CN106252848B - Compact high-isolation antenna - Google Patents
Compact high-isolation antenna Download PDFInfo
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- CN106252848B CN106252848B CN201610784913.6A CN201610784913A CN106252848B CN 106252848 B CN106252848 B CN 106252848B CN 201610784913 A CN201610784913 A CN 201610784913A CN 106252848 B CN106252848 B CN 106252848B
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- antenna
- circuit board
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- arm
- conduction band
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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
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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
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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
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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Abstract
The invention provides a compact high-isolation antenna which comprises a printed circuit board, wherein an annular ground radiation antenna is arranged on the printed circuit board, a monopole antenna is arranged above the annular ground radiation antenna, the annular ground radiation antenna comprises a clearance area arranged on the printed circuit board and a metal conduction band arranged in the clearance area and connected with a non-clearance area of the printed circuit board, the monopole antenna comprises a feed arm and a radiation arm, one end of the feed arm is connected with a first feed source of the printed circuit board, and the other end of the feed arm is connected with the radiation arm; wherein the radiation arm is located in a range above the printed circuit board corresponding to the clearance area. The antenna combines the annular ground radiation antenna and the symmetrical arm monopole antenna, and can realize higher isolation under the condition that the positions of the two antennas are superposed by utilizing the orthogonal characteristic of ground radiation currents of the two antennas, and the antenna has the advantages of simple structure, various changes and better effect of realizing the optimal isolation.
Description
Technical Field
The invention relates to the technical field of antenna design of mobile terminal equipment, in particular to a compact high-isolation antenna.
Background
MIMO is widely used in digital communication standards such as LTE, 802.11.ac, as a technical measure for effectively improving data throughput. MIMO requires multiple antennas integrated on the terminal device to achieve multi-path data concurrency, and in order to ensure that the correlation coefficient between data links is less than 0.5 or lower, the isolation between each antenna is at least greater than 10 dB. The distance between the antennas is difficult to ensure to be large enough due to the limitation of the size of the terminal equipment, and therefore, how to achieve high isolation between the antennas inside the crowded terminal equipment brings great challenges to antenna design.
Heretofore, for antennas placed at the edge of a printed wiring board, conventional technical measures for improving the isolation between antennas mainly include: the neutralization line is coupled to a decoupling matching network. The isolation of the neutralization line pair is improved limitedly, and the decoupling matching network needs to occupy a certain area of a printed circuit board and has limited bandwidth.
Disclosure of Invention
The invention aims to provide a compact high-isolation antenna to solve the problems that the existing terminal equipment is greatly limited by the size when the isolation between the antennas is improved, so that the antenna design is limited by the size of the terminal equipment and the isolation is relatively poor.
In order to achieve the above object, the present invention provides a compact high-isolation antenna, including a printed circuit board, wherein an annular ground radiation antenna is arranged on the printed circuit board, a monopole antenna is arranged above the annular ground radiation antenna, the annular ground radiation antenna includes a clearance area arranged on the printed circuit board and a metal conduction band arranged in the clearance area and connected to a non-clearance area of the printed circuit board, the monopole antenna includes a feed arm and a radiation arm, one end of the feed arm is connected to a first feed source of the printed circuit board, and the other end of the feed arm is connected to the radiation arm;
wherein the radiation arm is located in a range above the printed circuit board corresponding to the clearance area.
Preferably, the radiating arm is located directly above a centerline of the clearance zone.
Preferably, the monopole antenna is a symmetric monopole antenna, the radiating arm is a symmetric radiating arm, and the other end of the feeding arm is connected to the middle of the symmetric radiating arm.
Preferably, the annular ground radiation antenna and the symmetric-arm monopole antenna are disposed at an edge of one side of the printed circuit board, and the annular ground radiation antenna is printed on the edge of the printed circuit board.
Preferably, the metal conduction band includes a ground metal conduction band and a feed metal conduction band, and the ground metal conduction band and the feed metal conduction band are respectively connected to the ground plane of the printed circuit board.
Preferably, one end of the feed metal conduction band is connected to the ground plane of the printed circuit board through a first capacitor, the other end of the feed metal conduction band is directly connected to a second feed source located on the side of the clearance area adjacent to the edge of the printed circuit board, one end of the ground metal conduction band is connected to the ground plane of the printed circuit board through a second capacitor, and the other end of the ground metal conduction band is directly connected to the printed circuit board.
