CN112421231A - High-isolation antenna - Google Patents
High-isolation antenna Download PDFInfo
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- CN112421231A CN112421231A CN202011144272.0A CN202011144272A CN112421231A CN 112421231 A CN112421231 A CN 112421231A CN 202011144272 A CN202011144272 A CN 202011144272A CN 112421231 A CN112421231 A CN 112421231A
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- 238000002955 isolation Methods 0.000 title claims abstract description 69
- 229910052751 metal Inorganic materials 0.000 claims abstract description 109
- 239000002184 metal Substances 0.000 claims abstract description 105
- 239000000758 substrate Substances 0.000 claims abstract description 71
- 239000011188 CEM-1 Substances 0.000 claims description 4
- 101100257127 Caenorhabditis elegans sma-2 gene Proteins 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 29
- 238000005516 engineering process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Classifications
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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
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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
-
- 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
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
Abstract
The invention discloses a high-isolation antenna, which comprises: the antenna comprises a substrate, at least one first antenna metal piece, at least one second antenna metal piece and at least two radio frequency cable feeders; a metal layer is arranged on the second surface of the substrate, and a defected ground structure is arranged on the second surface of the substrate; all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, and a feed pin of each first antenna metal part or each second antenna metal part is fixed on the substrate; and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece. The invention has simple structure and lower cost, can effectively improve the isolation between the multiple antennas and optimize the overall performance of the multiple antenna system.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a high-isolation antenna.
Background
With the development of wireless communication technology, 5G technology is being widely researched on the basis of the development of 3G and 4G, and multi-antenna technology is a major breakthrough of antenna technology in the field of wireless mobile communication. The multi-antenna technology can improve the capacity and the spectrum utilization rate of a communication system by times without increasing the bandwidth, and is a key technology adopted by a new generation of mobile communication system.
In order to improve the isolation of a multi-antenna system, the traditional layout is to place antennas as far as possible, but at present, the requirements of terminal products on the appearance are higher and higher, the miniaturization of the products becomes a necessary trend in the future, so that the ideal situation that the antennas cannot be placed at a certain distance is limited, and the isolation of the antennas cannot meet the requirements.
In addition, under the same size space and the same specification condition, the isolation of the existing multi-antenna system is only about 15dB, the isolation is low, the omni-directionality is also poor, and the antenna design requirements of the current 802.11AX protocol are difficult to meet. And common module antenna adopts double-deck PCB structure, utilizes microstrip line feed, but microstrip line's impedance control requirement is higher, therefore not only the structure is complicated, and the cost is also very high.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a high-isolation antenna, which has a simple structure, and can effectively improve the isolation between multiple antennas and optimize the overall performance of a multiple-antenna system.
In order to achieve the above object, an embodiment of the present invention provides a high-isolation antenna, including: the antenna comprises a substrate, at least one first antenna metal piece, at least one second antenna metal piece and at least two radio frequency cable feeders;
a metal layer is arranged on the second surface of the substrate, and a defected ground structure is arranged on the second surface of the substrate;
all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, and a feed pin of each first antenna metal part or each second antenna metal part is fixed on the substrate;
and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece.
Further, the defected ground structure comprises two grooves formed in the center of the second surface of the substrate in a crossed manner and a circular through hole formed at the intersection of the two grooves.
Further, the number of the first antenna metal pieces is equal to the number of the second antenna metal pieces.
Furthermore, the first antenna metal part is symmetrically arranged on the first surface of the substrate, the second antenna metal part is symmetrically arranged on the first surface of the substrate, and the first antenna metal part and the second antenna metal part are arranged at intervals and are both close to the edge of the first surface of the substrate.
Furthermore, the feed pin of each first antenna metal piece or the second antenna metal piece is fixed on the substrate through a pad.
Furthermore, the first antenna metal part and the second antenna metal part both adopt inverted-F antennas.
Further, the working frequency band of the first antenna metal piece is 2.5GHz, and the working frequency band of the second antenna metal piece is 5 GHz.
Furthermore, the substrate is a single panel made of CEM-1 material.
