CN116315665A - Pi-type decoupling network for MIMO antenna array - Google Patents
Pi-type decoupling network for MIMO antenna array Download PDFInfo
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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
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a pi type decoupling network for a MIMO antenna array, the MIMO antenna has a plurality of antenna units, a plurality of antenna units are respectively connected with a public substrate, the substrate is far away from the antenna unit side and is configured with a feed network matched with the number of the antenna units, pi type decoupling networks are configured between homopolar feed ends of the feed networks of two adjacent antenna units, the pi type decoupling networks are used for improving homopolar isolation between adjacent antenna units, and homopolar isolation between adjacent antennas can be effectively improved through the pi type decoupling networks. Simulation verifies that the pi-type decoupling network does not have great influence on the different polarization isolation of the antenna in the frequency band of 3.4-3.8GHz. The antenna has the advantages of no obvious distortion of the radiation pattern, small size, low profile, high isolation and the like.
Description
Technical Field
The application relates to the field of wireless communication, in particular to a pi-type decoupling network applicable to a MIMO antenna array.
Background
Multiple-input multiple-output (MIMO, multiple input multiple output) is a technique that uses multipath propagation to simultaneously transmit multiple data signals on the same radio frequency channel using multiple transmit and receive antennas at the transmitting and receiving ends, respectively. Due to space constraints, the multiple antennas at the transmitting and receiving ends need to be closely aligned, but the mutual coupling between the antenna elements will also increase, which will lead to deterioration of the gain, reflection coefficient, radiation pattern, etc. of the antennas. How to eliminate the coupling between antennas becomes a problem to be solved.
Various decoupling methods have been proposed by researchers at home and abroad for improving isolation, such as decoupling networks, artificial metamaterials and supersurfaces, and array antenna decoupling surfaces. The decoupling network is a decoupling structure similar to a neutral line, which is connected in parallel with the feed lines of the two antennas. The neutralization line is also connected with two antennas to add an extra signal path to offset unwanted current caused by coupling, so that higher port isolation is realized, but the method of neutralization line lacks a systematic method to determine the insertion position. Electromagnetic band gap, split resonant ring and improved split resonant ring are all common metamaterial types, and serve as sub-wavelength resonators to inhibit propagation of electromagnetic wave and improve isolation of the antenna. The array antenna decoupling surface is a thin surface composed of a plurality of electrically small metal patches, and is generally placed above the array antenna, and unwanted coupling waves in the array are eliminated by controlling diffracted waves of the antenna decoupling surface. In the literature [ Y.Cheng and K.M.Cheng, "A Novel Dual-Band Decoupling and Matching Technique for Asymmetric Antenna Arrays," in IEEE Transactions on Microwave Theory and Techniques, vol.66, no.5, pp.2080-2089,May 2018,doi:10.1109/TMTT.2018.279101 ], two frequency bands are decoupled respectively by using a two-stage decoupling feed network, and the port isolation of the array is improved by more than 20dB at two center frequencies. The method does not involve any double-frequency phase shifter and double-frequency band matching network, so that the simple circuit topology structure enables the design to be more flexible. While isolation is improved, bandwidth is reduced by about 10%. In the literature [ R.Xia, S.Qu, P.Li, Q.Jiang and Z.Nie, "An Efficient Decoupling Feeding Network for Microstrip Antenna Array," in IEEE Antennas and Wireless Propagation Letters, vol.14, pp.871-874,2015, doi:10.1109/LAWP.2014.2380786] a decoupled feed network consisting of two directional couplers and two transmission lines is proposed, whereby by connecting the two couplers, direct coupling caused by spatial and surface waves between amplitude and phase controllable indirect coupling cancellation units is introduced, the mutual coupling of the ports being below-58 dB at the center frequency. Literature [ y. Cheng and k.m. cheng, "Compact Wideband Decoupling and Matching Network Design for Dual-Antenna Array," in IEEE Antennas and Wireless Propagation Letters, vol.19, no.5, pp.791-795,May 2020,doi:10.1109/law.2020.2980293 ] proposes a wideband decoupling technique for MIMO Antenna arrays, in combination with capacitive elements, with port isolation greater than 25dB