Preferably, one end of the feed metal conduction band is connected with the ground plane of the printed circuit board through a first capacitor, and the other end of the feed metal conduction band is vertically connected with a second feed source which is positioned on one side of the clearance area opposite to the edge of the printed circuit board; two ends of the grounding metal conduction band are connected with the printed circuit board, and a second capacitor is arranged in the middle of the grounding metal conduction band.
Preferably, one end of the feed metal conduction band is connected to the second feed source on the printed circuit board, the other end of the feed metal conduction band is vertically connected to one end of the ground metal conduction band, an inductor is arranged in the middle of the feed metal conduction band, and the other end of the ground metal conduction band is connected to the ground plane of the printed circuit board through a capacitor.
The compact high-isolation antenna provided by the invention has the following beneficial effects:
(1) the antenna combines the annular ground radiation antenna and the symmetrical arm monopole antenna, and can realize higher isolation under the condition that the positions of the two antennas are superposed by utilizing the characteristic that the ground radiation currents of the two antennas are orthogonal;
(2) the antenna has simple structure, various changes and better effect of realizing optimal isolation.
Drawings
Fig. 1 is an overall schematic diagram of a compact high-isolation antenna provided by the present invention;
FIG. 2 is an enlarged schematic view of the compact high-isolation antenna provided in FIG. 1;
fig. 3 is a diagram of a return loss test result of the compact high-isolation antenna according to the first embodiment of the present invention;
fig. 4 is a diagram illustrating a test result of the total radiation efficiency of the compact high-isolation antenna according to the first embodiment of the present invention;
fig. 5 is a diagram illustrating a test result of the separation degree of the compact high-isolation antenna according to the first embodiment of the present invention;
fig. 6 is a diagram illustrating a result of testing an envelope correlation coefficient between compact high-isolation antennas according to a first embodiment of the present invention;
fig. 7 is a current distribution diagram of a symmetric monopole antenna according to a first embodiment of the present invention;
fig. 8 is a current distribution diagram of a loop ground radiation antenna according to a first embodiment of the present invention;
fig. 9 is a diagram illustrating a test result of the variation of the isolation between the antennas according to the first embodiment of the present invention;
fig. 10 is a schematic structural diagram of a loop ground radiation antenna according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a loop ground radiation antenna according to a third embodiment of the present invention.
Detailed Description
To better illustrate the present invention, a preferred embodiment is described in detail with reference to the accompanying drawings, in which:
as shown in fig. 1, the compact high-isolation antenna provided by the present invention includes a printed circuit board 1, a loop-shaped ground radiation antenna 3 is disposed on the printed circuit board 1, and a monopole antenna 2 is disposed above the loop-shaped ground radiation antenna 3 of the printed circuit board 1. As shown in fig. 2, the annular ground radiation antenna 3 includes a clearance area 32 disposed on the printed circuit board 1 and a metal conduction band disposed in the clearance area 32 and connected to a non-clearance area of the printed circuit board 1, the monopole antenna 2 includes a feed arm 22 and a radiation arm 23, one end of the feed arm 22 is connected to the first feed source of the printed circuit board 1, and the other end is connected to the radiation arm 23.
Here, the radiation arm 23 is located in a range above the printed wiring board 1 corresponding to the clearance area 32, that is, a projection of the radiation arm 23 is located in a range where the clearance area 32 is located, as viewed downward from the direction of the Z axis of fig. 1.
The specific structure of the antenna is shown in the following preferred embodiments:
the first embodiment is as follows:
referring to fig. 1 again, in this embodiment, a high-isolation 2.4GHz WIFI antenna is taken as an example, and the details are as follows:
the annular ground radiation antenna 3 and the monopole antenna 2 in the present embodiment are disposed at the edge of one side of the printed wiring board 1, and the annular ground radiation antenna 3 is printed on the edge of the printed wiring board 1. The metal conduction band of the annular ground radiation antenna 3 includes a ground metal conduction band 34 and a feed metal conduction band 33, and the ground metal conduction band 34 and the feed metal conduction band 33 are respectively connected to the ground plane of the printed circuit board 11. One end of the feed metal conduction band 33 is connected with the ground plane of the printed circuit board 1 through a capacitor 35, the other end of the feed metal conduction band 33 is directly connected with the feed source 31 which is positioned at one side of the clearance area 32 adjacent to the edge of the printed circuit board 1, one end of the grounding metal conduction band 34 is connected with the ground plane of the printed circuit board 1 through a capacitor 36, and the other end of the grounding metal conduction band is directly connected with the printed circuit board 1. The working principle of the annular ground radiation antenna is as follows: the current radiation of the printed circuit board 1 is excited by magnetic field coupling, and a radiation resonant loop is formed by the ground plane inductance of the printed circuit board 1 and the capacitor 36, so that the capacitance value of the capacitor 36 influences the resonant frequency, the magnetic field coupling exists between the feed metal conduction band 33 and the grounding metal conduction band 34, the mutual inductance appears on the circuit, and the capacitor 34 influences the mutual inductance between the feed metal conduction band 33 and the grounding metal conduction band 34, thereby influencing the resonant depth.