Compared with the prior art, the high-isolation antenna provided by the embodiment of the invention has the beneficial effects that: a metal layer is arranged on the second surface of the substrate, and a defected ground structure is arranged on the second surface of the substrate; all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, and a feed pin of each first antenna metal part or each second antenna metal part is fixed on the substrate; and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece. The embodiment of the invention has simple structure and lower cost, can effectively improve the isolation among multiple antennas and optimize the overall performance of a multi-antenna system.
Drawings
Fig. 1 is a schematic structural diagram of a first surface of a substrate in a preferred embodiment of a high-isolation antenna provided in the present invention;
fig. 2 is a schematic structural diagram of a second surface of a substrate in a preferred embodiment of a high-isolation antenna provided in the present invention;
fig. 3 is a schematic structural diagram of a first antenna metal part in a preferred embodiment of the high-isolation antenna provided in the present invention;
fig. 4 is a schematic structural diagram of a second antenna metal piece in a preferred embodiment of the high-isolation antenna provided in the present invention;
fig. 5 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 45 ° when the operating frequency band is 2.44 GHz;
fig. 6 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 30 ° when the operating frequency band is 2.44 GHz;
fig. 7 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 15 ° when the operating frequency band is 2.44 GHz;
fig. 8 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 45 ° when the operating frequency band is 5.20 GHz;
fig. 9 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 30 ° when the operating frequency band is 5.20 GHz;
fig. 10 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 15 ° when the operating frequency band is 5.20 GHz;
fig. 11 is a 45 ° downward-tilted directional diagram of the high-isolation antenna provided by the present invention when the operating frequency band is 5.80 GHz;
fig. 12 is a directional diagram of a high-isolation antenna provided by the present invention, which is tilted down by 30 ° when the operating frequency band is 5.80 GHz;
fig. 13 is a directional diagram of a high-isolation antenna provided by the present invention, which has a down tilt of 15 ° when the operating frequency band is 5.80 GHz.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a first surface of a substrate in a preferred embodiment of a high-isolation antenna provided in the present invention, and fig. 2 is a schematic structural diagram of a second surface of the substrate in a preferred embodiment of a high-isolation antenna provided in the present invention. The high isolation antenna comprises: the antenna comprises a substrate 1, at least one first antenna metal piece 2, at least one second antenna metal piece 3 and at least two radio frequency cable feeder lines 4;
a metal layer is arranged on the second surface of the substrate 1, and a defected ground structure is arranged on the second surface;
all the first antenna metal parts 2 and the second antenna metal parts 3 are arranged on the first surface of the substrate 1, and a feed pin of each first antenna metal part 2 or each second antenna metal part 3 is fixed on the substrate 1;
all the radio frequency cable feeder lines 4 are located on the second surface of the substrate 1, and each radio frequency cable feeder line 4 is connected with a coplanar waveguide structure 5 preset according to a feed pin of each first antenna metal piece 2 or each second antenna metal piece 3.
It should be noted that, on the second surface of the substrate, a coplanar waveguide structure is preset on the feed pin of each first antenna metal piece or each second antenna metal piece, and the coplanar waveguide structure includes a central strip, one end of each radio frequency cable feeder is connected with the central strip of the coplanar waveguide structure, and the other end is connected with the radio frequency end.
In the embodiment, the second surface of the substrate is provided with the defected ground structure, so that a coupling path between the antennas on the substrate is effectively cut off, thereby realizing the current on the substrate to be divided and improving the isolation between the antennas; by designing the size of the preset coplanar waveguide structure, specific band-stop characteristics can be obtained, so that the purposes of optimizing in-band matching and inhibiting out-band radiation are achieved, and the overall performance of the multi-antenna system is optimized.
In another preferred embodiment, the defected ground structure includes two channels crossing at a central position of the second surface of the substrate and a circular through hole crossing at the crossing of the two channels.
It should be noted that, two slot ways are crosswise formed in the center of the second surface of the substrate, and an angle between the two slot ways may be adjusted according to the size of the substrate, so as to achieve optimal current splitting and improve isolation between antennas.