in the frequency range of 3.3-3.7 GHz. In the documents [ Metasurface Spatial Filtering, in IEEE Transactions on Electromagnetic Compatibility, vol.63, no.1, pp.57-65, feb.2021, doi:10.1109/TEMC.2020.3004189], a modified closed-loop super-surface unit is used to form a partition wall according to a certain regular arrangement to load the partition wall between the MIMO antenna units, so that the space wave coupling between the units can be effectively reduced. A super surface consisting of two cut lines of different lengths is proposed in the literature [ F.Liu, J.Guo, L.Zhao, G.Huang, Y.Li and Y.yin, "Dual-Band Metassurances-Based Decoupling Method for Two Closely Packed Dual-Band Antennas," in IEEE Transactions on Antennas and Propagation, vol.68, no.1, pp.552-557, jan.2020, doi:10.1109/TAP.2019.2940316], which structure is placed over an array to increase the isolation to above 25dB in both the 2.5-2.7GHz and 3.4-3.6GHz bands. The first time an Array antenna decoupling surface was proposed in the literature [ K.Wu, C.Wei, X.Mei and z. Zhang, "Array-Antenna Decoupling Surface," in IEEE Transactions on Antennas and Propagation, vol.65, no.12, pp.6728-6738, dec.2017, doi:10.1109/tap.2017.2712818 ], for reducing mutual coupling between antenna elements in a large-scale Array antenna. There are many decoupling methods for arrays, and besides the decoupling effect, problems of miniaturization, gain, bandwidth, complexity of decoupling structure, applicability and the like of the arrays need to be considered.
Disclosure of Invention
To overcome the above drawbacks, the present application aims to: the application provides a pi-type decoupling network based on a transmission line, which is used for improving homopolar isolation between antennas.
In order to achieve the above purpose, the present application adopts the following technical scheme,
a pi-type decoupling network for a MIMO antenna array, characterized in that,
the MIMO antenna array is provided with a plurality of antenna units, the antenna units are respectively connected with a common substrate,
and a pi-type decoupling network is arranged between homopolar feed ends of the feed networks of two adjacent antenna units, and the pi-type decoupling network is used for improving homopolar isolation between the adjacent antenna units. The decoupling network can effectively improve the homopolar isolation between adjacent antennas, and the heteropolar isolation of the antennas can not be greatly influenced in the 3.4-3.8GHz frequency band. The homopolar feeding terminals are the same-side feeding terminals (e.g., the first feeding terminal 111 and the second feeding terminal 112).
Preferably, the antenna unit comprises a first dielectric plate and a second dielectric plate,
the substrate is provided with a feed network on the side far away from the first dielectric plate, the feed network is connected to the first dielectric plate through a probe, the second dielectric plate is arranged on the side far away from the substrate of the first dielectric plate, and the substrate, the first dielectric plate and the second dielectric plate are arranged at intervals.
Preferably, a first side of the second dielectric plate is opposite to the second dielectric plate, 4Y-shaped probes are configured on the first side, and the feed network is connected to the Y-shaped probes through the probes.
Preferably, the center distance between the adjacent two antenna elements is about 0.48 lambda 0 Wherein lambda is 0 Is a wavelength in free space.
Preferably, the pi-type decoupling network for a MIMO antenna array comprises 2 antenna units, and the feed network comprises: the first power supply end, the second power supply end, the third power supply end and the fourth power supply end, wherein the first power supply end and the second power supply end are polarized together, the third power supply end and the fourth power supply end are polarized together,
the first feeding end and the third feeding end are combined to feed the first antenna unit, the phase difference between the first feeding end and the third feeding end is 180 degrees,
the second feeding end and the fourth feeding end are combined to feed the second antenna unit, the phase difference between the second feeding end and the fourth feeding end is 180 degrees,
a first coupling path is arranged between the first feed end and the second feed end,
a second coupling path is configured between the third feed end and the fourth feed end.
Preferably, the first feeding terminal includes:
a first transmission line, one end of which is provided with a second transmission line and a third transmission line, and the first transmission line is perpendicular to the first coupling path,
the end part of the second transmission line is provided with a first feed end, and the end part of the third transmission line is provided with a second feed end. The electrical length of the first transmission line can be calculated
Obtained.