Preferably, the monopole antenna 2 in this embodiment is configured as a symmetric monopole antenna, the radiation arm 23 is a symmetric radiation arm, and the other end of the feed arm 22 is connected to the middle of the symmetric radiation arm. The open coupling electric field between the symmetrical radiation arm of the symmetrical arm monopole antenna and the printed circuit board can form effective radiation, and the required resonant frequency can be realized by adjusting the length of the symmetrical radiation arm. And the best isolation can be achieved by adjusting the position of the first feed source.
Adjusting the relative position of the radiation arms 23 with respect to the clearance area may achieve an optimal isolation. In the present embodiment, the radiation arm 23 is located directly above the center line of the clearance area 32. That is, the projection of the radiation arm 23 coincides with the center line (dotted line in fig. 1) of the clearance 32, as viewed downward in the direction of the Z-axis of fig. 1. In other preferred embodiments, the radiation arm 23 is located in the region above the clearance area 32, and the best isolation is achieved by adjusting the position, structure, parameters, etc. of each device (such as the position of the feed source, the value of the capacitor, the form of the metal conduction band, etc.).
Referring to fig. 3, which is a simulation result of return loss of the symmetric-arm monopole antenna and the annular ground radiation antenna, by tuning the length of the radiation arm 23 of the symmetric-arm monopole antenna and the capacitors 35 and 36, the two antennas can cover 2.4 to 2.48GHz, the length of the symmetric-arm monopole antenna in the simulation is 20 mm, the size of the headroom of the annular ground radiation antenna is 5 × 3mm, and both the capacitors 35 and 36 are 0.5 pF.
Referring to fig. 4, which shows the total radiation efficiency of the symmetric monopole antenna and the annular ground radiation antenna, the total radiation efficiency of the two antennas is greater than-1 dB from the simulation results.
Referring to fig. 5, the isolation between the symmetric-arm monopole antenna and the loop ground radiating antenna is less than 15dB in-band from the simulation results.
Referring to fig. 6, the envelope correlation coefficient between the symmetric-arm monopole antenna and the loop ground radiation antenna is less than 0.01 in a band.
The principle of the present invention can be explained by referring to fig. 7 and the reference diagram, where fig. 7 shows a current vector distribution diagram on the printed circuit board when the symmetric arm monopole antenna works, and it can be seen from the diagram that the current vector diverges radially outward with the feeding point as the center, and fig. 8 shows the current distribution on the printed circuit board when the annular ground radiator antenna works, and it can be seen from the diagram that the current vector distributes circumferentially around the feeding point as the center, and compared with the two phases, it is easy to find that the symmetric arm monopole antenna and the annular ground radiation antenna are approximately perpendicular to each other at the ground current distribution, which means that the near-field energy coupling between the two is very weak. Based on this feature, a monopole antenna and a loop ground radiator antenna are combined.
Specifically, based on the practical application and the current vector diagrams shown in fig. 7 and 8, the main factors affecting the isolation between the symmetric-arm monopole antenna and the annular ground radiator antenna include the distance between the two antennas and the symmetry of the symmetric-arm monopole antenna. Unlike conventional antennas, the isolation between the circularly radiating antenna and the symmetric-arm monopole antenna does not decrease as the distance between the two increases, but the antenna isolation is the greatest when the two are the closest.
