and transmitting electromagnetic signals, and may be a radiator based on a single-polarized antenna, a dual-polarized antenna, a microstrip antenna, a dipole, or a helical antenna. In practical application, the structure of the radiator 3 can be adaptively selected according to different operating environments of the micro base station. Obviously, for the same micro base station, the plurality of radiators 3 need to have the same structure in order to ensure the antenna radiation quality. For example, fig. 1 shows a patch form in which each of the plurality of radiators 3 is a radiator based on a single polarized antenna; for another example, fig. 3 shows a cross element form, and each of the plurality of radiators 3 is a radiator based on a dual-polarized antenna.
The radiators 3 are distributed on the antenna floor 1 in multiple rows, each row includes the radiators 3, and the radiators 3 in each row are connected to the same feed circuit 4 to receive and transmit the same-frequency electromagnetic signals. For example, as shown in fig. 1, one antenna includes two left and right columns, each of which includes two radiators 3. The two radiators 3 in the left column are connected with a left feed circuit 4 together; the two radiators 3 in the right column are connected together to a right feed circuit 4. It can be seen that the antenna shown in fig. 1 comprises a total of four radiators 3, two feed circuits 4.
In practical applications, the feeding circuit 4 is provided with electronic devices related to antenna transmission and reception signals to generate electromagnetic signals with specific frequencies and wavelengths, and the electromagnetic signals are emitted through the radiators 3, and since the radiators 3 in the same row are connected to the same feeding circuit 4 in the present application, the electromagnetic signals emitted from the radiators 3 in the same row are also the same. In addition, since the application of MIMO (multiple-in multiple-out) technology in a 5G commercial network requires that the radiators 3 coexist in multiple rows and columns at the same frequency in the same antenna, in the present application, the electromagnetic wave signals corresponding to the radiators 3 in multiple rows also keep the same frequency. And a main feed port is arranged on the feed circuit 4. As shown in fig. 1, the total feeding ports (a, b) may be branch interface structures disposed on the feeding circuit 4 of each column of the radiator 3, and the total feeding ports may be disposed in areas close to each other between two adjacent columns, respectively, in order to facilitate the routing of the coupling circuit 5.
In practical applications, the above structure may feed power to each row of radiators 3 through the feeding circuit 4, so that the radiators 3 can transmit and receive electromagnetic signals. When two adjacent columns of radiators 3 emit electromagnetic signals, because the distance is short, the emitted signals are spatially coupled with one another, for example, the radiators 3 in the two columns emit 1710-1880MHz electromagnetic signals, and the signals generate spatially coupled signals in the process of propagating from the left column to the right column, thereby affecting the emission of electromagnetic signals by the radiators 3 in the right column. Similarly, the electromagnetic signals emitted by the radiators 3 on the right columns on the two sides can also influence the emission of the electromagnetic signals on the left column through the space coupling effect.
Further, the antenna also comprises a dielectric plate 2; the dielectric plate 2 is arranged on the antenna floor 1; the radiators 3 in the same row are arranged on the same dielectric plate 2. The dielectric plate 2 may be a plate-like structure made of a dielectric material, such as a PCB board or the like, so as to arrange the feeding circuit 4 and other electric components.
In order to reduce the influence of the spatial coupling effect on the original signal, the antenna with high isolation between the same frequency bands further comprises a coupling circuit 5. The coupling circuit 5 is arranged between the total feed ports corresponding to the two adjacent columns of radiators 3 to couple port signals at the total feed ports corresponding to the radiators 3 in one column, and generates an adjustment coupling signal with the same amplitude and opposite phase as the spatial coupling signal at the total feed ports corresponding to the radiators 3 in the adjacent column to offset the spatial coupling signal.