Preferably, the first transmission line is provided with a first stub, which is parallel or substantially parallel to the first coupling path.
Preferably, the third feeding terminal includes:
a fourth transmission line, one end of which is provided with a fifth transmission line and a sixth transmission line,
the end part of the fifth transmission line is provided with a third feed end, the end part of the sixth transmission line is provided with a fourth feed end, and the fourth transmission line is provided with a second branch.
Preferably, the second stub is parallel or substantially parallel to the second coupling path.
Preferably, the combination of the first power supply end, the second power supply end, the third power supply end and the fourth power supply end is square and is electrically connected to the first dielectric plate through the probes respectively,
the first power supply end and the second power supply end, and the third power supply end and the fourth power supply end are arranged diagonally.
Advantageous effects
Compared with the prior art, the decoupling network of the embodiment of the application realizes high isolation of homopolar ports of adjacent antennas, and the radiation performance of the array is not affected. The decoupling antenna provided by the application has the characteristics of wider impedance bandwidth, low profile, high isolation and the like through simulation verification.
Drawings
Figure 1 is a schematic diagram of a transmission line based pi-type decoupling network for an antenna according to an embodiment of the present application,
figure 1a is a schematic perspective view of an antenna according to an embodiment of the present application,
figure 2 is a schematic illustration of the second dielectric plate of figure 1 with one antenna omitted,
FIG. 3 is a schematic view of FIG. 2 with the first dielectric plate and the second dielectric plate of an antenna omitted and the substrate configured to be transparent,
figure 4 is a schematic view from above at a view angle of figure 1,
figure 5 is a schematic top view of figure 1,
figure 5a is a schematic side view of figure 1 from a perspective,
figure 6 is a schematic diagram of an equivalent circuit of a pi-type decoupling network according to an embodiment of the present application,
figure 6a is a schematic diagram of an equivalent circuit of the decoupling network of figure 6,
figure 7 is an equivalent circuit schematic diagram of a matching network of an antenna according to an embodiment of the present application,
figure 8a is a schematic diagram of a simulation of impedance matching of an antenna according to an embodiment of the present application,
figure 8b is a schematic diagram of a simulation of the isolation of an antenna according to an embodiment of the present application,
fig. 9a/b is a schematic diagram of a simulation of a far field pattern of an antenna according to an embodiment of the present application.
Detailed Description
The above-described aspects are further described below in conjunction with specific embodiments. It should be understood that these examples are illustrative of the present application and are not limiting the scope of the present application. The implementation conditions employed in the examples may be further adjusted as in the case of the specific manufacturer, and the implementation conditions not specified are typically those in routine experiments.
The application provides a MIMO antenna, it has a plurality of antenna units, has pi type decoupling network between two adjacent antenna units, can improve the homopolar isolation between the adjacent antenna effectively through this pi type decoupling network, and verifies through the emulation that this antenna can not produce great influence to the different polarization isolation of antenna at 3.4-3.8GHz frequency channel. The method does not cause obvious distortion of the radiation pattern, and has the advantages of small size, low profile, high isolation and the like. The structure introduces a coupling path between feed networks through loading decoupling networks, and the coupling between the feed networks and the original antennas are mutually offset, so that the high isolation of homopolar ports of adjacent antennas is realized, and the radiation performance of the array is not affected. The decoupling antenna provided by the application has the characteristics of wider impedance bandwidth, low profile, high isolation and the like through simulation verification. Therefore, the pi-type decoupling network provided by the application is used for improving the homopolar isolation between the antenna units, and meanwhile, the antenna units utilize Y-type probes and differential feed to improve the heteropolar isolation, and other decoupling structures are not required to be added between the heteropolar ports. The pi-type decoupling network does not change the radiation performance and bandwidth of the array, and does not increase the size of the array, so that the antenna array still meets the characteristic of low profile.
The pi-type decoupling network of the present application is described next with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a pi-type decoupling network based on a transmission line for an antenna according to an embodiment of the present application, and a perspective schematic diagram of the antenna is shown in fig. 1a, where the antenna includes a square (e.g. rectangular) housing 140.
