CN113036416A - Eight-unit MIMO antenna array with low SAR characteristic - Google Patents
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- 238000010586 diagram Methods 0.000 description 5
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
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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
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
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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
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
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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
- 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
- H01Q21/062—Two dimensional planar arrays using dipole aerials
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Abstract
The invention discloses an eight-unit MIMO antenna array with low SAR characteristics, which comprises a rectangular first dielectric substrate, a second dielectric substrate and a third dielectric substrate, wherein the second dielectric substrate and the third dielectric substrate are vertically arranged on two parallel edges of the first dielectric substrate; the second dielectric substrate is provided with symmetrically distributed antenna units Ant5-Ant 8; the third dielectric substrate is provided with symmetrically distributed antenna units Ant1-Ant4, and the second dielectric substrate and the third dielectric substrate are symmetrical about a plane of the axis of the first dielectric substrate. The invention provides an eight-unit MIMO antenna array with low SAR characteristics, which realizes that the antenna has the SAR characteristics far lower than the international standard when multiple antennas radiate simultaneously. The antenna array has good efficiency, isolation, envelope correlation coefficient and other performance parameters, and is suitable for 5G smart phones.
Description
Technical Field
The invention belongs to the field of antennas, and particularly relates to an eight-unit MIMO antenna array with a low SAR characteristic.
Background
To greatly improve data rate, channel capacity, and spectral efficiency. In order to avoid the harm of electromagnetic radiation generated from terminal devices such as mobile phones to human health, the international non-ionizing radiation protection committee (ICNIRP) and the Institute of Electrical and Electronics Engineers (IEEE) stipulate the limit of the Specific Absorption Rate (SAR) of mobile communication devices. SAR represents the electromagnetic power absorbed per unit mass of biological tissue. However, in the existing MIMO antenna design of the 5G smart phone, the research on SAR is few in the aspects of high isolation, multi-band, low profile and the like, and only the simulation result of SAR is given in relevant documents, and the reduction of SAR value is not taken as the key research content. Some documents analyze the influence of the type, the position, the floor size and the phase between two ports of the antenna on the SAR value, but the conclusions are drawn based on specific research objects, have no generality and have little guiding significance on the design of the low-SAR-value MIMO mobile phone antenna. There are also documents that propose to reduce the SAR value by interposing a layer of material between the antenna and the head, such as a conductive plate, ferrite, etc., which can be used to reflect or absorb the electromagnetic radiation of the antenna towards the head; or a High Impedance Surface (HIS), Electromagnetic Band Gap (EBG) structure, etc., which suppresses the propagation of surface currents and thus reduces electromagnetic radiation towards the human head. However, these solutions are not practical because the mainstream design of the current mobile phone has the features of full screen and ultra-thin, the size of the insertion layer is usually too large for practical application, and its effective bandwidth is usually narrower than the working frequency band of the mobile phone.
Disclosure of Invention
The eight-unit MIMO antenna array with the low SAR characteristic realizes the eight-unit antenna array with the low SAR characteristic, and has an SAR value far lower than the international standard.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: an eight-unit MIMO antenna array with low SAR characteristics comprises a rectangular first dielectric substrate, a second dielectric substrate and a third dielectric substrate, wherein the second dielectric substrate and the third dielectric substrate are vertically arranged on two parallel edges of the first dielectric substrate;
the antenna units Ant5-Ant8 are symmetrically distributed on the second dielectric substrate, and the antenna units Ant5-Ant6 and the antenna units Ant7-Ant8 are symmetrical about the axis of the second dielectric substrate; the third dielectric substrate is provided with symmetrically distributed antenna units Ant1-Ant4, and the antenna units Ant1-Ant2 and the antenna units Ant3-Ant4 are symmetrical around the axis of the third dielectric substrate; distances between the antenna unit Ant1 and the antenna unit Ant2, between the antenna unit Ant3 and the antenna unit Ant4, between the antenna unit Ant5 and the antenna unit Ant6, and between the antenna unit Ant7 and the antenna unit Ant8 are d; the distance between the antenna unit Ant2 and the antenna unit Ant3 and between the antenna unit Ant6 and the antenna unit Ant7 is L; the second dielectric substrate and the third dielectric substrate are symmetrical about a plane of the first dielectric substrate axis.
Further, the size of the first dielectric substrate is 154mm × 74mm × 0.8mm, the sizes of the second dielectric substrate and the third dielectric substrate are 144mm × 6.7mm × 0.8mm, d is 11mm, and L is 13.2 mm.
Further, the first dielectric substrate is divided into a first reserved area, a bottom plate and a second reserved area, the first reserved area and the second reserved area are distributed on two sides of the bottom plate, the size of each reserved area is 74mm multiplied by 5mm, the size of the bottom plate is 144mm multiplied by 74mm, and the second dielectric substrate and the third dielectric substrate are arranged on the bottom plate.