In practical application, the coupling circuit 5 may couple an adjusted coupling signal with a certain energy from the total feeding port a corresponding to the left column radiator 3, and transmit the adjusted coupling signal to the total feeding port b corresponding to the right column radiator 3, where the energy of the coupled adjusted coupling signal is P1. Similarly, there is spatial mutual coupling between two rows of radiators 3, which results in that the electromagnetic signal of the left row of radiators 3 is spatially coupled to the right row of radiators 3, and then the spatial coupling signal is transmitted to the right row of main feed ports b through the right row of radiators 3 and the corresponding feed circuit 4, where the spatial coupling signal energy is P2, and the magnitude of the spatial coupling energy is equal to the square of the amplitude of the inter-band isolation between two rows of radiators 3, that is:
P2＝|Sba|2；
correspondingly, at the total feeding port b of the right column, two coupling signals of the adjusting coupling signal P1 and the space coupling signal P2 exist. By reasonably controlling the adjustment coupling signal P1, the amplitude of the adjustment coupling signal P1 is equal to that of the spatial coupling signal, and the phases of the adjustment coupling signal P1 and the spatial coupling signal are opposite, so that the two paths of signals can be mutually offset, and the isolation between the two rows of radiators 3 is improved.
The isolation between the left and right radiators 3 is the coupling of the feed signal at the left row of the total feed port a in fig. 2 through the left radiator 3To the right radiator 3, and then to the signal transmission coefficient S at the right row total feed port b through the right radiator 3 and the feed circuit 4ba。
The signal space at the left column of the main feed port a is coupled to the transmission path (denoted as T) of the corresponding space coupling signal at the right column of the main feed port bcouple1): left column feed circuit 4-left column radiator 3 (denoted T)ant1) Left to right spatial distance (denoted T)space) Right column of radiators 3-right column of feed circuits 4 (denoted T)ant2). According to the microwave network theory, the transmission path can be divided into three local networks, and each local network can use a transmission matrix T ═ ABCD]The expression is made, i.e. the three local networks are respectively:
Figure BDA0002300083590000051
Figure BDA0002300083590000052
Figure BDA0002300083590000053
then, by spatial coupling from the left main feed port a to the right main feed port b, the transmission matrix of the whole path can be obtained by the transmission line matrix cascade theorem:
Figure BDA0002300083590000054
meanwhile, the transfer relationship between the transmission coefficient matrix [ S ] and the transmission matrix [ T ] is as follows:
Figure BDA0002300083590000061
from the above equation, the transmission coefficients are as follows:
Figure BDA0002300083590000062
then, the energy of the spatially coupled signal from the left main feeding port a to the right main feeding port b through spatial coupling can be expressed as:
Figure BDA0002300083590000063
in the formula, PaIs the total input energy of the left side total feed port a.
In particular, the coupling circuit 5 comprises a coupler 51 and a coaxial line 52. One end of the coupler 51 is disposed at the position of the total feed port corresponding to one row of radiators 3, and the other end is connected to the total feed port corresponding to the adjacent row of radiators 3 through the coaxial line 52. The length of the coaxial line 52 is such that the phase of the modified coupled signal is 180 ° different from the phase of the spatially coupled signal, so as to cancel the spatially coupled signal by modifying the coupled signal.
As shown in fig. 2 and fig. 3, in the technical solution provided in the present application, a directional coupler 51 is designed at the total feed port a of the left column. The coupler 51 can directly transmit the adjusted coupling energy P1 coupled from the left column main feed port a to the right column main feed port b through the coaxial line 52.
Similarly, the signal transmission path (denoted as T) from the left main feed port a to the right main feed port b through the coupler 51 can be visually analyzed according to the transmission line matrix theorycouple2): directional coupler 51 (denoted T)coupler) Coaxial line 52 (denoted T)coax) The transmission line matrix is:
Tcouple2＝Tcoupler·Tcoax；
since the transmission coefficients of the directional coupler 51 and the coaxial line 52 can be directly expressed, the transmission coefficients can be obtained without being expressed in the form of a matrix T ═ ABCD and then reversely derived.
The directional coupler 51 is a 90 ° directional coupler, and therefore its transmission coefficient can be expressed as:
Figure BDA0002300083590000064
wherein, α1Is the coupling coefficient of the coupler;
and the transmission coefficient of coaxial line 52 is expressed as:
wherein, α2Is the attenuation coefficient of the coaxial cable; dcoaxIs the length of the coaxial cable;
the adjusted coupling signal transmitted from the left main feed port a to the right main feed port b through the directional coupler is:
Figure BDA0002300083590000072
because α2Relatively small, the coupling coefficient α of coupler 511The size of the coupling coefficient (isolation amplitude) is equivalent to that of the space, and the length of the coaxial line 52 at the output end of the coupler 51 is adjusted, so that the formula P1Of (1) and P2Are 180 deg. out of phase. Namely:
Figure BDA0002300083590000073
two-way coupling signal P at right column main feed port b1、P2And the two antenna bands are mutually offset, so that the isolation between the two rows of same-frequency antenna bands is improved.