The antenna 100 is configured to have a 1 x 2 antenna array (antenna unit), the antenna 100 has a rectangular parallelepiped shape,
it comprises the following steps:
a substrate 110, a first dielectric plate 120 and a second dielectric plate 130, which are disposed at intervals,
the side of the substrate 110 remote from the first dielectric plate 120 is provided with a feed network connected to the Y-shaped probes of the first dielectric plate 120 by probes. In the present embodiment, the substrate 110, the first dielectric plate 120, and the second dielectric plate 130 are respectively Rogers 4730G3 substrates having a thickness of 0.508mm, a relative dielectric constant of 2.98, and a loss tangent of 0.0023. The overall size of the antenna array was 60 (W) ×100 (L) ×9.832mm3.
The internal structure of the antenna proposed in the present application is described in detail below with reference to figures 2-5,
one side of the substrate 110 is configured with a feed network comprising:
a first power supply terminal 111, a second power supply terminal 112, a third power supply terminal 113 and a fourth power supply terminal 114,
wherein, the liquid crystal display device comprises a liquid crystal display device,
the first feeding terminal 111 and the third feeding terminal 113 are combined to feed the first antenna unit, the first feeding terminal 111 and the third feeding terminal 113 are 180 deg. out of phase,
the second feeding end 112 and the fourth feeding end 114 are combined to feed the second antenna element, and the second feeding end 112 and the fourth feeding end 114 are 180 ° out of phase.
A first coupling path 116 is arranged between the first feed end 111 and the second feed end 112,
a second coupling path 115 is arranged between the third feeding terminal 113 and the fourth feeding terminal 114,
in the present embodiment, the first power supply terminal 111 and the second power supply terminal 112 are arranged in the same wiring configuration, the third power supply terminal 113 and the fourth power supply terminal 114 are arranged in the same wiring configuration,
only the wiring of the first power feeding terminal 111 and the third power feeding terminal 113 will be described below,
the first power feeding terminal 111 includes:
the first transmission line 111c has one end provided with the second transmission line 111c1 and the third transmission line 111c2, the second transmission line 111c1 has an end provided with the first power feeding portion 111a, the third transmission line 111c2 has an end provided with the second power feeding portion 111b, the first transmission line 111c has a branch 111c3, the branch 111c3 is arranged parallel or substantially parallel to the first coupling path 116, and the branch 111c3 is used for adjusting a matching impedance (also referred to as a matching network) of the first transmission line 111 c. The branch 111c3 is disposed perpendicular to the first transmission line 111 c. The first coupling path 116 is disposed perpendicular to the first transmission line 111 c.
The third feeding terminal 113 includes:
a fifth transmission line 113c1 and a sixth transmission line 113c2 are disposed at one end of the fourth transmission line 113c, a third power feeding portion 113b is disposed at an end of the fifth transmission line 113c1, a fourth power feeding portion 113a is disposed at an end of the sixth transmission line 113c2, and a branch 113c3 (acting as the same as the branch 111c 3) is disposed on the fourth transmission line 113c, and the branch 113c3 is parallel or substantially parallel to the second coupling path 115.
The combination of the first power supply portion 111a, the second power supply portion 111b, the third power supply portion 113b, and the fourth power supply portion 113a is square, and the first power supply portion 111a and the second power supply portion 111b, and the third power supply portion 113b and the fourth power supply portion 113a are diagonally arranged. The first power feeding portion 111a, the second power feeding portion 111b, the third power feeding portion 113b, and the fourth power feeding portion 113a are electrically connected to the first dielectric plate 120 through probes, respectively.
4Y-shaped probes (a first Y-shaped probe 122, a second Y-shaped probe 123, a third Y-shaped probe 124, and a fourth Y-shaped probe 125) are disposed on the first side 121 of the first dielectric plate 120,
the first Y-shaped probe 122 has a connection end 122a for connecting the probes to electrically connect to the feed network, the second Y-shaped probe 123 has a connection end 123a, the third Y-shaped probe 124 has a connection end 124a, and the fourth Y-shaped probe 125 has a connection end 125a for connecting the probes to electrically connect to the feed network, respectively. In this embodiment, the Y-openings of the 4Y-shaped probes are directed inward. The interval between the substrate 110 and the first dielectric plate 120 is h1, and the interval between the first dielectric plate 120 and the second dielectric plate 130 is h2. In a preferred embodiment, the spacing between the substrate 110 and the first dielectric plate 120 is 2.508mm for h1, and the spacing between the first dielectric plate 120 and the second dielectric plate 130 is 5.8mm for h2.