Furthermore, the materials adopted by the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are all FR4 materials.
Furthermore, the antenna units Ant1-Ant8 have the same structure and each include a dipole radiator, a T-shaped feed structure, a bump structure and a microstrip line; the dipole radiator is of a square structure with a notch, the notch is arranged on the axis of the dipole radiator, and the dipole radiator is symmetrical about the axis; the side of the dipole radiator opposite to the notch is an antenna AA', the side of the dipole radiator without the notch and connected with the point A is an antenna AB, and the antenna from the point B to the notch on the dipole radiator is a BH; the antenna BH is provided with 5 bending points, wherein the 5 bending points are respectively a point C, a point D, a point E, a point F and a point G; the antennas from the point B to the point C, from the point D to the point E and from the point F to the point G are parallel, and the antennas from the point C to the point D, from the point E to the point F and from the point G to the point H are parallel and equal in length;
the antenna MN consisting of two end points of the T-shaped feed structure is arranged in the middle of the antenna AA', and the axis of the antenna MN is superposed with the axis of the dipole radiator; and a convex structure is further arranged in the middle of the antenna AA ', the third end of the T-shaped feed structure is connected with one end L of the microstrip line, and the other end L' of the microstrip line is an input/output connection end of the antenna unit.
Further, the size of the dipole radiator is 23.2mm × 5.6mm, the size of the antenna AA' is 23.2mm × 1mm, the size of the antenna AB is 5.6 × 0.8mm, the size of the antenna BC is 3.75 mm × 1.5mm, the size of the antenna CD is 3mm × 0.3mm, the size of the antenna DE is 4.1mm × 0.5mm, the size of the antenna EF is 3mm × 0.3mm, the size of the antenna FG is 3.65mm × 1.5mm, and the size of the antenna GH is 3mm × 0.7 mm; the size of the protruding structure is 6mm multiplied by 0.6mm, the two ends of the protruding structure are provided with a point I and a point J, and an antenna IJ is parallel to an antenna AA'; the size of the antenna MN is 7mm multiplied by 1.2mm, and the size of the microstrip line is 5mm multiplied by 1.5 mm.
The invention has the beneficial effects that:
(1) the invention provides an eight-unit MIMO antenna array with low SAR characteristics, which realizes that the antenna has the SAR characteristics far lower than the international standard when multiple antennas radiate simultaneously.
(2) The antenna array has good efficiency, isolation, envelope correlation coefficient and other performance parameters, and is suitable for 5G smart phones.
(3) The invention has simple layout, easy production, large-scale production and use, good application prospect and provides the 5G MIMO smart phone antenna array with low SAR.
Drawings
Fig. 1 is an eight-element MIMO antenna array with low SAR characteristics, wherein fig. 1(a) is a schematic diagram of the structure and size of the eight-element MIMO antenna array, fig. 1(b) is a schematic diagram of the side view of the eight-element MIMO antenna array, and fig. 1(c) is a schematic diagram of the structure and size of the antenna element.
Fig. 2(a) is a diagram showing simulation results of S-parameters of the antenna elements Ant1 to Ant6 in the present invention, and fig. 2(b) is a diagram showing simulation results of efficiencies of the antenna elements Ant1 to Ant2 in the present invention.
Fig. 3 is a graph of the test result of the Envelope Correlation Coefficient (ECC) of an eight-element MIMO antenna array with low SAR characteristics according to the present invention.
Wherein: the antenna comprises a first dielectric substrate 1, a second dielectric substrate 2, a third dielectric substrate 3, a 4-dipole radiator, a 5-T-shaped feed structure, a 6-bump structure and a 7-microstrip line.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1(a) to 1(c), an eight-element MIMO antenna array with low SAR characteristics comprises a rectangular first dielectric substrate 1, and a second dielectric substrate 2 and a third dielectric substrate 3 vertically disposed on two parallel sides of the first dielectric substrate 1;
the antenna units Ant5-Ant8 are symmetrically distributed on the second dielectric substrate 2, and the antenna units Ant5-Ant6 and the antenna units Ant7-Ant8 are symmetrical about the axis of the second dielectric substrate 2; the third dielectric substrate 3 is provided with symmetrically distributed antenna units Ant1-Ant4, and the antenna units Ant1-Ant2 and the antenna units Ant3-Ant4 are symmetrical with respect to the axis of the third dielectric substrate 3; distances between the antenna unit Ant1 and the antenna unit Ant2, between the antenna unit Ant3 and the antenna unit Ant4, between the antenna unit Ant5 and the antenna unit Ant6, and between the antenna unit Ant7 and the antenna unit Ant8 are d; the distance between the antenna unit Ant2 and the antenna unit Ant3 and between the antenna unit Ant6 and the antenna unit Ant7 is L; the second dielectric substrate 2 and the third dielectric substrate 3 are symmetrical about the plane of the axis of the first dielectric substrate 1.