As shown in fig. 9, the isolation between the circularly radiating antenna and the symmetric-arm monopole antenna varies with the distance between the antennas, where the distance between the antennas is the distance in the y direction in fig. 1. As can be seen from the results, when the distance between the two antennas in the y direction is 0, that is, when the center line of the loop-shaped radiation antenna clearance area coincides with the center line (feed arm) of the monopole antenna when viewed from above the printed wiring board, the isolation between the two antennas is the best. The reason for this is that: the ground radiation current patterns caused by the two antennas are symmetrical left and right about the center line of the antennas, and the directions are different, when the two antennas are overlapped, the currents at all positions are mutually vertical, so that the isolation degree is the best, and when the antenna positions are not overlapped, the currents at all positions cannot be mutually vertical, and the isolation degree is poor. In addition, when the symmetry of the symmetric-arm monopole antenna is poor, i.e., the feed arm is offset from the center of the radiating arm, the isolation between the two antennas is also poor because the ground current of the monopole antenna with the offset feed arm is no longer perpendicular to the ground current of the annular ground radiator antenna.
Example two:
the present embodiment is a modified embodiment of the first embodiment, and the technical solutions of the remaining portions are the same as the specific implementation manner of the first embodiment except that the following portions are different from the first embodiment, and the present embodiment specifically includes the following steps:
as shown in fig. 10, one end of the feed metal conduction band 33 in this embodiment is connected to the ground plane of the printed wiring board 1 through a capacitor 35, and the other end is vertically connected to the feed 31 located on the side of the clearance area 32 opposite to the edge of the printed wiring board 1; both ends of the ground metal conduction band 34 are connected to the printed wiring board 1, and a capacitor 36 is provided in the middle of the ground metal conduction band 34. Because the capacitor 36 is arranged in the middle of the grounding metal conduction band 34, the antenna has better symmetry, and the current vector distribution is more symmetrical and uniform, so that the isolation between the two antennas can be further improved. The desired resonant frequency can be achieved by adjusting the capacitor 36, and the desired resonant impedance can be achieved by adjusting the capacitor 35.
Example three:
the present embodiment is a modified embodiment of the first embodiment, and the technical solutions of the remaining portions are the same as the specific implementation manner of the first embodiment except that the following portions are different from the first embodiment, and the present embodiment specifically includes the following steps:
as shown in fig. 11, the feeding metal conduction band 33 in this embodiment is located inside the clearance area, one end of the feeding metal conduction band is connected to the feed 31 on the printed wiring board 1, the other end is vertically connected to one end of the grounding metal conduction band 34, an inductor 37 is provided in the middle of the feeding metal conduction band 33, and the other end of the grounding metal conduction band 34 is connected to the ground plane of the printed wiring board 1 through a capacitor 36. Where the capacitance 36 is a distributed capacitance, in other preferred embodiments, the distributed capacitance 36 may be replaced by a lumped capacitance. The inductance 37 may also be a lumped inductance or a distributed inductance, which may function as a feed shunt. The required resonant impedance can be achieved by adjusting the inductance 37 or adjusting the distance of the feed metal conduction band from the side of the clearance. Because the capacitor 36 is arranged in the middle of the grounding metal conduction band 34, the antenna has better symmetry, and the current vector distribution is more symmetrical and uniform, so that the isolation between the two antennas can be further improved. The desired resonant frequency can be achieved by adjusting the capacitor 36.
In other preferred embodiments, the structure of the circularly radiating antenna can be modified in other ways, for example, the metal conducting band can be a multi-branch metal conducting band structure, and the multi-branch metal conducting band structure can be connected with the non-clearance area of the printed circuit board through a capacitor as required to form a resonant loop of the antenna. The present invention is not limited to the various modifications of the metal conductive strip, and those skilled in the art should be able to make various modifications to the loop ground radiation antenna or the monopole antenna based on the solution of combining the loop ground radiation antenna with the monopole antenna to improve the isolation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to make modifications or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1.A compact high-isolation antenna is characterized by comprising a printed circuit board, wherein an annular ground radiation antenna is arranged on the printed circuit board, a monopole antenna is arranged above the annular ground radiation antenna, the annular ground radiation antenna comprises a clearance area arranged on the printed circuit board and a metal conduction band arranged in the clearance area and connected with a non-clearance area of the printed circuit board, the monopole antenna comprises a feed arm and a radiation arm, one end of the feed arm is connected with a first feed source of the printed circuit board, and the other end of the feed arm is connected with the radiation arm;
wherein the feed arm is positioned in a range above the printed circuit board corresponding to the clearance area;
the metal conduction band comprises a grounding metal conduction band and a feeding metal conduction band, and the grounding metal conduction band and the feeding metal conduction band are respectively connected with the ground plane of the printed circuit board;
the annular ground radiation antenna and the symmetric-arm monopole antenna are arranged at the edge of one side of the printed circuit board, and the annular ground radiation antenna is printed on the edge of the printed circuit board.