The above-mentioned improvement method for analyzing the inter-band isolation from the theoretical perspective, however, in the actual engineering, the theoretical calculation is not strictly performed to obtain the length of the coaxial line 52, and in the theoretical calculation, the spatial coupling distance is difficult to obtain an accurate value, so the specific debugging method is as follows: firstly, measuring initial inter-band isolation amplitude | Sba| then designing a directional coupler 51 with a coupling coefficient matched with the directional coupler, and finally actually adjusting the length of the coaxial line 52 to ensure that the inter-band isolation is obviously improved, namely equivalently considering that the amplitudes of the two coupling signals are the same at the position of a right-column general feed port bEqual, 180 out of phase. The method of the directional coupler 51 can obviously improve the isolation between the same frequency bands of the micro base station antenna, does not increase extra design difficulty, and provides reliable guarantee for successfully realizing the high-isolation micro base station antenna.
In practical engineering, as shown in fig. 4, the method is applied to improve the inter-band isolation of the dual-antenna with the same frequency of the micro base station with signal frequency of 1710-.
According to the technical scheme, the antenna with high isolation between the same frequency bands and the micro base station are provided, and the antenna comprises an antenna floor 1, a radiator 3, a feed circuit 4 and a coupling circuit 5. The plurality of radiators 3 are distributed on the antenna floor 1 in multiple rows, and the plurality of radiators 3 in each row are connected with the same feed circuit 4 to receive and transmit the same-frequency electromagnetic signals. The feeder circuit 4 is provided with a total feed port (a, b). The coupling circuit 5 is arranged between the total feed ports (a, b) corresponding to the radiators 4 in two adjacent columns to couple the port signals corresponding to the total feed port a, and generates an adjusting coupling signal with the same amplitude and opposite phase as the spatial coupling signal at the total feed port b corresponding to the radiators in the two adjacent columns to cancel the spatial coupling signal.
According to the antenna provided by the application, the directional coupling circuit 5 is additionally arranged between the main feed ports (a and b), so that the spatial coupling degree between the micro base station antennas can be effectively reduced, the isolation degree between the same frequency bands between the antennas is improved, and the additional design difficulty and layout space are not increased.
In some embodiments of the present application, as shown in fig. 3, the coupling circuit 5 further includes an absorption resistor 53. The absorbing resistor 53 may be selected to have a resistor form according to the overall structure requirement of the antenna, for example, the absorbing resistor 53 may be a patch resistor. The coupler 51 is a coupled line including a coupled port and an isolated port; the isolated port of coupler 51 is grounded through an absorbing resistor 53; the coupling port of the coupler 51 is connected to the coaxial line 52. Further, the resistance value of the absorption resistor 53 is equal to the resistance value of the coaxial line 52.
For example, if the total resistance value of the coaxial line 52 is 50 Ω, the absorption resistor 53 is a patch resistor having a resistance value of 50 Ω. In practical application, a coupler 51 in the form of a coupling line is disposed at the left total feeding port a, the coupling port at the upper end is connected with the coaxial line 52, the isolation port at the lower end is connected with the 50 Ω patch resistor, and the other end of the patch resistor 502 is connected with the ground to absorb the excessive parasitic signal.
It should be noted that, in the technical solution provided in the present application, the resistance value of the absorption resistor 53 is generally equal to the resistance value of the coaxial line 52, but in practical applications, the two may not be equal to each other, as long as the resistance value of the absorption resistor 53 and the resistance value of the coaxial line 52 can maintain the impedance matching characteristic of the whole coupling circuit 5, and obviously, the impedance matching is easier to maintain when the two resistance values are equal to each other.
In some embodiments of the present application, as shown in fig. 5 and 6, the coupler 51 is a coupled line coupler or an interdigital coupler. The couplers 51 are arranged at two ends of the coaxial line 52, and the couplers 51 at two ends of the same coaxial line 52 are respectively arranged at the positions of the total feed ports corresponding to the two adjacent columns of radiators 3.