The first dielectric substrate 1 is 154mm × 74mm × 0.8mm, the second dielectric substrate 2 and the third dielectric substrate 3 are 144mm × 6.7mm × 0.8mm, d is 11mm, and L is 13.2 mm.
The first dielectric substrate 1 is divided into a first reserved area, a bottom plate and a second reserved area, the first reserved area and the second reserved area are distributed on two sides of the bottom plate and are 74mm multiplied by 5mm in size, the bottom plate is 144mm multiplied by 74mm in size, and the second dielectric substrate 2 and the third dielectric substrate 3 are arranged on the bottom plate.
The materials adopted by the first dielectric substrate 1, the second dielectric substrate 2 and the third dielectric substrate 3 are all FR4 materials.
The antenna units Ant1-Ant8 have the same structure and respectively comprise a dipole radiator 4, a T-shaped feed structure 5, a convex structure 6 and a microstrip line 7; the dipole radiator 4 is of a square structure with a gap, the gap is arranged on the axis of the dipole radiator 4, and the dipole radiator 4 is symmetrical about the axis; the side of the dipole radiator 4 opposite to the notch is an antenna AA', the side of the dipole radiator 4 without the notch and connected with the point A is an antenna AB, and the antenna from the point B to the notch on the dipole radiator 4 is a antenna BH; the antenna BH is provided with 5 bending points, wherein the 5 bending points are respectively a point C, a point D, a point E, a point F and a point G; the antennas from the point B to the point C, from the point D to the point E and from the point F to the point G are parallel, and the antennas from the point C to the point D, from the point E to the point F and from the point G to the point H are parallel and equal in length;
the antenna MN formed by two end points of the T-shaped feed structure 5 is arranged in the middle of the antenna AA', and the axis of the antenna MN is superposed with the axis of the dipole radiator 4; the middle position of the antenna AA 'is also provided with a convex structure 6, the third end of the T-shaped feed structure 5 is connected with one end L of a microstrip line 7, and the other end L' of the microstrip line 7 is an input/output connecting end of the antenna unit.
The size of the dipole radiator 4 is 23.2mm × 5.6mm, the size of the antenna AA' is 23.2mm × 1mm, the size of the antenna AB is 5.6 × 0.8mm, the size of the antenna BC is 3.75 mm × 1.5mm, the size of the antenna CD is 3mm × 0.3mm, the size of the antenna DE is 4.1mm × 0.5mm, the size of the antenna EF is 3mm × 0.3mm, the size of the antenna FG is 3.65mm × 1.5mm, and the size of the antenna GH is 3mm × 0.7 mm; the size of the protruding structure 6 is 6mm multiplied by 0.6mm, the two ends of the protruding structure are provided with a point I and a point J, and an antenna IJ is parallel to an antenna AA'; the size of the antenna MN is 7mm multiplied by 1.2mm, and the size of the microstrip line 7 is 5mm multiplied by 1.5 mm.
As shown in fig. 2, simulation results of S-parameters and antenna efficiency of an eight-element MIMO antenna array with low SAR characteristics are given only for antenna elements Ant1 through Ant6 for the sake of brevity since the antennas are symmetrically distributed. As can be seen from FIG. 2, the-6 dB impedance bandwidths of the antenna Ant1 and the antenna Ant2 can completely cover 3400-3600MHz, the isolation is greater than 15dB, and the efficiency of the antenna is 50% -70%.
As shown in fig. 3, a test result of envelope correlation coefficient ECC of an eight-element MIMO antenna array with low SAR characteristics is obtained from a composite field of the test, and it can be seen that the ECC of an antenna port in a desired frequency band is less than 0.1, which completely meets the actual requirements of a smart phone.
In addition, when the SAR value of the eight-unit MIMO antenna array provided by the invention is used for carrying out simulation test, the maximum value of head SAR of the eight-unit MIMO antenna array is 0.63W/kg and the maximum value of Body SAR of the eight-unit MIMO antenna array is 0.28W/kg when the eight-unit MIMO antenna is radiated simultaneously, which is far lower than the international index.