The feed network of the substrate 110 includes two power dividers which are equally divided, and two output ports are 180 ° out of phase (e.g., between the first feed end 111 and the third feed end 113) to implement differential feeding. The output port of the power divider is connected to four Y-shaped probes on the upper layer of the first dielectric plate by probes, and the four Y-shaped probes on the first dielectric plate are then excited by coupling feed to the patches on the second dielectric plate.
The center distance between the two antenna elements 101 and 102 is about 0.48 lambda 0 Wherein lambda is 0 Is a wavelength in free space. There is a strong spatial coupling between two adjacent antennas, and when antenna 101 is excited, the radiated electromagnetic waves generate induced currents on antenna 102, which in turn affect the current distribution over antenna 101,which affects the radiation performance of the antenna element 102. The decoupling network works as follows: a coupling path is introduced between the feed networks of the antennas (a first coupling path 116 is introduced between the first feed end 111 and the second feed end 113112, and a second coupling path 115 is introduced between the third feed end 112113 and the fourth feed end 114) to cancel the original coupling between the two antennas. Two mutually coupled antennas are phase shifted by a transmission line (113 c/111 c) of electrical length theta 1, which is connected to cancel the real part of the mutual admittance of the coupled antennas, and then connected to a decoupling network (DN, decoupling network) for canceling the imaginary part of the mutual admittance. In this embodiment, two antenna units are used. In other embodiments 3 antenna elements or more may be employed (which may be arranged in one or more rows).
And then, through software verification, obtaining a scattering matrix by using HFSS software or a vector network analyzer, and then obtaining the admittance matrix of the coupled antenna through a conversion formula.
As shown in fig. 6, fig. 6a is an equivalent circuit schematic diagram of the decoupling network in fig. 6.
The coupling between Antenna elements 101/102 (i.e. Antenna 1/Antenna 2) is represented by transmission parameters (a, B, C, D).
According to the theory of a microwave network, a transmission matrix after the cascade connection of an antenna and a section of transmission line with characteristic impedance Z0 and electrical length theta 1 can be expressed as:
to eliminate (
According to equation (1), it is possible to obtain:
values of θ1 and Z0 can thus be calculated.
The coupled antenna after phase shifting is connected with a decoupling network, and the admittance matrix is expressed as:
since the imaginary part of the admittance matrix after phase shifting is eliminated by the decoupling network, then
The parameter values of the decoupling network can be calculated from the transmission matrix of the decoupling network and equation (4).
The matching network (matchnetwork) is composed of branch line with characteristic impedance Z0 and electric length phi and open branch node with characteristic impedance ZT, as shown in figure 7, and has simple structure and easy realization.
The optimized circuit parameters of the decoupling network and the matching network are shown in table 1.
Table 1 circuit parameters of decoupling and matching networks
And a coupling path is introduced between feed networks of the coupling antennas through loading decoupling networks, and the coupling between the feed networks and the original antennas is counteracted, so that high isolation between adjacent antenna units and polarized ports is realized. The decoupling method has simple structure and does not affect the radiation performance of the array. The optimized decoupling antenna has the characteristics of wider impedance bandwidth, low profile, high isolation and the like. Since the design of the decoupling network is independent of the antenna type, this decoupling method can also be used in other types of antennas.
The S parameters of the simulated and tested antenna array are shown in fig. 8 b. Impedance matching as shown in fig. 8a, it can be seen from fig. 8a that the-10 dB bandwidth of the decoupling antenna is 600MHz (16.7%), from 3.3GHz to 3.9GHz, covering the study frequency band 3.4-3.8GHz.
It can be seen from fig. 8a that the isolation (S31) of the homopolarized ports between two adjacent antenna elements increases from 15dB to above 35dB at 3.58 open Hz, and the heteropolarized isolation (S21) is above 30dB in the frequency range of 3.4-3.8GHz.