In yet another preferred embodiment, the number of the first antenna metallic pieces and the number of the second antenna metallic pieces are equal.
Specifically, the first antenna metal piece and the second antenna metal piece are symmetrically arranged on the first surface of the substrate, and the first antenna metal piece and the second antenna metal piece are arranged at intervals, so that the number of the first antenna metal pieces is equal to that of the second antenna metal pieces, and the high-isolation antenna is ensured to have good omni-directionality.
In yet another preferred embodiment, the first antenna metal parts are symmetrically disposed on the first surface of the substrate, the second antenna metal parts are symmetrically disposed on the first surface of the substrate, and the first antenna metal parts and the second antenna metal parts are disposed at intervals and both are disposed near an edge of the first surface of the substrate.
In yet another preferred embodiment, the feed pin of each of the first antenna metal piece or the second antenna metal piece is fixed on the substrate by a pad.
Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a first antenna metal element in a preferred embodiment of a high-isolation antenna provided in the present invention, and fig. 4 is a schematic structural diagram of a second antenna metal element in a preferred embodiment of a high-isolation antenna provided in the present invention
In still another preferred embodiment, the first antenna metal part and the second antenna metal part both adopt inverted F antennas, so as to reduce the height of the antenna and achieve the purpose of product miniaturization.
In another preferred embodiment, the operating frequency band of the first antenna metal part is 2.5GHz, and the operating frequency band of the second antenna metal part is 5 GHz.
In another preferred embodiment, the substrate is a single panel made of CEM-1 material, thereby reducing the cost.
In specific implementation, the substrate is a single-sided plate made of a CEM-1 material, and the first antenna metal part and the second antenna metal part are both inverted F antennas; the second surface of the substrate is provided with a metal layer and a defected ground structure, wherein the defected ground structure comprises two grooves which are formed in the center of the second surface of the substrate in a crossed manner and a circular through hole which is formed in the crossed position of the two grooves; all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, feed pins of each first antenna metal part or each second antenna metal part are fixed on the substrate through bonding pads, the first antenna metal parts are symmetrically arranged on the first surface of the substrate, the second antenna metal parts are symmetrically arranged on the first surface of the substrate, and the first antenna metal parts and the second antenna metal parts are arranged at intervals and are arranged close to the edge of the first surface of the substrate; and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece.
Referring to fig. 5, fig. 6 and fig. 7, fig. 5 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 45 ° downward inclination when the operating frequency band is 2.44GHz, fig. 6 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 30 ° downward inclination when the operating frequency band is 2.44GHz, and fig. 7 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 15 ° downward inclination when the operating frequency band is 2.44 GHz.
When the working frequency band of the high-isolation antenna is 2.44GHz, the antenna tilts 45 degrees, 30 degrees and 15 degrees downwards, a directional diagram has no obvious salient points, the antenna is complementary and omnidirectional, the high-isolation antenna has good omni-directionality, good coverage can be realized, and the overall performance of a multi-antenna system is improved.
Referring to fig. 8, 9 and 10, fig. 8 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 45 ° downward inclination when the operating frequency band is 5.20GHz, fig. 9 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 30 ° downward inclination when the operating frequency band is 5.20GHz, and fig. 10 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 15 ° downward inclination when the operating frequency band is 5.20 GHz.
When the working frequency band of the high-isolation antenna is 5.20GHz, the antenna tilts 45 degrees, 30 degrees and 15 degrees downwards, a directional diagram has no obvious salient points, the antenna is complementary and omnidirectional, the high-isolation antenna has good omni-directionality, good coverage can be realized, and the overall performance of a multi-antenna system is improved.
Referring to fig. 11, 12 and 13, fig. 11 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 45 ° downward inclination when the working frequency band is 5.80GHz, fig. 12 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 30 ° downward inclination when the working frequency band is 5.80GHz, and fig. 13 is a directional diagram of a high-isolation antenna provided by the present invention, which has a 15 ° downward inclination when the working frequency band is 5.80 GHz.
