CN114050397B - Dual-port chip integrated MIMO antenna based on TM10 mode - Google Patents
Dual-port chip integrated MIMO antenna based on TM10 mode Download PDFInfo
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- CN114050397B CN114050397B CN202110760874.7A CN202110760874A CN114050397B CN 114050397 B CN114050397 B CN 114050397B CN 202110760874 A CN202110760874 A CN 202110760874A CN 114050397 B CN114050397 B CN 114050397B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—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
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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Abstract
The invention discloses a dual-port chip integrated MIMO antenna based on TM10 mode, which is used for MIMO access point antenna application and comprises: the integrated chip module is arranged right above the ground plane and comprises a metal patch, four metal strips, four capacitor gaps, two arched patches, two conductive blind holes and two ports for feeding by probes. The metal strip is tuned to a resonant frequency of 3.5GHz and the conductive vias are placed on the ground plane and under the center of the patch to tune S12 to have a lower value. The TM10 mode modifies the excitation field distribution within the cavity such that a zero or very weak electric field excited by the first probe feed occurs in the vicinity of the second probe feed, thereby achieving the goal of increasing isolation between the antennas. The integrated chip integrated module is used in the antenna, so that the antenna is convenient to disassemble and replace, has the advantages of space saving and low cost, and can be applied to the MIMO antenna of the access point.
Description
The technical field is as follows:
the invention relates to chip integrated MIMO antenna design, in particular to a dual-port chip integrated MIMO antenna based on a TM10 mode, and belongs to the technical field of antennas.
The background art comprises the following steps:
the MIMO antennas need to generate different radiation patterns to meet the decoupling requirement between different channels of the MIMO system. Conventionally, it is necessary to have different feed ports excite resonant modes with orthogonal polarization characteristics on the antenna, so as to generate radiation beams with orthogonal polarization characteristics (for example, TM10 and TM01 modes of a square patch antenna). In this case, dual polarized antennas are required to have the same dimensions in two orthogonal directions, and therefore the aspect ratio (aspect ratio) of the antenna is required to be uniform, which limits its design flexibility in selecting a variable aspect ratio for a two port antenna.
Therefore, how to overcome the limitation of the aspect ratio of the antenna, and to excite different radiation modes with orthogonal characteristics (for example, two symmetric and orthogonal TM10 modes) in the same frequency band, on the basis of ensuring the comprehensive performance of the antenna, it is a problem to be urgently researched and solved to design a dual-port access point MIMO antenna meeting the practical application requirements.
Meanwhile, the chip integrated MIMO antenna designed integrally at present is also a hot spot, and the antenna is convenient to disassemble and replace, has the advantages of space saving and low cost, and is novel and practical.
The invention content is as follows:
the invention provides a dual-port chip integrated MIMO antenna based on TM10 mode, which uses an integrated chip module and two metal probes mounted above a metal floor for feeding, and connects arcuate patches at two opposite positions in the TM10 mode resonance direction. Two metal arcuate patches were placed on opposite sides of the center to excite their respective TM10 modes with good impedance matching.
The technical scheme adopted by the invention is as follows: the dual-port chip integrated MIMO antenna based on the TM10 mode comprises a metal floor, wherein an integrated chip module is welded right above the metal floor, the integrated chip module comprises a medium base layer, a metal patch, four metal strips, four capacitance gaps, two metal probes, two metal arched patches, a first feed port and a second feed port, and an additional decoupling structural unit formed by two metal blind holes is introduced into the middle of the integrated chip module.
Further, the size of the integrated chip module is 17.6 × 3.8 × 7mm 3 。
Furthermore, the thickness of the medium base layer is 7mm, the metal patches are printed on the upper surface of the medium base layer, four capacitor gaps are dug on the metal patches, two metal arch patches are arranged at a position 0.15mm away from the positions under the metal patches, two metal probes are arranged under the metal arch patches, and a first feed port and a second feed port are arranged under the metal probes.
Further, the diameter of the metal probe is 1.4mm, the height is 6.35mm, the metal arch patch is positioned at the center of the upper part of the metal probe and is formed by a round piece with the diameter of 3.6mm minus a small arch piece with the width of 0.8 mm.
Further, four metal strips are arranged on the outer surface of the medium base layer 2i, and the Y-axis direction is 7.5mm away from the center O point of the medium base layer, the height is 7mm, and the width is 0.4mm.