Fig. 9a/9b are far field patterns, fig. 9a is an x-z plane direction simulation, and fig. 9a is a y-z plane direction simulation, it can be seen from fig. 9a/9b that no significant distortion of the pattern is caused after loading the decoupling network. The pi-type decoupling network can be used for reducing the mutual coupling of dual-polarized patch antennas, the homopolar isolation of adjacent antennas is improved by 24dB after the decoupling network is introduced, and the far-field pattern is not changed basically. The mode is easy to optimize, small in size, good in decoupling performance and suitable for other MIMO systems (such as three-antenna units or multiple-antenna units).
The foregoing embodiments are provided to illustrate the technical concept and features of the present application and are intended to enable those skilled in the art to understand the contents of the present application and implement the same according to the contents, and are not intended to limit the scope of the present application. All such equivalent changes and modifications as come within the spirit of the disclosure are desired to be protected.
Claims (10)
1. A pi-type decoupling network for a MIMO antenna array, characterized in that,
the MIMO antenna array is provided with a plurality of antenna units, the antenna units are respectively connected with a common substrate,
and a pi-type decoupling network is arranged between homopolar feed ends of the feed networks of two adjacent antenna units, and the pi-type decoupling network is used for improving homopolar isolation between the adjacent antenna units.
2. A pi decoupling network for a MIMO antenna array as claimed in claim 1,
the antenna unit includes: a first dielectric plate and a second dielectric plate,
the substrate is provided with a feed network on the side far away from the first dielectric plate, the feed network is connected to the first dielectric plate through a probe, the second dielectric plate is arranged on the side far away from the substrate of the first dielectric plate, and the substrate, the first dielectric plate and the second dielectric plate are arranged at intervals.
3. A pi decoupling network for a MIMO antenna array as claimed in claim 2,
the first side of the first dielectric plate faces the second dielectric plate, 4Y-shaped probes are arranged on the first side, the feed network is connected to the Y-shaped probes through the probes, and the Y-shaped probes excite patches on the second dielectric plate through coupling feed.
4. A pi decoupling network for a MIMO antenna array as claimed in claim 2,
the center distance between two adjacent antenna elements is about 0.48 lambda 0 Wherein lambda is 0 Is a wavelength in free space.
5. A pi-type decoupling network for a MIMO antenna array according to claim 2, comprising: the number of the antenna elements is 2,
the feed network comprises: a first power supply end, a second power supply end, a third power supply end and a fourth power supply end, wherein,
the first feeding end and the third feeding end are combined to feed the first antenna unit, the phase difference between the first feeding end and the third feeding end is 180 degrees,
the second feeding end and the fourth feeding end are combined to feed the second antenna unit, the phase difference between the second feeding end and the fourth feeding end is 180 degrees,
a first coupling path is arranged between the first feed end and the second feed end,
a second coupling path is configured between the third feed end and the fourth feed end.
6. A pi decoupling network for a MIMO antenna array as claimed in claim 5,
the first feeding end includes:
a first transmission line, one end of which is provided with a second transmission line and a third transmission line, and the first transmission line is perpendicular to the first coupling path,
the end part of the second transmission line is provided with a first power feeding part, and the end part of the third transmission line is provided with a second power feeding part.
7. A pi decoupling network for a MIMO antenna array as claimed in claim 6,
the first transmission line is provided with a first stub, which is parallel or substantially parallel to the first coupling path.
8. A pi decoupling network for a MIMO antenna array as claimed in claim 6,
the third feeding terminal includes:
a fourth transmission line, one end of which is provided with a fifth transmission line and a sixth transmission line,
the end part of the fifth transmission line is provided with a third power feeding part, the end part of the sixth transmission line is provided with a fourth power feeding part, and the fourth transmission line is provided with a second branch.
9. A pi decoupling network for a MIMO antenna array according to claim 8, wherein the second stub is parallel or substantially parallel to the second coupling path.
10. The pi decoupling network for a MIMO antenna array of claim 8, wherein the combination of the first feed, the second feed, the third feed, and the fourth feed are square in shape and electrically connected to the first dielectric plate by probes, respectively,
the first power feeding part and the second power feeding part, and the third power feeding part and the fourth power feeding part are arranged diagonally.
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| CN117525880A (en) * | 2023-12-05 | 2024-02-06 | 安徽大学 | Coupling resonator decoupling network applied to mutual coupling inhibition of multiple antenna units |
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