In the present embodiment, an antenna having a single polarized radiator 3 and a double coupler 51 is provided. That is, the antenna is provided with couplers 51 at the total feeding ports (a, b) of the left and right columns, and the couplers 51 may be coupled line couplers or interdigital couplers. If the initial spatial coupling coefficient (inter-band isolation) is between-25 dB and-30 dB, and the system requires-30 dB to-40 dB inter-band isolation, then the dual-coupled line coupler 51 can be used to increase the inter-band isolation. The two couplers 51 can realize the coupled signal from the left total feeding port a, the amplitude of the coupled signal when coupled to the right total feeding port b is about (-10dB to-20 dB) × 2 (-20dB to-40 dB), and the amplitude can be matched with the initial spatial coupling coefficient, so as to improve the isolation between the two rows of radiators 3.
When the initial isolation is poor (e.g., -15dB or so), if the dual coupler approach is used, the coupler 51 is matched using an interdigital coupler. The interdigital coupler can provide a strong coupling coefficient (greater than-6 dB), and then after the coupled signal enters the double-path coupler, the amplitude (-6dB multiplied by 2 to-12 dB) at the total feed port b of the right column can be matched with the spatial coupling coefficient, and finally the purpose of phase reversal cancellation is achieved.
In some embodiments of the present application, as shown in fig. 7, the radiators 3 are based on a dual-polarized antenna, and each row of radiators 3 is correspondingly connected with two feed circuits 4; two coupling circuits 5 are arranged between four corresponding total feed ports of the radiators 3 in two adjacent columns.
That is, in the present embodiment, a dual polarized single coupler antenna is provided. Specifically, the radiator 3 includes two vibrator elements arranged to cross each other. In each column of radiators 3, a plurality of oscillator units with the same deflection direction are connected with the same feed circuit 4. In two adjacent columns of radiators 3, a coupling circuit 5 is arranged between the total feed ports corresponding to the plurality of oscillator units with the same deflection direction.
Similarly, two couplers 51 may be provided on a coaxial line 52 in the coupling circuit 5 based on the form of the radiator 3 of the dual-polarized antenna, so as to form a dual-polarized dual-coupler antenna, as shown in fig. 8.
The dual-polarized single coupler antenna form and the dual-polarized dual coupler antenna form can improve the isolation of the dual-polarized antenna respectively. That is, in order to improve the inter-band isolation of the two co-polarized signals, two coupler signals need to be added. In practical application, a proper coupler 51 can be designed according to system requirements, and then the length of the coaxial line 52 is adjusted, so that the coupling signals at the total feed ports c and d of the right-row dual-polarized antenna are respectively equal to the spatial coupling coefficients (inter-band isolation) of the corresponding polarizations in amplitude and 180 degrees in phase difference, and finally the inter-band isolation of the whole system is improved.
Based on the high-isolation antenna between the same frequency bands, the application also provides a micro base station to provide mobile network connection for the terminals in the coverage area by matching with the macro base station. The micro base station comprises the high-isolation antenna between the same frequency bands, and can also comprise other modules, such as a core network module, a modulation and demodulation module, a power control module, a power supply module and the like.
The antenna with high isolation between the same frequency bands can improve the isolation of the antenna through the coupling circuit 5, so that the antenna can adapt to narrow space in a micro base station. Therefore, according to the micro base station provided by the application, the space coupling degree between the micro base station antennas can be effectively reduced without a traditional method for improving the isolation degree between the same frequency bands, namely, without enlarging the antenna distance, increasing the isolation strips or using the super surface to carry out physical decoupling, so that the isolation degree between the same frequency bands between the antennas is improved, and additional design difficulty and layout space are not increased.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.

Claims (10)

1. A high-isolation antenna between same frequency bands comprises an antenna floor (1), and a plurality of radiators (3) and feed circuits (4) which are arranged on the antenna floor (1); the plurality of radiating bodies (3) are distributed in multiple rows, and the plurality of radiating bodies (3) in each row are connected with the same feed circuit (4) to receive and transmit common-frequency electromagnetic signals; the feed circuit (4) is provided with a main feed port and is characterized by also comprising a coupling circuit (5);
the coupling circuit (5) is arranged between the total feed ports corresponding to the radiators (3) in two adjacent columns to couple port signals at the total feed ports corresponding to the radiators (3) in one column, and generates adjusting coupling signals with the same amplitude and opposite phases as the spatial coupling signals at the total feed ports corresponding to the radiators (3) in the adjacent columns to offset the spatial coupling signals.