Furthermore, the length of four capacitor gaps dug in the metal patch is 0.6mm, and the width of the four capacitor gaps dug in the metal patch is 0.5mm.
Further, the probe feeds of the two metal probes are positioned at two opposite positions of the central line AB relative to the central point O of the metal patch, and each probe feed is placed at a position 1.45mm away from the central point O of the metal patch and is surrounded by the upper metal arch patch.
Further, the length of the metal probe is 6.85mm, and the diameter of the metal probe is 1.4mm.
Further, the diameter of the metal arch patch is 3.6mm.
Furthermore, the additional decoupling structure unit is located on the metal floor 1, the distance from the center O point of the metal patch in the x-axis direction is 0.7mm, the diameter is 0.7mm, the wall thickness is 0.04mm, and the height is 6.85mm.
Further, the overall shape of the metal floor is square, and the integrated chip module is installed in the middle of the metal floor with the size of 100mm x 100mm.
The invention has the following beneficial effects:
(1) The size of the integrated module chip is very small, and is only 17.6 multiplied by 3.8 multiplied by 7mm3, so that the free space volume occupied by the MIMO antenna array can be effectively reduced.
(2) The isolation degree of the port between the two antenna units is high, and 34dB isolation degree is achieved in a 3400-3600MHz frequency band.
(3) The radius of the conductive blind hole is small so as to modify the electric field distribution of the TM10 mode excited near the center of the cavity, and the manufacturing cost of the antenna and the complexity of the decoupling circuit are reduced.
Description of the drawings:
fig. 1 is a three-dimensional structural diagram of a MIMO chip antenna according to the present invention.
Fig. 2 is a top view of a MIMO chip antenna of the present invention.
Fig. 3 is a side view of a MIMO chip antenna of the present invention.
Fig. 4 is an S-parameter curve of the MIMO chip antenna of the present invention.
Fig. 5 shows the radiation efficiency when different ports in the MIMO chip antenna are excited.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings.
The invention discloses a dual-port chip integrated MIMO antenna based on a TM10 mode, which comprises a metal floor 1, wherein an integrated chip module 2 is welded right above the metal floor 1, the integrated chip module 2 comprises a medium base layer 2i, a metal patch 2a, four metal strips 2b, four capacitance gaps 2c, two metal probes 2d, two metal arched patches 2e, a first feed port 2g and a second feed port 2h, and an additional decoupling structure unit 2f formed by two metal blind holes is introduced into the middle of the integrated chip module 2.
The size of the integrated chip module 2 is 17.6 × 3.8 × 7mm 3 。
The thickness of medium basic unit 2i is 7mm, and medium basic unit 2 i's upper surface printing has metal paster 2a, digs four electric capacity gaps 2c on the metal paster 2a, is equipped with two metal bow-shaped pasters 2e apart from metal paster 2a under 0.15mm department, is equipped with two metal probes 2d under the metal bow-shaped pasters 2e, and the metal probes below is equipped with first feed port 2g and second feed port 2h.
The diameter of the metal probe 2d is 1.4mm, the height is 6.35mm, the metal arch patch 2e is positioned at the center of the upper part of the metal probe 2d and is formed by a wafer with the diameter of 3.6mm minus a small arch piece with the width of 0.8mm, and therefore impedance matching is adjusted.
The four metal strips 2b are positioned on the outer surface of the dielectric substrate 2i, and are 7.5mm away from the center O point of the dielectric substrate 2i in the Y-axis direction, 7mm in height and 0.4mm in width, so that the size of the antenna is reduced and impedance matching is adjusted.
Four capacitor slots 2c with the length of 0.6mm and the width of 0.5mm are dug on the metal patch (2 a), so that extra capacitors and inductors are introduced at the tail end of the metal strip, and the resonant frequency is reduced to 3.5GHz.
Probe feeds for two metal probes 2d (6.85 mm long, 1.4mm diameter) are located at two opposite positions of the centre line AB relative to the centre (point O) of the metal patch 2a to excite the fundamental resonant mode (TM 10 mode) of the antenna. Each probe feed is placed 1.45mm from the center (O point) of the metal patch 2a and surrounded by an overlying metal arcuate patch 2e (3.6 mm diameter) to compensate for the inductance caused by the 6.35mm long metal post to achieve good impedance matching to excite the TM10 mode.