Claims (6)
1. An eight-unit MIMO antenna array with low SAR characteristic is characterized by comprising a first rectangular dielectric substrate (1), a second dielectric substrate (2) and a third dielectric substrate (3), wherein the second dielectric substrate and the third dielectric substrate are vertically arranged on two parallel sides of the first dielectric substrate (1);
the antenna units Ant5-Ant8 are symmetrically distributed on the second dielectric substrate (2), and the antenna units Ant5-Ant6 and the antenna units Ant7-Ant8 are symmetrical about the axis of the second dielectric substrate (2); the third dielectric substrate (3) is provided with symmetrically distributed antenna units Ant1-Ant4, and the antenna units Ant1-Ant2 and the antenna units Ant3-Ant4 are symmetrical about the axis of the third dielectric substrate (3); distances between the antenna unit Ant1 and the antenna unit Ant2, between the antenna unit Ant3 and the antenna unit Ant4, between the antenna unit Ant5 and the antenna unit Ant6, and between the antenna unit Ant7 and the antenna unit Ant8 are d; the distance between the antenna unit Ant2 and the antenna unit Ant3 and between the antenna unit Ant6 and the antenna unit Ant7 is L; the second dielectric substrate (2) and the third dielectric substrate (3) are symmetrical about the plane of the axis of the first dielectric substrate (1).
2. The eight-element MIMO antenna array with low SAR characteristics of claim 1, wherein said first dielectric substrate (1) has dimensions of 154mm x 74mm x 0.8mm, said second dielectric substrate (2) and third dielectric substrate (3) each have dimensions of 144mm x 6.7mm x 0.8mm, said d is 11mm, and said L is 13.2 mm.
3. The eight-element MIMO antenna array with low SAR characteristics of claim 1, wherein the first dielectric substrate (1) is divided into a first reserved area, a bottom plate and a second reserved area, the first reserved area and the second reserved area are distributed on both sides of the bottom plate and both have a size of 74mm x 5mm, the size of the bottom plate is 144mm x 74mm, and the second dielectric substrate (2) and the third dielectric substrate (3) are disposed on the bottom plate.
4. The eight-element MIMO antenna array with low SAR characteristic as claimed in claim 1, wherein the materials adopted by the first dielectric substrate (1), the second dielectric substrate (2) and the third dielectric substrate (3) are all FR4 materials.
5. The eight-element MIMO antenna array with low SAR characteristics of claim 1, wherein said antenna elements Ant1-Ant8 are structurally identical, each comprising a dipole radiator (4), a T-feed structure (5), a raised structure (6) and a microstrip line (7); the dipole radiating body (4) is of a square structure with a gap, the gap is arranged on the axis of the dipole radiating body (4), and the dipole radiating body (4) is symmetrical about the axis; the side, opposite to the notch, of the dipole radiating body (4) is an antenna AA', the side, without the notch, of the dipole radiating body (4) connected with the point A is an antenna AB, and the side, from the point B to the notch, of the dipole radiating body (4) is an antenna BH; the antenna BH is provided with 5 bending points, wherein the 5 bending points are respectively a point C, a point D, a point E, a point F and a point G; the antennas from the point B to the point C, from the point D to the point E and from the point F to the point G are parallel, and the antennas from the point C to the point D, from the point E to the point F and from the point G to the point H are parallel and equal in length;
an antenna MN consisting of two end points of the T-shaped feed structure (5) is arranged in the middle of the antenna AA', and the axis of the antenna MN is superposed with the axis of the dipole radiator (4); and a convex structure (6) is further arranged in the middle of the antenna AA ', the third end of the T-shaped feed structure (5) is connected with one end L of the microstrip line (7), and the other end L' of the microstrip line (7) is an input/output connecting end of the antenna unit.
6. The eight-element MIMO antenna array with low SAR characteristics as claimed in claim 5, wherein the dipole radiator (4) has a size of 23.2mm x 5.6mm, the antenna AA' has a size of 23.2mm x 1mm, the antenna AB has a size of 5.6 x 0.8mm, the antenna BC has a size of 3.75m x 1.5mm, the antenna CD has a size of 3mm x 0.3mm, the antenna DE has a size of 4.1mm x 0.5mm, the antenna EF has a size of 3mm x 0.3mm, the antenna FG has a size of 3.65mm x 1.5mm, and the antenna GH has a size of 3mm x 0.7 mm; the size of the protruding structure (6) is 6mm multiplied by 0.6mm, the two ends of the protruding structure are provided with a point I and a point J, and an antenna IJ is parallel to an antenna AA'; the size of the antenna MN is 7mm multiplied by 1.2mm, and the size of the microstrip line (7) is 5mm multiplied by 1.5 mm.
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| CN202110264901.1A CN113036416B (en) | 2021-03-11 | 2021-03-11 | Eight-unit MIMO antenna array with low SAR characteristic |
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| CN202110264901.1A CN113036416B (en) | 2021-03-11 | 2021-03-11 | Eight-unit MIMO antenna array with low SAR characteristic |
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