2. The inter-band high isolation antenna according to claim 1, wherein the coupling circuit (5) comprises a coupler (51) and a coaxial line (52);
one end of the coupler (51) is arranged at the position of a total feed port corresponding to one row of radiators (3), and the other end of the coupler is connected with the total feed port corresponding to the adjacent row of radiators (3) through the coaxial line (52);
the coaxial line (52) has a length such that the phase of the modified coupling signal differs from the phase of the spatially coupled signal by 180 DEG, in order to cancel the spatially coupled signal by modifying the coupling signal.
3. The inter-band high isolation antenna according to claim 2, characterized in that the coupling circuit (5) further comprises an absorption resistor (53);
the coupler (51) is an interdigital coupler or a coupled line coupler; the coupler (51) comprises a coupled port and an isolated port; the isolated port of the coupler (51) is grounded through the absorption resistor (53); the coupling port of the coupler (51) is connected with the coaxial line (52).
4. The inter-band high isolation antenna according to claim 3, characterized in that the absorption resistance (53) has a resistance value equal to the resistance value of the coaxial line (52).
5. The inter-band high-isolation antenna according to claim 2, wherein the couplers (51) are disposed at both ends of the coaxial line (52), and the couplers (51) at both ends of the same coaxial line (52) are respectively disposed at the positions of the total feed ports corresponding to the two adjacent columns of radiators (3).
6. The inter-band high isolation antenna according to claim 1, characterized in that the radiator (3) is a radiator based on a single polarized antenna, a microstrip antenna, a dipole or a helical antenna.
7. The inter-band high isolation antenna according to claim 1, wherein the radiators (3) are dual-polarized antenna-based radiators, and each row of radiators (3) is connected to two corresponding feed circuits (4); two coupling circuits (5) are arranged between four total feed ports corresponding to the radiators (3) in two adjacent columns.
8. The inter-band high isolation antenna according to claim 7, wherein the radiator (3) comprises two element units arranged to cross each other;
in each row of the radiators (3), a plurality of oscillator units with the same deflection direction are connected with the same feed circuit (4); and in two adjacent radiating bodies (3), a coupling circuit (5) is arranged between the total feed ports corresponding to the plurality of oscillator units with the same deflection direction.
9. The inter-band high isolation antenna according to claim 1, wherein the antenna further comprises a dielectric plate (2); the dielectric plate (2) is arranged on the antenna floor (1); the radiators (3) in the same column are arranged on the same dielectric plate (2).
10. A micro base station comprising the inter-band high isolation antenna of any one of claims 1-9.
CN201911218264.3A 2019-12-03 2019-12-03 High-isolation antenna between same frequency bands and micro base station Pending CN110797654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911218264.3A CN110797654A (en) 2019-12-03 2019-12-03 High-isolation antenna between same frequency bands and micro base station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911218264.3A CN110797654A (en) 2019-12-03 2019-12-03 High-isolation antenna between same frequency bands and micro base station

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CN110797654A true CN110797654A (en) 2020-02-14

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111509379A (en) * 2020-04-09 2020-08-07 山东华箭科工创新科技有限公司 Double-layer 5G microstrip array antenna
CN112398502A (en) * 2020-11-09 2021-02-23 西北工业大学 Polarization deflection non-sensitive wireless power and information transmission system
CN112886278A (en) * 2020-11-02 2021-06-01 武汉汉烯科技有限公司 MIMO antenna array with high isolation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111509379A (en) * 2020-04-09 2020-08-07 山东华箭科工创新科技有限公司 Double-layer 5G microstrip array antenna
CN112886278A (en) * 2020-11-02 2021-06-01 武汉汉烯科技有限公司 MIMO antenna array with high isolation
CN112398502A (en) * 2020-11-09 2021-02-23 西北工业大学 Polarization deflection non-sensitive wireless power and information transmission system
CN112398502B (en) * 2020-11-09 2022-01-04 西北工业大学 Polarization deflection non-sensitive wireless power and information transmission system

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