The additional decoupling structure unit 2f is positioned on the metal floor 1, the distance from the center O point of the metal patch 2a in the x-axis direction is 0.7mm, the diameter is 0.7mm, the wall thickness is 0.04mm, and the height is 6.85mm.
The overall shape of the metal floor 1 is square, and the integrated chip module (2) is arranged in the middle of the metal floor 1 with the size of 100mm x 100mm.
The following is a detailed description of an embodiment of a MIMO antenna covering the 3.5GHz band in 5G Sub-6GHz applications:
the three-dimensional structure of the MIMO chip antenna of the invention is shown in figure 1, and the lowest part is a metal floor 1 (100 multiplied by 100 mm) 2 ). On the metal floor 1 is an integrated chip module 2 with a volume of 17.6 × 3.8 × 7mm 3 The integrated chip module 2 comprises an FR-4 dielectric substrate 2i, four capacitance slots 2c are etched on a metal patch 2a on the upper surface of the dielectric substrate 2i, and probe feeds of two metal probes (6.85 mm in length and 1.4mm in diameter) are positioned at two opposite positions of a central line AB relative to the center (point O) of the patch so as to excite a basic resonance mode (TM 10 mode) of the antenna. The feed for each probe was placed 1.45mm from the center of the patch and surrounded by an overlying metal arcuate patch 2e (3.6 mm diameter) to compensate for the inductance caused by the 6.35mm long metal post to achieve good impedance matching to excite the TM10 mode. The conductive blind hole 2f of the decoupling structure is positioned on the metal floor, the distance from the center O point in the x-axis direction is 0.7mm, the diameter is 0.7mm, the wall thickness is 0.04mm, and the height is 6.85mm.
The central operating frequency of the embodiment is selected to be 3.5GHz, the operating bandwidth is 3400-3600MHz, and the frequency band is a newly added frequency band of 5G mobile communication below 6 GHz.
Fig. 2 is a top view of the MIMO chip antenna of the present embodiment. The four capacitor gaps are centrosymmetric with each other, the two metal probes are symmetric with respect to an X axis, and the two conductive blind holes are symmetric with respect to a Y axis.
Fig. 3 is a side view of the MIMO chip antenna of the present embodiment. The metal probe and the uppermost metal patch have a gap of 0.15mm to form a parallel plate capacitor, so that better impedance matching is achieved.
Fig. 4 is an S-parameter curve of the MIMO chip antenna of the present embodiment. Both sub-antenna elements resonate at around 3.5GHz. S11 is the reflection coefficient of the first feed port 2h with a-6 dB bandwidth of about 31%, and S22 is the reflection coefficient of the second feed port 2g with a-6 dB bandwidth of about 31%. The bandwidth of the coincidence of the two ports covers the 3400-3600MHz band. In this band, the isolation of the two ports is represented by S12, and the isolation reaches 22dB at the frequency of 3.5GHz.
Fig. 5 shows the total efficiency of the MIMO chip antenna of the present embodiment. In the frequency band range of 3400-3600MHz, the total efficiency when the first feed port 2h is excited and the second feed port 2g is excited is better than 64%.
The chip integrated module with integrated design is used in the MIMO antenna, is convenient to disassemble and replace, has the advantages of space saving and low cost, and has good application prospect in MIMO access points
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (7)
1. The utility model provides a dual-port chip integrated MIMO antenna based on TM10 mode which characterized in that: the metal floor comprises a metal floor (1), wherein an integrated chip module (2) is welded right above the metal floor (1), the integrated chip module (2) comprises a medium base layer (2 i), and a metal patch (2 a), four metal strips (2 b), four capacitance gaps (2 c), two metal probes (2 d), two metal arched patches (2 e), a first feed port (2 g) and a second feed port (2 h) which are positioned on the medium base layer (2 i), and an additional decoupling structural unit (2 f) formed by two metal blind holes is introduced into the middle of the integrated chip module (2);
the thickness of the medium base layer (2 i) is 7mm, the metal patches (2 a) are printed on the upper surface of the medium base layer (2 i), four capacitance gaps (2 c) are dug on the metal patches (2 a), two metal arched patches (2 e) are arranged at positions 0.15mm away from the metal patches (2 a), two metal probes (2 d) are arranged under the metal arched patches (2 e), and a first feed port (2 g) and a second feed port (2 h) are arranged below the metal probes;
the diameter of the metal probe (2 d) is 1.4mm, the height is 6.35mm, the metal arch patch (2 e) is positioned at the right center above the metal probe (2 d) and is formed by subtracting a small arch piece with the width of 0.8mm from a wafer with the diameter of 3.6 mm;
the four metal strips (2 b) are positioned on the outer surface of the medium base layer (2 i), and are 7.5mm away from the O point of the center of the medium base layer (2 i) in the Y-axis direction, 7mm in height and 0.4mm in width;
the additional decoupling structure unit (2 f) is located on the metal floor (1), the distance from the center O point of the metal patch (2 a) in the x-axis direction is 0.7mm, the diameter is 0.7mm, the wall thickness is 0.04mm, and the height is 6.85mm.