2. The compact, high-isolation antenna of claim 1, wherein the feed arm is located directly above a centerline of the clearance zone.
3. The compact high-isolation antenna according to claim 1, wherein the monopole antenna is a symmetric monopole antenna, the radiating arm is a symmetric radiating arm, and the other end of the feeding arm is connected to the middle of the symmetric radiating arm.
4. The compact, high-isolation antenna of claim 1, wherein said feed metal strip has one end connected to a ground plane of said printed wiring board via a first capacitor and another end directly connected to a second feed located on a side of said clearance area adjacent to an edge of said printed wiring board, and wherein said ground metal strip has one end connected to said ground plane of said printed wiring board via a second capacitor and another end directly connected to said printed wiring board.
5. The compact, high-isolation antenna of claim 1, wherein one end of the feed metal conduction band is connected to the ground plane of the printed wiring board through a first capacitor, and the other end is connected perpendicularly to a second feed located on the opposite side of the clearance area from the edge of the printed wiring board; two ends of the grounding metal conduction band are connected with the printed circuit board, and a second capacitor is arranged in the middle of the grounding metal conduction band.
6. The compact high-isolation antenna according to claim 1, wherein one end of the feeding metal conduction band is connected to the second feed source on the printed circuit board, and the other end of the feeding metal conduction band is vertically connected to one end of the grounding metal conduction band, an inductor is disposed in the middle of the feeding metal conduction band, and the other end of the grounding metal conduction band is connected to the ground plane of the printed circuit board through a capacitor.
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| CN201610784913.6A CN106252848B (en) | 2016-08-30 | 2016-08-30 | Compact high-isolation antenna |
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| CN201610784913.6A CN106252848B (en) | 2016-08-30 | 2016-08-30 | Compact high-isolation antenna |
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| CN106252848A CN106252848A (en) | 2016-12-21 |
| CN106252848B true CN106252848B (en) | 2020-01-10 |
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| CN107275781A (en) * | 2017-06-23 | 2017-10-20 | 曲龙跃 | A kind of separate type loop aerial for stacked conducting plate |
| CN112448163B (en) * | 2019-08-10 | 2024-06-11 | 深圳市卓睿通信技术有限公司 | High-isolation antenna pair and MIMO antenna system |
| CN112751155B (en) * | 2019-10-31 | 2022-04-05 | 华为技术有限公司 | Electronic device |
| CN115398742A (en) * | 2020-04-06 | 2022-11-25 | 华为技术有限公司 | Dual-mode antenna device |
| CN113540758B (en) * | 2020-04-22 | 2022-10-25 | 华为技术有限公司 | Antenna unit and electronic device |
| CN115706317A (en) * | 2021-08-12 | 2023-02-17 | 华为技术有限公司 | Antenna structure and electronic equipment |
| CN114447595B (en) * | 2022-01-13 | 2023-03-21 | 西安电子科技大学 | Double-port-ring antenna with zero clearance and high isolation characteristics and mobile terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1772930A4 (en) * | 2004-07-29 | 2009-10-28 | Panasonic Corp | Composite antenna device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102760949A (en) * | 2011-04-27 | 2012-10-31 | 鸿富锦精密工业（深圳）有限公司 | Multiple-input-and-output antenna |
| CN103187634B (en) * | 2013-03-27 | 2016-06-22 | 华南理工大学 | A kind of mimo antenna being made up of multiple beam antennas |
| CN103346397B (en) * | 2013-06-21 | 2016-01-13 | 上海安费诺永亿通讯电子有限公司 | Be applicable to the frequency antenna system with metal frame architecture mobile terminal |
| CN104795628A (en) * | 2015-04-07 | 2015-07-22 | 上海安费诺永亿通讯电子有限公司 | Terrestrial radiation antenna realizing double-frequency resonance by clearance of PCB (printed circuit board) |
| CN105322279A (en) * | 2015-12-01 | 2016-02-10 | 上海安费诺永亿通讯电子有限公司 | Broadband terrestrial radiation antenna and method for effectively improving bandwidth thereof |
| CN106058456B (en) * | 2016-08-12 | 2017-09-19 | 上海安费诺永亿通讯电子有限公司 | The high-isolation antenna and its MIMO communication system of compact excitation floor orthogonal radiation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1772930A4 (en) * | 2004-07-29 | 2009-10-28 | Panasonic Corp | Composite antenna device |
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