When the working frequency band of the high-isolation antenna is 5.80GHz, the antenna tilts 45 degrees, 30 degrees and 15 degrees downwards, a directional diagram has no obvious salient points, the antenna is complementary and omnidirectional, the high-isolation antenna has good omni-directionality, good coverage can be realized, and the overall performance of a multi-antenna system is improved.
Therefore, the high-isolation antenna provided by the invention has good omni-directionality in each working frequency band, is wide in signal coverage range, and improves the overall performance of a multi-antenna system.
It should be noted that, in the research and development process, the inventor of the present invention obtains the high-isolation antenna provided by the present invention through testing under certain conditions that the return loss of the antenna is less than-10 dB in the working frequency band of 2.4 to 2.5GHz and 5.15 to 5.85GHz, and the signal transmission efficiency is high. Meanwhile, the in-band isolation of the 2G antenna in the high-isolation antenna is integrally greater than 20dB, the in-band isolation of the 5G antenna is integrally greater than 25dB, and the inter-band isolation of the 2G antenna and the 5G antenna in a 5.15-5.85 GHz working frequency band is integrally greater than 25dB, so that the isolation between the antennas in the high-isolation antenna is high. However, the test data is obtained only under a certain communication condition and test condition, and may be different from the test data in a specific application, and the data is not limited to the isolation achieved by the present invention.
According to the high-isolation antenna provided by the embodiment of the invention, the metal layer is arranged on the second surface of the substrate, and the defected ground structure is arranged; the defected ground structure comprises two groove paths which are formed in the center of the second surface of the substrate in a crossed mode and a circular through hole formed in the crossed position of the two groove paths; all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, and a feed pin of each first antenna metal part or each second antenna metal part is fixed on the substrate; and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece. The embodiment of the invention has simple structure and lower cost, can effectively improve the isolation among multiple antennas and optimize the overall performance of a multi-antenna system.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A high isolation antenna, comprising: the antenna comprises a substrate, at least one first antenna metal piece, at least one second antenna metal piece and at least two radio frequency cable feeders;
a metal layer is arranged on the second surface of the substrate, and a defected ground structure is arranged on the second surface of the substrate;
all the first antenna metal parts and the second antenna metal parts are arranged on the first surface of the substrate, and a feed pin of each first antenna metal part or each second antenna metal part is fixed on the substrate;
and all the radio frequency cable feeder lines are positioned on the second surface of the substrate, and each radio frequency cable feeder line is connected with a coplanar waveguide structure preset according to a feed pin of each first antenna metal piece or each second antenna metal piece.
2. The high-isolation antenna as claimed in claim 1, wherein the defected ground structure includes two slots crossing at a central position of the second surface of the substrate and a circular through hole crossing the two slots.
3. The high isolation antenna of claim 1, wherein the number of first antenna metallic elements and the number of second antenna metallic elements are equal.
4. The high-isolation antenna according to claim 3, wherein the first antenna metal parts are symmetrically disposed on the first surface of the substrate, the second antenna metal parts are symmetrically disposed on the first surface of the substrate, and the first antenna metal parts and the second antenna metal parts are spaced apart and disposed close to an edge of the first surface of the substrate.
5. The high-isolation antenna as claimed in claim 1, wherein the feeding pin of each of the first antenna metal piece or the second antenna metal piece is fixed on the substrate by a bonding pad.
6. The high isolation antenna of claim 5, wherein the first antenna metallic element and the second antenna metallic element are inverted-F antennas.
7. The high-isolation antenna of claim 6, wherein the first antenna metal part has an operating frequency band of 2.5GHz, and the second antenna metal part has an operating frequency band of 5 GHz.
8. The high-isolation antenna as claimed in any one of claims 1 to 7, wherein the substrate is a single-sided board made of CEM-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011144272.0A CN112421231A (en) | 2020-10-23 | 2020-10-23 | High-isolation antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011144272.0A CN112421231A (en) | 2020-10-23 | 2020-10-23 | High-isolation antenna |
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| CN112421231A true CN112421231A (en) | 2021-02-26 |
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| CN202011144272.0A Pending CN112421231A (en) | 2020-10-23 | 2020-10-23 | High-isolation antenna |
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