2. A dual port chip integrated MIMO antenna based on TM10 mode according to claim 1, characterized in that: the size of the integrated chip module (2) is 17.6 multiplied by 3.8 multiplied by 7mm 3 。
3. The dual port chip integrated MIMO antenna based on TM10 mode of claim 1, wherein: the length of four capacitor gaps (2 c) dug on the metal patch (2 a) is 0.6mm, and the width is 0.5mm.
4. The dual port chip integrated MIMO antenna based on TM10 mode of claim 1, wherein: the probe feeds of the two metal probes (2 d) are positioned at two opposite positions of the central line AB relative to the central point O of the metal patch (2 a), and each probe feed is placed at 1.45mm from the central point O of the metal patch (2 a) and is surrounded by the upper metal arch patch (2 e).
5. The dual port chip integrated MIMO antenna based on TM10 mode of claim 4, wherein: the length of the metal probe (2 d) is 6.85mm, and the diameter of the metal probe is 1.4mm.
6. The dual port chip integrated MIMO antenna based on TM10 mode of claim 5, wherein: the diameter of the metal arch patch (2 e) is 3.6mm.
7. The dual port chip integrated MIMO antenna based on TM10 mode of claim 1, wherein: the metal floor (1) is square in overall shape, and the integrated chip module (2) is installed in the middle of the metal floor (1) with the size of 100mm x 100 mm.
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| CN202110760874.7A CN114050397B (en) | 2021-07-06 | 2021-07-06 | Dual-port chip integrated MIMO antenna based on TM10 mode |
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| CN202110760874.7A CN114050397B (en) | 2021-07-06 | 2021-07-06 | Dual-port chip integrated MIMO antenna based on TM10 mode |
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| CN114050397A CN114050397A (en) | 2022-02-15 |
| CN114050397B true CN114050397B (en) | 2022-11-25 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638365A (en) * | 2014-12-25 | 2015-05-20 | 中国电子科技集团公司第七研究所 | Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure |
| CN106469848A (en) * | 2015-08-20 | 2017-03-01 | 南京理工大学 | A kind of broadband paster antenna based on double resonance pattern |
| CN111987458A (en) * | 2020-07-30 | 2020-11-24 | 南京理工大学 | Decoupling structure between adjacent rectangular patches in dual-frequency antenna array |
| CN112615143A (en) * | 2020-11-24 | 2021-04-06 | 中国电子科技集团公司第三十八研究所 | Planar broadband wide-angle scanning phased array antenna unit and phased array antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486775A (en) * | 2016-11-25 | 2017-03-08 | 华南理工大学 | A kind of low section double frequency-band filtering paster antenna and its composition mimo antenna |
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- 2021-07-06 CN CN202110760874.7A patent/CN114050397B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104638365A (en) * | 2014-12-25 | 2015-05-20 | 中国电子科技集团公司第七研究所 | Four-unit broadband slot MIMO (Multiple Input Multiple Output) antenna without decoupling structure |
| CN106469848A (en) * | 2015-08-20 | 2017-03-01 | 南京理工大学 | A kind of broadband paster antenna based on double resonance pattern |
| CN111987458A (en) * | 2020-07-30 | 2020-11-24 | 南京理工大学 | Decoupling structure between adjacent rectangular patches in dual-frequency antenna array |
| CN112615143A (en) * | 2020-11-24 | 2021-04-06 | 中国电子科技集团公司第三十八研究所 | Planar broadband wide-angle scanning phased array antenna unit and phased array antenna |
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